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Gentoo Linux Security Advisory                           GLSA 201206-18
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: GnuTLS: Multiple vulnerabilities
     Date: June 23, 2012
     Bugs: #281224, #292025, #389947, #409287
       ID: 201206-18

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Synopsis
========

Multiple vulnerabilities have been found in GnuTLS, allowing a remote
attacker to perform man-in-the-middle or Denial of Service attacks.

Background
==========

GnuTLS is an Open Source implementation of the TLS 1.2 and SSL 3.0
protocols.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-libs/gnutls             < 2.12.18                 >= 2.12.18

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

Multiple vulnerabilities have been found in GnuTLS:

* An error in libgnutls does not properly sanitize "\0" characters from
  certificate fields (CVE-2009-2730).
* An error in the TLS and SSL protocols mistreats renegotiation
  handshakes (CVE-2009-3555).
* A boundary error in the "gnutls_session_get_data()" function in
  gnutls_session.c could cause a buffer overflow (CVE-2011-4128).
* An error in the "_gnutls_ciphertext2compressed()" function in
  gnutls_cipher.c could cause memory corruption (CVE-2012-1573).

Impact
======

A remote attacker could perform man-in-the-middle attacks to spoof
arbitrary SSL servers or cause a Denial of Service condition in
applications linked against GnuTLS.

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-2.12.18"

References
==========

[ 1 ] CVE-2009-2730
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-2730
[ 2 ] CVE-2009-3555
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-3555
[ 3 ] CVE-2011-4128
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4128
[ 4 ] CVE-2012-1573
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-1573

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

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

 http://security.gentoo.org/glsa/glsa-201206-18.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
https://bugs.gentoo.org.

License
=======

Copyright 2012 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