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Gentoo Linux Security Advisory                           GLSA 201607-08
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Dropbear: Privilege escalation
     Date: July 20, 2016
     Bugs: #577050
       ID: 201607-08

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Synopsis
========

A vulnerability has been found in Dropbear, which allows remote
authenticated users to bypass intended shell-command restrictions.

Background
==========

Dropbear is a relatively small SSH server and client.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/dropbear           < 2016.73                 >= 2016.73 

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

A CRLF injection vulnerability in Dropbear SSH allows remote
authenticated users to bypass intended shell-command restrictions via
crafted X11 forwarding data.

Impact
======

A remote authenticated user could execute arbitrary code with the
privileges of the process.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Dropbear users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/dropbear-2016.73"

References
==========

[ 1 ] CVE-2016-3116
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-3116

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

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

 https://security.gentoo.org/glsa/201607-08

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 2016 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