[Full-disclosure] [ GLSA 200612-10 ] Tar: Directory traversal vulnerability

[Matthias Geerdsen]

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Gentoo Linux Security Advisory                           GLSA 200612-10
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Tar: Directory traversal vulnerability
      Date: December 11, 2006
      Bugs: #155901
        ID: 200612-10

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Synopsis
========

Tar is vulnerable to directory traversal possibly allowing for the
overwriting of arbitrary files.

Background
==========

The Tar program provides the ability to create and manipulate tar
archives.

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

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  app-arch/tar      < 1.16-r2                            >= 1.16-r2

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

Tar does not properly extract archive elements using the GNUTYPE_NAMES
record name, allowing files to be created at arbitrary locations using
symlinks. Once a symlink is extracted, files after the symlink in the
archive will be extracted to the destination of the symlink.

Impact
======

An attacker could entice a user to extract a specially crafted tar
archive, possibly allowing for the overwriting of arbitrary files on
the system extracting the archive.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Tar users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/tar-1.16-r2"

References
==========

  [ 1 ] CVE-2006-6097
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6097

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

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

  http://security.gentoo.org/glsa/glsa-200612-10.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 at gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2006 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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