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Gentoo Linux Security Advisory                           GLSA 201702-23
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Dropbear: Multiple vulnerabilities
     Date: February 20, 2017
     Bugs: #605560
       ID: 201702-23

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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.

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