WordPress: Arbitrary command execution

Background

WordPress is a PHP and MySQL based content management and publishing system.

Description

rgod discovered that WordPress insufficiently checks the format of cached username data.

Impact

An attacker could exploit this vulnerability to execute arbitrary commands by sending a specially crafted username. As of Wordpress 2.0.2 the user data cache is disabled by default.

Workaround

There are no known workarounds at this time.

Resolution

All WordPress users should upgrade to the latest available version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-apps/wordpress-2.0.3"