CVE-2017-15132: dovecot: auth client leaks memory if SASL authentication is aborted.

[Aki Tuomi <aki.tuomi () open-xchange com>]

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 
https://github.com/dovecot/core/commit/1a29ed2f96da1be22fa5a4d96c7583aa81b8b060.patch

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

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