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Gentoo Linux Security Advisory                           GLSA 201402-19
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: libtar: Arbitraty code execution
     Date: February 21, 2014
     Bugs: #487420
       ID: 201402-19

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Synopsis
========

A buffer overflow in libtar might allow remote attackers to execute
arbitrary code or cause a Denial of Service condition.

Background
==========

libtar is a C library for manipulating POSIX tar files.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libtar            < 1.2.20-r2              >= 1.2.20-r2

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

An integer overflow error within the =E2=80=9Cth_read()=E2=80=9D function=
 when
processing long names or link extensions can be exploited to cause a
heap-based buffer overflow via a specially crafted archive.

Impact
======

A remote attacker could entice a user to open a specially crafted file
using a program linked against libtar, possibly resulting in execution
of arbitrary code with the privileges of the process or a Denial of
Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libtar users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libtar-1.2.20-r2"

References
==========

[ 1 ] CVE-2013-4397
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4397

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

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

 http://security.gentoo.org/glsa/glsa-201402-19.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
https://bugs.gentoo.org.

License
=======

Copyright 2014 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