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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
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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