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:  https://github.com/Yubico/yubico-pam/commit/4712da70cac159d5ca9579c1e4fac0645b674043 References:  http://groups.google.com/group/yubico-devel/browse_thread/thread/3f179ec0e6845deb  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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