oss-security - CVE Request -- pam_yubico -- Authentication bypass via NULL password

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Message-ID: <4EB7BDE4.4000100@redhat.com>
Date: Mon, 07 Nov 2011 12:15:48 +0100
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security@...ts.openwall.com,
        Nanakos Chrysostomos <nanakos@...ed-net.gr>,
        Dennis Gilmore <dennis@...il.us>
Subject: CVE Request -- pam_yubico -- Authentication bypass via NULL password

Hello Kurt, Steve, vendors,

   a security flaw was found in the way pam_yubico, a pluggable
authentication module for yubikeys, performed user authentication,
when 'use_first_pass' PAM configuration option was not used and
pam_yubico module was configured as 'sufficient' in the PAM 
configuration. A remote attacker could use this flaw to circumvent
common authentication process and obtain access to the account in
question by providing a NULL value (pressing Ctrl-D keyboard
sequence) as the password string.

Relevant upstream patch:
[1] 
https://github.com/Yubico/yubico-pam/commit/4712da70cac159d5ca9579c1e4fac0645b674043

References:
[2] 
http://groups.google.com/group/yubico-devel/browse_thread/thread/3f179ec0e6845deb
[3] https://bugzilla.redhat.com/show_bug.cgi?id=733322

Could you allocate a CVE id for this?

Thank you && Regards, Jan.
--
Jan iankko Lieskovsky / Red Hat Security Response Team

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