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Gentoo Linux Security Advisory                           GLSA 202105-01
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                                            https://security.gentoo.org/
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  Severity: High
     Title: Exim: Multiple vulnerabilities
      Date: May 04, 2021
      Bugs: #786945
        ID: 202105-01

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Synopsis
=======
Multiple vulnerabilities have been found in Exim, the worst of which
allows remote attackers to execute arbitrary code.

Background
=========
Exim is a message transfer agent (MTA) designed to be a a highly
configurable, drop-in replacement for sendmail.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  mail-mta/exim                < 4.94.2                  >= 4.94.2

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

Impact
=====
A remote attacker, by connecting to the SMTP listener daemon, could
possibly execute arbitrary code with the privileges of the process or
cause a Denial of Service condition. Furthermore, a local attacker
could perform symlink attacks to overwrite arbitrary files with the
privileges of the user running the application or escalate privileges.

Workaround
=========
There is no known workaround at this time.

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

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=mail-mta/exim-4.94.2"

References
=========
[  1 ] CVE-2020-28007
        https://nvd.nist.gov/vuln/detail/CVE-2020-28007
[  2 ] CVE-2020-28008
        https://nvd.nist.gov/vuln/detail/CVE-2020-28008
[  3 ] CVE-2020-28009
        https://nvd.nist.gov/vuln/detail/CVE-2020-28009
[  4 ] CVE-2020-28010
        https://nvd.nist.gov/vuln/detail/CVE-2020-28010
[  5 ] CVE-2020-28011
        https://nvd.nist.gov/vuln/detail/CVE-2020-28011
[  6 ] CVE-2020-28012
        https://nvd.nist.gov/vuln/detail/CVE-2020-28012
[  7 ] CVE-2020-28013
        https://nvd.nist.gov/vuln/detail/CVE-2020-28013
[  8 ] CVE-2020-28014
        https://nvd.nist.gov/vuln/detail/CVE-2020-28014
[  9 ] CVE-2020-28015
        https://nvd.nist.gov/vuln/detail/CVE-2020-28015
[ 10 ] CVE-2020-28016
        https://nvd.nist.gov/vuln/detail/CVE-2020-28016
[ 11 ] CVE-2020-28017
        https://nvd.nist.gov/vuln/detail/CVE-2020-28017
[ 12 ] CVE-2020-28018
        https://nvd.nist.gov/vuln/detail/CVE-2020-28018
[ 13 ] CVE-2020-28019
        https://nvd.nist.gov/vuln/detail/CVE-2020-28019
[ 14 ] CVE-2020-28020
        https://nvd.nist.gov/vuln/detail/CVE-2020-28020
[ 15 ] CVE-2020-28021
        https://nvd.nist.gov/vuln/detail/CVE-2020-28021
[ 16 ] CVE-2020-28022
        https://nvd.nist.gov/vuln/detail/CVE-2020-28022
[ 17 ] CVE-2020-28023
        https://nvd.nist.gov/vuln/detail/CVE-2020-28023
[ 18 ] CVE-2020-28024
        https://nvd.nist.gov/vuln/detail/CVE-2020-28024
[ 19 ] CVE-2020-28025
        https://nvd.nist.gov/vuln/detail/CVE-2020-28025
[ 20 ] CVE-2020-28026
        https://nvd.nist.gov/vuln/detail/CVE-2020-28026
[ 21 ] CVE-2021-27216
        https://nvd.nist.gov/vuln/detail/CVE-2021-27216

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

  https://security.gentoo.org/glsa/202105-01

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/