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Gentoo Linux Security Advisory                           GLSA 201706-22
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: libksba: Denial of Service and information disclosure
     Date: June 22, 2017
     Bugs: #592078
       ID: 201706-22

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Synopsis
========

Multiple vulnerabilities have been found in libksba which might allow
remote attackers to obtain sensitive information or crash an
libksba-based application.

Background
==========

Libksba is a X.509 and CMS (PKCS#7) library.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libksba             < 1.3.5                    >= 1.3.5

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

It was found that an unproportionate amount of memory is allocated when
parsing crafted certificates in libskba, which may lead to Denial of
Service condition.

Moreover in libksba 1.3.4, allocated memory is uninitialized and could
potentially contain sensitive data left in freed memory block.

Impact
======

A remote attacker, able to interact with an libksba-based application,
could possibly obtain sensitive information or cause a Denial of
Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libksba users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libksba-1.3.5"

References
==========

[ 1 ] CVE-2016-4579
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-4579
[ 2 ] Upstream report
      http://seclists.org/oss-sec/2016/q3/343

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

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

 https://security.gentoo.org/glsa/201706-22

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