GLSA 200907-02: ModSecurity: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	ModSecurity: Denial of Service
Date:	07/02/2009
Bugs:	#262302
ID:	200907-02

Synopsis

Two vulnerabilities in ModSecurity might lead to a Denial of Service.

Background

ModSecurity is a popular web application firewall for the Apache HTTP server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
www-apache/mod_security	< 2.5.9	>= 2.5.9	All supported architectures

Description

Multiple vulnerabilities were discovered in ModSecurity:

Juan Galiana Lara of ISecAuditors discovered a NULL pointer dereference when processing multipart requests without a part header name (CVE-2009-1902).
Steve Grubb of Red Hat reported that the "PDF XSS protection" feature does not properly handle HTTP requests to a PDF file that do not use the GET method (CVE-2009-1903).

Impact

A remote attacker might send requests containing specially crafted multipart data or send certain requests to access a PDF file, possibly resulting in a Denial of Service (crash) of the Apache HTTP daemon. NOTE: The PDF XSS protection is not enabled by default.

Workaround

There is no known workaround at this time.

Resolution

All ModSecurity users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-apache/mod_security-2.5.9"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200907-02.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.