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

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Date: Mon, 11 Dec 2006 22:46:21 +0100
From: Matthias Geerdsen <vorlon@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200612-10 ] Tar: Directory traversal
	vulnerability

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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@...too.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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