Alexander Concha has discovered a vulnerability in WordPress and WordPress MU, which can be exploited by malicious users to bypass certain security restrictions and to compromise a vulnerable system.
The vulnerability is caused due to improper authentication verification. This can be exploited to add the custom field "_wp_attached_file" to a post, upload a PHP script to an arbitrary path with wp-app.php or app.php, and execute arbitrary PHP code.
Successful exploitation requires valid Editor credentials and that the system is configured to allow uploads.
The vulnerability is confirmed in WordPress 2.2 and reported in WordPress MU 1.2.2. Prior versions may also be affected.
Solution: Update to WordPress 2.2.1 or WordPress MU 1.2.3.
Provided and/or discovered by: Alexander Concha
Original Advisory: http://www.buayacorp.com/files/wordpress/wordpress-advisory.html
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Subject: WordPress Custom Field PHP Script Upload
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