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Date: Wed, 31 Jan 2018 08:48:28 +0200 (EET)
From: Aki Tuomi <>
Subject: Re: CVE-2017-15132: dovecot: auth client leaks memory if SASL
 authentication is aborted.

> On January 25, 2018 at 11:35 AM Aki Tuomi <> wrote:
> Score: 5.3, AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
> Affected versions: 2.0 up to 2.2.33 and 2.3.0
> Fixed versions: 2.2.34 (not released yet), 2.3.1 (not released yet)
> We have identified a memory leak in Dovecot auth client used by login
> processes. The leak has impact in high performance configuration where
> same login processes are reused and can cause the process to crash due to memory exhaustion.
> Patch to apply this issue can be found from
> To our best knowledge, this patch should apply to all versions.
> This issue can be mitigated on vulnerably systems by limiting login process to single request per process, which is also the default value.
> Regards,
> Aki Tuomi
> Dovecot oy

Team Debian has found an issue with our patch. Dovecot login process would crash after few minutes of idle after consecutive aborted logins.

This is fixed with

We would like to thank Apollon and Salvatore for raising this to our attention. 

Aki Tuomi
Dovecot oy

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