From: Raphael Marichez (falcogentoo.org)
Date: Sat Sep 15 2007 - 17:21:35 CDT

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Gentoo Linux Security Advisory GLSA 200709-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: GNU Tar: Directory traversal vulnerability
      Date: September 15, 2007
      Bugs: #189682
        ID: 200709-09

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Synopsis
========

A directory traversal vulnerability has been discovered in GNU Tar.

Background
==========

The GNU Tar program provides the ability to create tar archives, as
well as various other kinds of manipulation.

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

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 app-arch/tar < 1.18-r2 >= 1.18-r2

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

Dmitry V. Levin discovered a directory traversal vulnerability in the
contains_dot_dot() function in file src/names.c.

Impact
======

By enticing a user to extract a specially crafted tar archive, a remote
attacker could extract files to arbitrary locations outside of the
specified directory with the permissions of the user running GNU Tar.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GNU Tar users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/tar-1.18-r2"

References
==========

  [ 1 ] CVE-2007-4131
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4131

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

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

  http://security.gentoo.org/glsa/glsa-200709-09.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
securitygentoo.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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