- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 201702-23
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                           https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 Severity: Normal
    Title: Dropbear: Multiple vulnerabilities
     Date: February 20, 2017
     Bugs: #605560
       ID: 201702-23

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

Multiple vulnerabilities have been found in Dropbear, the worst of
which allows remote attackers to execute arbitrary code.

Background
==========

Dropbear is an SSH server and client designed with a small memory
footprint.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/dropbear           < 2016.74                 >= 2016.74

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

Multiple vulnerabilities have been discovered in Dropbear. Please
review the CVE identifiers referenced below for details.

Impact
======

A remote attacker could possibly execute arbitrary code with root
privileges if usernames containing special characters can be created on
a system. Also, a dbclient user who can control username or host
arguments could potentially run arbitrary code with the privileges of
the process.

In addition, a remote attacker could entice a user to process a
specially crafted SSH key using dropbearconvert, possibly resulting in
execution of arbitrary code with the privileges of the process or a
Denial of Service condition.

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-2016.74"

References
==========

[ 1 ] CVE-2016-7406
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7406
[ 2 ] CVE-2016-7407
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7407
[ 3 ] CVE-2016-7408
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7408
[ 4 ] CVE-2016-7409
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7409

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

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

 https://security.gentoo.org/glsa/201702-23

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.

http://creativecommons.org/licenses/by-sa/2.5


--VrD7fqcu6xqU0tPFpCStfRBJLuJI6ckQ5--