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TITLE:
GnuTLS X.509 CN and SAN Fields NUL Character Spoofing Vulnerability

SECUNIA ADVISORY ID:
SA36266

VERIFY ADVISORY:
http://secunia.com/advisories/36266/

DESCRIPTION:
A vulnerability has been reported in GnuTLS, which can be exploited
by malicious people to conduct spoofing attacks.

The vulnerability is caused due to an error when parsing X.509 CN and
SAN fields containing NUL ('\0') characters. This can be exploited to
e.g. stop GnuTLS from printing the entire CN and SAN fields and
conduct Man-in-the-Middle (MitM) attacks on server-authenticated TLS
sessions via specially crafted X.509 certificates.

The vulnerability is reported in versions prior to 2.8.2.

SOLUTION:
Fixed in the GIT repository.

PROVIDED AND/OR DISCOVERED BY:
Independently discovered by Dan Kaminsky and Moxie Marlinspike.

ORIGINAL ADVISORY:
GNUTLS-SA-2009-4:
http://article.gmane.org/gmane.network.gnutls.general/1733

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