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From: Thomas Deutschmann <whissi@gentoo.org>
Reply-To: security@gentoo.org
To: gentoo-announce@lists.gentoo.org
Message-ID: <1fa87369-526d-89ee-08c6-2abd707e87c9@gentoo.org>
Subject: [ GLSA 201808-02 ] LinuX Containers user space utilities: Arbitrary
 file read

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Gentoo Linux Security Advisory                           GLSA 201808-02
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                                           https://security.gentoo.org/
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 Severity: Low
    Title: LinuX Containers user space utilities: Arbitrary file read
     Date: August 22, 2018
     Bugs: #662780
       ID: 201808-02

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Synopsis
========

A vulnerability has been found in LXC which may allow for arbitrary
file access (read-only).

Background
==========

LinuX Containers user space utilities.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-emulation/lxc           < 3.0.1-r1               >= 3.0.1-r1

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

lxc-user-nic when asked to delete a network interface will
unconditionally open a user provided path. This code path may be used
by an unprivileged user to check for the existence of a path which they
wouldn't otherwise be able to reach.

Impact
======

A local unprivileged user could use this flaw to access arbitrary
files, including special device files.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All LXC users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-emulation/lxc-3.0.1-r1"

References
==========

[ 1 ] CVE-2018-6556
      https://nvd.nist.gov/vuln/detail/CVE-2018-6556

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

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

 https://security.gentoo.org/glsa/201808-02

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 2018 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


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