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Gentoo Linux Security Advisory                           GLSA 200711-18
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                                            https://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:

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

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
https://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.

https://creativecommons.org/licenses/by-sa/2.5/
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