[security-alerts] FW: [SA24373] ModSecurity POST Data NULL Byte Rule Bypass

["Kazennov, Vladimir" <Vladimir.Kazennov@xxxxxxxxxx>]

> ----------------------------------------------------------------------
> 
> 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
>