foobarwp12 has reported a security issue in WordPress, which potentially can be exploited by malicious people to cause a DoS (Denial of Service).
The security issue is caused due to WordPress not verifying pingback URLs or limiting the maximum size of files to be downloaded during the pingback process. This can be exploited to cause high bandwidth usage by sending multiple pingbacks containing URLs to large files.
The security issue is confirmed in version 2.1.3. Other versions may also be affected.
Solution: Edit the source code to ensure that pingback URLs are properly verified and no large files can be downloaded.
Provided and/or discovered by: Reported in a WordPress bug by foobarwp12. Also reported by Blake Matheny.
Original Advisory: http://trac.wordpress.org/ticket/4137
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Subject: WordPress Pingback Denial of Service Security Issue
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