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Gentoo Linux Security Advisory                           GLSA 201909-08
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: D-Bus: Authentication bypass
     Date: September 08, 2019
     Bugs: #687900
       ID: 201909-08

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Synopsis
========

An authentication bypass was discovered in D-Bus.

Background
==========

D-Bus is a message bus system which processes can use to talk to each
other.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-apps/dbus               < 1.12.16                 >= 1.12.16

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

It was discovered that a local attacker could manipulate symbolic links
in their own home directory to bypass authentication and connect to a
DBusServer with elevated privileges.

Impact
======

A local attacker can bypass authentication mechanisms and elevate
privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All D-Bus users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-apps/dbus-1.12.16"

References
==========

[ 1 ] CVE-2019-12749
      https://nvd.nist.gov/vuln/detail/CVE-2019-12749

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

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

 https://security.gentoo.org/glsa/201909-08

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 2019 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