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[gentoo-announce] [ GLSA 201703-05 ] GNU Libtasn1: Denial of Service

Posted on 28 March 2017
Gentoo-announce

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From: Yury German <blueknight@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <3deb4bfd-08fb-3efb-bb62-96231e3ed446@gentoo.org>
Subject: [ GLSA 201703-05 ] GNU Libtasn1: Denial of Service

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Gentoo Linux Security Advisory GLSA 201703-05
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https://security.gentoo.org/
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Severity: Normal
Title: GNU Libtasn1: Denial of Service
Date: March 28, 2017
Bugs: #579748
ID: 201703-05

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Synopsis
========
A vulnerability in Libtasn1 allows remote attackers to cause a Denial
of Service condition.

Background
==========
A library that provides Abstract Syntax Notation One (ASN.1, as
specified by the X.680 ITU-T recommendation) parsing and structures
management, and Distinguished Encoding Rules (DER, as per X.690)
encoding and decoding functions.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/libtasn1 < 4.8 >= 4.8

Description
===========
Libtasn1 does not correctly handle certain malformed DER certificates.

Impact
======
A remote attacker could entice a user or automated system to process a
specially crafted certificate using Libtasn1, resulting in a Denial of
Service condition.

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/libtasn1-4.8"

References
==========
[ 1 ] CVE-2016-4008
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-4008

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

https://security.gentoo.org/glsa/201703-05

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 2017 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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