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Gentoo Linux Security Advisory                           GLSA 201709-20
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                                           https://security.gentoo.org/
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 Severity: High
    Title: Postfix: Privilege escalation
     Date: September 24, 2017
     Bugs: #621882
       ID: 201709-20

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Synopsis
========

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

Background
==========

Postfix is a mail server and an alternative to the widely-used Sendmail
program.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  mail-mta/postfix             < 3.1.6                    >= 3.1.6 

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

By default, Berkeley DB reads a DB_CONFIG configuration file from the
current working directory. This is an undocumented behavior.

Impact
======

A local attacker, by using a specially crafted DG_CONFIG file, could
possibly escalate privileges to the root group.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Postfix users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=mail-mta/postfix-3.1.6"

References
==========

[ 1 ] Postfix Official Announce
      http://www.postfix.org/announcements/postfix-3.2.2.html

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

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

 https://security.gentoo.org/glsa/201709-20

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
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