[ GLSA 200805-20 ] GnuTLS: Execution of arbitrary code

[Robert Buchholz <rbu () gentoo org>]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200805-20
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: High
     Title: GnuTLS: Execution of arbitrary code
      Date: May 21, 2008
      Bugs: #222823
        ID: 200805-20

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

Multiple vulnerabilities might allow for the execution of arbitrary
code in daemons using GnuTLS.

Background
==========

GnuTLS is an implementation of Secure Sockets Layer (SSL) 3.0 and
Transport Layer Security (TLS) 1.0, 1.1 and 1.2.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-libs/gnutls       < 2.2.5                            >= 2.2.5

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

Ossi Herrala and Jukka Taimisto of Codenomicon reported three
vulnerabilities in libgnutls of GnuTLS:

* "Client Hello" messages containing an invalid server name can lead
  to a buffer overflow when evaluating "Security Parameters"
  (CVE-2008-1948).

* Multiple "Client Hello" messages can lead to a NULL pointer
  dereference (CVE-2008-1949).

* A TLS handshake including an encrypted "Client Hello" message and
  an invalid record length could lead to a buffer overread
  (CVE-2008-1950).

Impact
======

Unauthenticated remote attackers could exploit these vulnerabilities to
cause Denial of Service conditions in daemons using GnuTLS. The first
vulnerability (CVE-2008-1948) might allow for the execution of
arbitrary code with the privileges of the daemon handling incoming TLS
connections.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GnuTLS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-libs/gnutls-2.2.5"

References
==========

  [ 1 ] CVE-2008-1948
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1948
  [ 2 ] CVE-2008-1949
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1949
  [ 3 ] CVE-2008-1950
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1950

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

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

  http://security.gentoo.org/glsa/glsa-200805-20.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

Attachment: signature.asc
Description: This is a digitally signed message part.