Secunia

Stefan Esser has discovered a vulnerability in ModSecurity, which can be exploited by malicious people to bypass certain security restrictions.

The problem is that it is possible to bypass rules by adding NULL bytes to POST data with the application/x-www-form-urlencoded media type.

The vulnerability is confirmed in version 2.1.0. Other versions may also be affected.

Solution
Update to version 2.1.1.
Further details available in Customer Area

Provided and/or discovered by
Stefan Esser, Hardened-PHP Project.

Changelog
Further details available in Customer Area

Original Advisory
http://www.modsecurity.org/blog/archives/2007/03/modsecurity_asc.html

MOPB:
http://www.php-security.org/MOPB/BONUS-12-2007.html

Deep Links
Links available in Customer Area