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libxml2: Multiple vulnerabilities



libxml2: Multiple vulnerabilities
libxml2: Multiple vulnerabilities



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Gentoo Linux Security Advisory                           GLSA 200812-06
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: libxml2: Multiple vulnerabilities
      Date: December 02, 2008
      Bugs: #234099, #237806, #239346, #245960
        ID: 200812-06

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Synopsis
=======
Multiple vulnerabilities in libxml2 might lead to execution of
arbitrary code or Denial of Service.

Background
=========
libxml2 is the XML (eXtended Markup Language) C parser and toolkit
initially developed for the Gnome project.

Affected packages
================
    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libxml2     < 2.7.2-r1                       >= 2.7.2-r1

Description
==========
Multiple vulnerabilities were reported in libxml2:

* Andreas Solberg reported that libxml2 does not properly detect
  recursion during entity expansion in an attribute value
  (CVE-2008-3281).

* A heap-based buffer overflow has been reported in the
  xmlParseAttValueComplex() function in parser.c (CVE-2008-3529).

* Christian Weiske reported that predefined entity definitions in
  entities are not properly handled (CVE-2008-4409).

* Drew Yao of Apple Product Security reported an integer overflow in
  the xmlBufferResize() function that can lead to an infinite loop
  (CVE-2008-4225).

* Drew Yao of Apple Product Security reported an integer overflow in
  the xmlSAX2Characters() function leading to a memory corruption
  (CVE-2008-4226).

Impact
=====
A remote attacker could entice a user or automated system to open a
specially crafted XML document with an application using libxml2,
possibly resulting in the exeution of arbitrary code or a high CPU and
memory consumption.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All libxml2 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/libxml2-2.7.2-r1"

References
=========
  [ 1 ] CVE-2008-3281
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3281 
  [ 2 ] CVE-2008-3529
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3529 
  [ 3 ] CVE-2008-4409
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4409 
  [ 4 ] CVE-2008-4225
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4225 
  [ 5 ] CVE-2008-4226
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4226 

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200812-06.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 
http://bugs.gentoo.org. 

License
======
Copyright 2008 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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