Gentoo: libarchive (formerly named as bsdtar) Multiple pax Extension Header Vulnerabilities
Posted by Benjamin D. Thomas   
Gentoo Multiple vulnerabilities were found in libarchive (formerly named as app-archive/bsdtar), possibly allowing for the execution of arbitrary code or a Denial of Service. CPNI, CERT-FI, Tim Kientzle, and Colin Percival reported a buffer overflow (CVE-2007-3641), an infinite loop (CVE-2007-3644), and a NULL pointer dereference (CVE-2007-3645) within the processing of archives having corrupted PaX extension headers.
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Gentoo Linux Security Advisory                           GLSA 200708-03
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libarchive (formerly named as bsdtar): Multiple pax
            Extension Header Vulnerabilities
      Date: August 08, 2007
      Bugs: #184984
        ID: 200708-03

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Synopsis
========

Multiple vulnerabilities were found in libarchive (formerly named as
app-archive/bsdtar), possibly allowing for the execution of arbitrary
code or a Denial of Service.

Background
==========

libarchive is a library for manipulating different streaming archive
formats, including certain tar variants, several cpio formats, and both
BSD and GNU ar variants.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  app-arch/libarchive       < 2.2.4                        >= 2.2.4

Description
===========

CPNI, CERT-FI, Tim Kientzle, and Colin Percival reported a buffer
overflow (CVE-2007-3641), an infinite loop (CVE-2007-3644), and a NULL
pointer dereference (CVE-2007-3645) within the processing of archives
having corrupted PaX extension headers.

Impact
======

An attacker can trick a user or automated system to process an archive
with malformed PaX extension headers into execute arbitrary code, crash
an application using the library, or cause a high CPU load.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libarchive or bsdtar users should upgrade to the latest libarchive
version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/libarchive-2.2.4"

References
==========

  [ 1 ] CVE-2007-3641
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3641
  [ 2 ] CVE-2007-3644
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3644
  [ 3 ] CVE-2007-3645
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3645

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200708-03.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 2007 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