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[SA11138] mod_security POST Request Processing Off-By-One Vulnerability

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Mar 17 2004 - 02:41:46 CST

TITLE:
mod_security POST Request Processing Off-By-One Vulnerability

SECUNIA ADVISORY ID:
SA11138

VERIFY ADVISORY:
http://secunia.com/advisories/11138/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
From remote

SOFTWARE:
mod_security 1.7.x

DESCRIPTION:
Evgeny Legerov has discovered a vulnerability in mod_security, which
can be exploited by malicious people to cause a DoS
(Denial-of-Service) and potentially compromise a vulnerable system.

The vulnerability is reportedly caused due to an off-by-one error
within the handling of POST payloads when the "SecFilterScanPost"
directive is enabled.

Successful exploitation will cause web server instances to crash but
may potentially also allow execution of arbitrary code. However, this
hasn't been confirmed.

The vulnerability has been reported in version 1.7.4 combined with
the Apache 2.x branch.

SOLUTION:
Update to version 1.7.5.
http://modsecurity.org/download/index.html

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov, S-Quadra.

ORIGINAL ADVISORY:
http://www.s-quadra.com/advisories/Adv-20040315.txt

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