Subject: [ GLSA 200907-02 ] ModSecurity: Denial of Service
From: Alex Legler <a3li@gentoo.org.>
To: gentoo-announce@gentoo.org
Cc: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
security-alerts@linuxsecurity.com
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Date: Thu, 02 Jul 2009 21:38:32 +0200
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Gentoo Linux Security Advisory GLSA 200907-02
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http://security.gentoo.org/
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Severity: Normal
Title: ModSecurity: Denial of Service
Date: July 02, 2009
Bugs: #262302
ID: 200907-02
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Synopsis
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Two vulnerabilities in ModSecurity might lead to a Denial of Service.
Background
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ModSecurity is a popular web application firewall for the Apache HTTP
server.
Affected packages
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Package / Vulnerable / Unaffected
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1 www-apache/mod_security < 2.5.9 >=3D 2.5.9
Description
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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
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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
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There is no known workaround at this time.
Resolution
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All ModSecurity users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dwww-apache/mod_security-2.5.9"
References
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[ 1 ] CVE-2009-1902
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1902
[ 2 ] CVE-2009-1903
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1903
Availability
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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?
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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
http://bugs.gentoo.org.
License
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Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
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