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Date: Tue, 24 Nov 2020 19:20:21 +0100
From: Marcus Meissner <>
To: OSS Security List <>
Subject: Heads up: PAM 1.5.0 has a auth bypass under some conditions


(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.

News entry:


github issue reporting the problem:
Fixing commit:

Ciao, Marcus

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