[ GLSA 200806-08 ] OpenSSL: Denial of Service

[Robert Buchholz <rbu () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200806-08
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: OpenSSL: Denial of Service
      Date: June 23, 2008
      Bugs: #223429
        ID: 200806-08

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Synopsis
========

Two vulnerabilities might allow for a Denial of Service of daemons
using OpenSSL.

Background
==========

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.

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

    -------------------------------------------------------------------
     Package           /   Vulnerable   /                   Unaffected
    -------------------------------------------------------------------
  1  dev-libs/openssl      < 0.9.8g-r2                    >= 0.9.8g-r2
                                                              < 0.9.8f

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

Ossi Herrala and Jukka Taimisto of Codenomicon discovered two
vulnerabilities:

* A double free() call in the TLS server name extension
  (CVE-2008-0891).

* The OpenSSL client code does not properly handle servers that omit
  the Server Key Exchange message in the TLS handshake (CVE-2008-1672).

Impact
======

A remote attacker could connect to a vulnerable server, or entice a
daemon to connect to a malicious server, causing a Denial of Service of
the daemon in both cases.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenSSL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.8g-r2"

References
==========

  [ 1 ] CVE-2008-0891
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0891
  [ 2 ] CVE-2008-1672
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1672

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

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

  http://security.gentoo.org/glsa/glsa-200806-08.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
http://bugs.gentoo.org.

License
=======

Copyright 2008 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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