A Dovecot security update has been released for Gentoo Linux to address multiple vulnerabilities.
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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
=================
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Package / Vulnerable / Unaffected
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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
