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Date: Mon, 07 Nov 2011 12:15:48 +0100
From: Jan Lieskovsky <>
To: "Steven M. Christey" <>
        Nanakos Chrysostomos <>,
        Dennis Gilmore <>
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:


Could you allocate a CVE id for this?

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

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