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Date: Tue, 24 Nov 2020 21:43:38 +0300
From: "Dmitry V. Levin" <ldv@...linux.org>
To: oss-security@...ts.openwall.com
Subject: Re: Heads up: PAM 1.5.0 has a auth bypass under some
conditions
Hi,
On Tue, Nov 24, 2020 at 07:20:21PM +0100, Marcus Meissner wrote:
> Hi,
>
> (via IRC, spotted by Foxboron)
>
> PAM 1.5.0 had a potential auth bypass, if a user did not exist and the root password was
> empty (but root locked down).
>
> The reporters usecase was spammers pretending to be unknown users with a PAM enabled dovecot.
>
> This issue affected only pam 1.5.0.
I'd like to note that the issue affects pam_unix module only,
those who use other authentication modules instead of pam_unix
are not effected.
Nevertheless, Linux-PAM 1.5.1 is going to be released shortly
to address this issue.
Just for the record, the bug was introduced by commit
https://github.com/linux-pam/linux-pam/commit/af0faf666c5008e54dfe43684f210e3581ff1bca
and fixed by commit
https://github.com/linux-pam/linux-pam/commit/30fdfb90d9864bcc254a62760aaa149d373fd4eb
--
ldv
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