Home page logo
/

fulldisclosure logo Full Disclosure mailing list archives

Executing arbitrary PHP code on OpenX <= 2.8.1
From: Moritz Naumann <security () moritz-naumann com>
Date: Tue, 24 Nov 2009 12:02:18 +0100

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Hi,

OpenX adserver version 2.8.1 and lower is vulnerable to remote code
execution. To be exploited, this vulnerability requires banner / file
upload permissions, such as granted to the 'advertiser' and
'administrator' roles.

This vulnerability is caused by the (insecure) file upload mechanism of
affected OpenX versions. These would check magic bytes of an uploaded
file to determine its MIME type, and erroneously assume this
information to be reliable. Additionally, while the file name of
uploaded files is changed, the file extension is not.

As such, it is possible to upload image files with embedded PHP code and
.php file extension. Unless PHP script execution is explicitly prevented
for the file upload location (which has not been documented in the OpenX
manual so far and it is not the result of a default installation), the
PHP code will execute as soon as HTTP access to the file location will
cause it to be executed by the web server.

To clarify, an attacker exploiting this security issue does require
prior access to OpenX, i.e. exploitation is only possible after
successful authentication. On the other hand, advertiser access is a
rather low permission level and should not allow for system access.

If these bugs were not hidden from OpenX' bug tracker, you could read up
more about issue X-5747 here:
https://developer.openx.org/jira/browse/OX/fixforversion/10910

OpenX 2.8.2 has already been released in October to fix this issue and
can be downloaded from
http://www.openx.org/ad-server/download

Moritz Naumann
Naumann IT Security Consulting
Berlin, Germany

http://www.moritz-naumann.com/

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)

iEYEAREKAAYFAksLvToACgkQn6GkvSd/BgxufgCfb27dD4mvPfnOa6YEthKNRzrm
C7YAnieGtdnqtzBO28zThXHHy/WnCeHG
=3R3Y
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/


  By Date           By Thread  

Current thread:
  • Executing arbitrary PHP code on OpenX <= 2.8.1 Moritz Naumann (Nov 24)
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault