AusCERT - ESB-2013.0519 - [Win][UNIX/Linux][Debian] libapache-mod-security: Denial of service

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ESB-2013.0519 - [Win][UNIX/Linux][Debian] libapache-mod-security: Denial of service - Remote with user interaction
Date: 11 April 2013

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0519
                  libapache-mod-security security update
                               11 April 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libapache-mod-security
Publisher:         Debian
Operating System:  Debian GNU/Linux 6
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service        -- Remote with User Interaction
                   Access Confidential Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-1915  

Original Bulletin: 
   http://www.debian.org/security/2013/dsa-2659

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running libapache-mod-security check for an updated version of the 
         software for their operating system.

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- - -------------------------------------------------------------------------
Debian Security Advisory DSA-2659-1                   security@debian.org
http://www.debian.org/security/                      Salvatore Bonaccorso
April 09, 2013                         http://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : libapache-mod-security
Vulnerability  : XML external entity processing vulnerability
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2013-1915
Debian Bug     : 704625

Timur Yunusov and Alexey Osipov from Positive Technologies discovered
that the XML files parser of ModSecurity, an Apache module whose purpose
is to tighten the Web application security, is vulnerable to XML
external entities attacks. A specially-crafted XML file provided by a
remote attacker, could lead to local file disclosure or excessive
resources (CPU, memory) consumption when processed.

This update introduces a SecXmlExternalEntity option which is 'Off' by
default.  This will disable the ability of libxml2 to load external
entities.

For the stable distribution (squeeze), this problem has been fixed in
version 2.5.12-1+squeeze2.

For the testing distribution (wheezy), this problem has been fixed in
version 2.6.6-6 of the modsecurity-apache package.

For the unstable distribution (sid), this problem has been fixed in
version 2.6.6-6 of the modsecurity-package package.

We recommend that you upgrade your libapache-mod-security packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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===========================================================================
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