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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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