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WordPress MU < 2.6 wpmu-blogs.php Crose Site Scrpting vulnerability
From: Juan Galiana <jgaliana () gmail com>
Date: Mon, 29 Sep 2008 23:35:26 +0200

Hash: SHA1

 - Security Advisory -

- - WordPress MU < 2.6 wpmu-blogs.php Crose Site Scrpting vulnerability -
- -----------------------------------------------------------------------

Product: Wordpress-MU (multi-user)
Version: Versions prior to 2.6 are affected
Url: http://mu.wordpress.org
Affected by: Coss Site Scripting Attack

I. Introduction.

Wordpress-MU, or multi-user, allows to run unlimited blogs with a
single install of wordpress. It's widely used, some examples are
WordPress.com or universities like Harvard

II. Description and Impact

Wordpress-MU is affected by a Cross Site Scripting vulnerability, an
attacker can perform an XSS attack that allows him to access the
targeted user cookies to gain administrator privileges

In /wp-admin/wpmu-blogs.php an attacker can inject javascript code,
the input variables "s" and "ip_address" of GET method aren't properly

Here is a poc:

PoC: http://site/path/wp-admin/wpmu-blogs.php?action=blogs&s=%27[XSS]

The impact is the attacker can gain administrator privileges on the

III. Timeline

May 14th, 2008       - Bug discovered
May 14th, 2008       - Vendor contacted and the start of a syncronized
code patching
May 16th, 2008       - MU trunk code fixed
July 28th, 2008      - WPMU 2.6 released
September 2nd, 2008  - WPMU 2.6.1 released
September 29th, 2008 - Security advisory released

IV. Solution

Upgrade to version 2.6 or upper of wordpress multi-user. It can be
downloaded from http://mu.wordpress.org

V. Credits

Juan Galiana Lara
<jgaliana gmail com>
Version: GnuPG v1.4.6 (Darwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org


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