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Gentoo Linux Security Advisory                           GLSA 202009-02
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Dovecot: Multiple vulnerabilities
     Date: September 06, 2020
     Bugs: #736617
       ID: 202009-02

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Synopsis
========

Multiple vulnerabilities have been found in Dovecot, the worst of which
could allow remote attackers to cause a Denial of Service condition.

Background
==========

Dovecot is an open source IMAP and POP3 email server.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-mail/dovecot            < 2.3.11.3               >= 2.3.11.3

Description
===========

It was discovered that Dovecot incorrectly handled deeply nested MIME
parts, incorrectly handled memory when using NTLM, and incorrectly
handled zero-length messages.

Impact
======

A remote attacker could send a specially crafted mail or send specially
crafted authentication requests possibly resulting in a Denial of
Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Dovecot users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-mail/dovecot-2.3.11.3"

References
==========

[ 1 ] CVE-2020-12100
      https://nvd.nist.gov/vuln/detail/CVE-2020-12100
[ 2 ] CVE-2020-12673
      https://nvd.nist.gov/vuln/detail/CVE-2020-12673
[ 3 ] CVE-2020-12674
      https://nvd.nist.gov/vuln/detail/CVE-2020-12674

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202009-02

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5