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[gentoo-announce] [ GLSA 201209-12 ] Libtasn1: Denial of Service

Posted on 26 September 2012
Gentoo-announce

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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


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