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full-disclosure-uk: [Full-disclosure] [ GLSA 200901-10 ] GnuTLS:

[Full-disclosure] [ GLSA 200901-10 ] GnuTLS: Certificate validation error

From: Pierre-Yves Rofes <py_at_nospam>
Date: Wed Jan 14 2009 - 22:49:12 GMT
To: gentoo-announce@gentoo.org


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  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200901-10
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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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