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Gentoo Linux Security Advisory                           GLSA 201402-19
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                                            https://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 “th_read()” 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:

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

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.

https://creativecommons.org/licenses/by-sa/2.5/