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OS Commerce Bypass / Command Execution

OS Commerce Bypass / Command Execution
Posted Nov 18, 2009
Authored by Stuart Udall

OS Commerce version 2.2RC2 suffers from an administrative bypass vulnerability allowing for command execution.

tags | exploit, bypass
SHA-256 | 7e6cbe5179e855a24226db6d3b8f8c7a251760822041daf1adcd9bfb00d6c0c7

OS Commerce Bypass / Command Execution

Change Mirror Download
OS Commerce authentication bypass

Description: Accessing administration pages should give a login
screen to unauthenticated users, however instead, data is displayed,
and administrative commands can be executed. Apparently any page in
the admin directory can be accessed in this way (including file
manager and email functionality).

Exploit: http://www.victim.com/catalog/admin/orders.php/login.php

Exploit detection: search webserver logs for ".php/" (with no quotes)
- there should be no results. Sample of malicious traffic:

1.2.3.4 - - [04/Nov/2009:19:46:29 +0000] "POST
/catalog/admin/file_manager.php/login.php?action=processuploads
HTTP/1.1" 302 5 "-" "User-Agent: Googlebot 2.1"

Workarounds: Secure the /admin folder with .htaccess-based
authentication. Hosting providers can add detection of exploit
strings to their IDS. A rewrite rule might also be used to detect
and reject incoming requests containing exploit strings.

Patch: no official patches known

Affected versions: OS Commerce 2.2RC2 - maybe others (untested)

Threat distribution: being used in the wild, possibly by bots

References:

http://forums.oscommerce.com/topic/348589-serious-hole-found-in-oscommerce
http://www.powersellersunite.com/post-283818.html
http://forums.oscommerce.com/topic/345957-evalbase64-decode-hack/

This is not the CSRF issue CVE-2009-0408 as there is no CSRF used in
the above attack. Vulnerability #2 at
http://secunia.com/advisories/33446/ (recently added) seems to be it,
but I don't see why it's lumped in with the CSRF flaw...

Stu

---
Stuart Udall
stuart at@cyberdelix.dot net - http://www.cyberdelix.net/

---
* Origin: lsi: revolution through evolution (192:168/0.2)

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