vTiger CRM 5.2.x <= Remote Code Execution Vulnerability

By YGN Ethical Hacker Group - 
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]

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