Gentoo: cpio Directory traversal vulnerability
Posted by Benjamin D. Thomas   
Gentoo cpio contains a flaw which may allow a specially crafted cpio archive to extract files to an arbitrary directory.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200506-16
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: cpio: Directory traversal vulnerability
      Date: June 20, 2005
      Bugs: #90619
        ID: 200506-16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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