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Gentoo Linux Security Advisory                           GLSA 201711-09
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: LXC: Remote security bypass
     Date: November 11, 2017
     Bugs: #636386
       ID: 201711-09

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Synopsis
========

A vulnerability in LXC may lead to an unauthorized security bypass.

Background
==========

LinuX Containers userspace utilities 

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-emulation/lxc            < 2.0.7                    >= 2.0.7 

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

Previous versions of lxc-attach ran a shell or the specified command
without allocating a pseudo terminal making it vulnerable to input
faking via a TIOCSTI ioctl call.

Impact
======

Remote attackers can escape the container and perform unauthorized
modifications.

Workaround
==========

There is no know workaround at this time.

Resolution
==========

All LXC users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-emulation/lxc-2.0.7"

References
==========

[ 1 ] CVE-2016-10124
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-10124

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

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

 https://security.gentoo.org/glsa/201711-09

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
=======