[ GLSA 200905-04 ] GnuTLS: Multiple vulnerabilities

[Alex Legler <a3li () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200905-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: GnuTLS: Multiple vulnerabilities
      Date: May 24, 2009
      Bugs: #267774
        ID: 200905-04

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Synopsis
========

Multiple vulnerabilities in GnuTLS might result in a Denial of Service,
spoofing or the generation of invalid keys.

Background
==========

GnuTLS is an Open Source implementation of the TLS 1.0 and SSL 3.0
protocols.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-libs/gnutls       < 2.6.6                            >= 2.6.6

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

The following vulnerabilities were found in GnuTLS:

* Miroslav Kratochvil reported that lib/pk-libgcrypt.c does not
  properly handle corrupt DSA signatures, possibly leading to a
  double-free vulnerability (CVE-2009-1415).

* Simon Josefsson reported that GnuTLS generates RSA keys stored in
  DSA structures when creating a DSA key (CVE-2009-1416).

* Romain Francoise reported that the
  _gnutls_x509_verify_certificate() function in lib/x509/verify.c does
  not perform time checks, resulting in the "gnutls-cli" program
  accepting X.509 certificates with validity times in the past or
  future (CVE-2009-1417).

Impact
======

A remote attacker could entice a user or automated system to process a
specially crafted DSA certificate, possibly resulting in a Denial of
Service condition. NOTE: This issue might have other unspecified impact
including the execution of arbitrary code. Furthermore, a remote
attacker could spoof signatures on certificates and the "gnutls-cli"
application can be tricked into accepting an invalid certificate.

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-2.6.6"

References
==========

  [ 1 ] CVE-2009-1415
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1415
  [ 2 ] CVE-2009-1416
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1416
  [ 3 ] CVE-2009-1417
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1417

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

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

  http://security.gentoo.org/glsa/glsa-200905-04.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 2009 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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