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

                       ESB-2007.0936 -- [UNIX/Linux]
                           Cpio: Buffer overflow
                             19 November 2007

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

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

Product:              cpio
Publisher:            Gentoo
Operating System:     Gentoo
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-4476

Original Bulletin:    http://security.gentoo.org/glsa/glsa-200711-18.xml

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

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Gentoo Linux Security Advisory                           GLSA 200711-18
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Cpio: Buffer overflow
      Date: November 14, 2007
      Bugs: #196978
        ID: 200711-18

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Synopsis
========

GNU cpio contains a buffer overflow vulnerability, possibly resulting
in a Denial of Service.

Background
==========

GNU cpio copies files into or out of a cpio or tar archive.

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

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  app-arch/cpio      < 2.9-r1                             >= 2.9-r1

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

A buffer overflow vulnerability in the safer_name_suffix() function in
GNU cpio has been discovered.

Impact
======

A remote attacker could entice a user to open a specially crafted
archive file resulting in a stack-based buffer overflow, possibly
crashing the application. It is disputed whether the execution of
arbitrary code is possible.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GNU cpio users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/cpio-2.9-r1"

References
==========

  [ 1 ] CVE-2007-4476
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4476

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

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

  http://security.gentoo.org/glsa/glsa-200711-18.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
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