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TUCoPS :: Linux :: Gentoo :: va2325.htm

GnuTLS: Certificate validation error



GnuTLS: Certificate validation error
GnuTLS: Certificate validation error



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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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