Gentoo: OpenSSL Denial of Service
Posted by Benjamin D. Thomas   
Gentoo Two vulnerabilities might allow for a Denial of Service of daemons using OpenSSL.
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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