Gentoo: 201209-12 Libtasn1: Denial of Service
Posted by Benjamin D. Thomas   
Gentoo A vulnerability in Libtasn1 might cause a Denial of Service condition.
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Gentoo Linux Security Advisory                           GLSA 201209-12
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Libtasn1: Denial of Service
     Date: September 25, 2012
     Bugs: #409031
       ID: 201209-12

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Synopsis
========

A vulnerability in Libtasn1 might cause a Denial of Service condition.

Background
==========

Libtasn1 is a library used to parse ASN.1 (Abstract Syntax Notation
One) objects, and perform DER (Distinguished Encoding Rules) decoding.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libtasn1             < 2.12                     >= 2.12

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

Libtasn1 does not properly handle length fields when performing DER
decoding.

Impact
======

A remote attacker could entice a user to open a specially crafted
DER-encoded object in an application linked against Libtasn1, possibly
resulting in Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Libtasn1 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libtasn1-2.12"

Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying some of these
packages.

References
==========

[ 1 ] CVE-2012-1569
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-1569

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

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

 http://security.gentoo.org/glsa/glsa-201209-12.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 2012 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