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                                  CERT-Renater

                       Note d'Information No. 2005/VULN392
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DATE                      : 21/06/2005

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running cpio.

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Gentoo Linux Security Advisory                           GLSA 200506-16
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                                             http://security.gentoo.org/
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   Severity: Normal
      Title: cpio: Directory traversal vulnerability
       Date: June 20, 2005
       Bugs: #90619
         ID: 200506-16

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Synopsis
========

cpio contains a flaw which may allow a specially crafted cpio archive
to extract files to an arbitrary directory.

Background
==========

cpio is a file archival tool which can also read and write tar files.

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

     -------------------------------------------------------------------
      Package        /  Vulnerable  /                        Unaffected
     -------------------------------------------------------------------
   1  app-arch/cpio      < 2.6-r3                             >= 2.6-r3

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

A vulnerability has been found in cpio that can potentially allow a
cpio archive to extract its files to an arbitrary directory of the
creator's choice.

Impact
======

An attacker could create a malicious cpio archive which would create
files in arbitrary locations on the victim's system. This issue could
also be used in conjunction with a previous race condition
vulnerability (CAN-2005-1111) to change permissions on files owned by
the victim.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All cpio users should upgrade to the latest version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=app-arch/cpio-2.6-r3"

References
==========

   [ 1 ] Original Advisory
         http://www.securityfocus.com/archive/1/396429
   [ 2 ] CAN-2005-1111
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1111

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

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

   http://security.gentoo.org/glsa/glsa-200506-16.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 2005 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/2.0

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