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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.

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