A Dovecot security update has been released for Gentoo Linux.

GLSA 202101-01 : Dovecot: Multiple vulnerabilities

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Gentoo Linux Security Advisory GLSA 202101-01
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  https://security.gentoo.org/
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Severity: Normal
Title: Dovecot: Multiple vulnerabilities
Date: January 10, 2021
Bugs: #763525
ID: 202101-01

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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 < 2.3.13 &rt;= 2.3.13

Description
==========
Multiple vulnerabilities have been discovered in Dovecot. Please review
the CVE identifiers referenced below for details.

Impact
=====
A remote attacker could send a specially crafted mail or send a
specially crafted IMAP command possibly resulting in a Denial of
Service condition or an authenticated remote attacker might be able to
discover the file system directory structure and access other users'
emails.

Workaround
=========
The information disclosure vulnerability can be mitigated by disabling
IMAP hibernation feature which isn't enabled by default.

Resolution
=========
All Dovecot users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "&rt;=net-mail/dovecot-2.3.13"

References
=========
[ 1 ] CVE-2020-24386
  https://nvd.nist.gov/vuln/detail/CVE-2020-24386
[ 2 ] CVE-2020-25275
  https://nvd.nist.gov/vuln/detail/CVE-2020-25275

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

  https://security.gentoo.org/glsa/202101-01

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 2021 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