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Date: Mon, 07 Nov 2011 08:49:23 -0700
From: Kurt Seifried <>
CC: Jan Lieskovsky <>,
        "Steven M. Christey" <>,
        Nanakos Chrysostomos <>,
        Dennis Gilmore <>
Subject: Re: CVE Request -- pam_yubico -- Authentication bypass
 via NULL password

On 11/07/2011 04:15 AM, Jan Lieskovsky wrote:
> 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]
> References:
> [2]
> [3]
> Could you allocate a CVE id for this?
Please use CVE-2011-4120 for this issue.
> Thank you && Regards, Jan.
> -- 
> Jan iankko Lieskovsky / Red Hat Security Response Team


-Kurt Seifried / Red Hat Security Response Team

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