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Gentoo Linux Security Advisory                           GLSA 201709-19
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Exim: Local privilege escalation
     Date: September 24, 2017
     Bugs: #622212
       ID: 201709-19

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Synopsis
========

A vulnerability in Exim may allow local users to gain root privileges.

Background
==========

Exim is a message transfer agent (MTA) developed at the University of
Cambridge for use on Unix systems connected to the Internet.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  mail-mta/exim               < 4.89-r1                 >= 4.89-r1 

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

Exim supports the use of multiple "-p" command line arguments causing a
memory leak. This could lead to a stack-clash in user-space and as
result the attacker can, "clash" or "smash" the stack or another memory
region, or "jump" over the stack guard-page.

Impact
======

A local attacker could obtain root 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-4.89-r1"

References
==========

[ 1 ] CVE-2017-1000369
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-1000369

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

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

 https://security.gentoo.org/glsa/201709-19

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 2017 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.

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