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TUCoPS :: Linux :: Gentoo :: bx3575.htm

OpenSSL: Denial of Service



OpenSSL: Denial of Service
OpenSSL: Denial of Service



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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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