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TITLE:
ModSecurity POST Data NULL Byte Rule Bypass

SECUNIA ADVISORY ID:
SA24373

VERIFY ADVISORY:
http://secunia.com/advisories/24373/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
ModSecurity 2.x
http://secunia.com/product/13609/

DESCRIPTION:
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:
Do not rely solely on ModSecurity to block attacks.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser, Hardened-PHP Project.

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

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