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Gentoo Linux Security Advisory                           GLSA 202003-47
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                                           https://security.gentoo.org/
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 Severity: High
    Title: Exim: Heap-based buffer overflow
     Date: March 20, 2020
     Bugs: #701282
       ID: 202003-47

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Synopsis
========

A vulnerability in Exim could allow a remote attacker 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                < 4.92.3                  >= 4.92.3

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

It was discovered that Exim incorrectly handled certain string
operations.

Impact
======

A remote attacker, able to connect to a vulnerable Exim instance, could
possibly execute arbitrary code with the privileges of the process or
cause a Denial of Service condition.

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-4.92.3"

References
==========

[ 1 ] CVE-2019-16928
      https://nvd.nist.gov/vuln/detail/CVE-2019-16928

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

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

 https://security.gentoo.org/glsa/202003-47

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