bugtraq - vTiger CRM 5.2.x <= Remote Code Execution Vulnerability

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Date: Wed, 5 Oct 2011 18:02:30 +0800
From: YGN Ethical Hacker Group <lists@...g.net>
To: full-disclosure <full-disclosure@...ts.grok.org.uk>,
  bugtraq <bugtraq@...urityfocus.com>, secalert@...urityreason.com,
  bugs@...uritytracker.com, vuln <vuln@...unia.com>, vuln@...urity.nnov.ru,
  news@...uriteam.com, moderators@...db.org,
  submissions@...ketstormsecurity.org
Subject: vTiger CRM 5.2.x <= Remote Code Execution Vulnerability

vTiger CRM 5.2.x <= Remote Code Execution Vulnerability

1. OVERVIEW

The vTiger CRM 5.2.1 and lower versions are vulnerable to Remote Code
Execution. No fixed version has been released as of 2011-10-05.

2. BACKGROUND

vtiger CRM is a free, full-featured, 100% Open Source CRM software
ideal for small and medium businesses, with low-cost product support
available to production users that need reliable support. vtiger CRM
is a widely used product with thousands of users in dozens of
countries.  It has a vibrant community of users driving the product
forward, and contributing to it's development.  Over 2 million copies
of vtiger CRM have been downloaded so far. It was launched as a fork
of version 1.0 of the SugarCRM project launched on December 31st,
2004.

3. VULNERABILITY DESCRIPTION

vTiger uses the vulnerable version of phpmailer class file located at
/cron/class.phpmailer.php .

4. VERSIONS AFFECTED

Tested on 5.2.1

5. PROOF-OF-CONCEPT/EXPLOIT

File: /cron/class.phpmailer.php
[code]

391:    function SendmailSend($header, $body) {
392:	if ($this->Sender != "")
393:       $sendmail = sprintf("%s -oi -f %s -t", $this->Sendmail,
$this->Sender);
394:    else
395:       $sendmail = sprintf("%s -oi -t", $this->Sendmail);

[/code]

6. SOLUTION

The vendor hasn't attempted to incorporate the latest version of
phpMailer class in their vTigerCRM as of version 5.2.1.

The flawed code portion can be patched with:

393: $sendmail = sprintf("%s -oi -f %s -t",
escapeshellcmd($this->Sendmail), escapeshellarg($this->Sender));
395: $sendmail = sprintf("%s -oi -t", escapeshellcmd($this->Sendmail));

7. VENDOR

vTiger Development Team
http://www.vtiger.com/

8. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN
Ethical Hacker Group, Myanmar.

9. DISCLOSURE TIME-LINE

2010-12-08: notified vendor
2011-10-05: no fixed version released yet
2011-10-05: vulnerability disclosed

10. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/%5BvTiger_5.2.1%5D_rce
Wiki VtigerCRM: https://secure.wikimedia.org/wikipedia/en/wiki/Vtiger_CRM
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3215

#yehg [2011-10-05]