[ GLSA 200901-10 ] GnuTLS: Certificate validation error

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200901-10
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~                                             http://security.gentoo.org/
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~   Severity: Normal
~      Title: GnuTLS: Certificate validation error
~       Date: January 14, 2009
~       Bugs: #245850
~         ID: 200901-10

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Synopsis
========

A certificate validation error in GnuTLS might allow for spoofing
attacks.

Background
==========

GnuTLS is an open-source implementation of TLS 1.0 and SSL 3.0.

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

~     -------------------------------------------------------------------
~      Package          /  Vulnerable  /                      Unaffected
~     -------------------------------------------------------------------
~   1  net-libs/gnutls     < 2.4.1-r2                        >= 2.4.1-r2

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

Martin von Gagern reported that the _gnutls_x509_verify_certificate()
function in lib/x509/verify.c trusts certificate chains in which the
last certificate is an arbitrary trusted, self-signed certificate.

Impact
======

A remote attacker could exploit this vulnerability and spoof arbitrary
names to conduct Man-In-The-Middle attacks and intercept sensitive
information.

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-2.4.1-r2"

References
==========

~   [ 1 ] CVE-2008-4989
~         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4989

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

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

~   http://security.gentoo.org/glsa/glsa-200901-10.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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