– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
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

—–BEGIN PGP SIGNATURE—–
Version: GnuPG v2.0

iQJ8BAEBCgBmBQJYq4ETXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w
ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQzM0M1ODQ4MkM0MDIyOTJEMkUzQzVDMDY5
NzA5RjkwQzNDOTZGRkM4AAoJEJcJ+Qw8lv/ILLYQAKDH4Tm0mVn9Vxnt4ZB7bG6b
9ZvZ5odoeTfXFtMomYtntVKPDsiX52FF2IqYp3J/+BoVHrttJFK1HKPuw+Zhvfwo
+1AQKt6p95fiZiAuIzn0JHHEB525Cj3U31VpJtMQAWffR/YKDtjzG287fUwH96oh
VIQGmnAWDisoULHbR9DYRrb5hanArhdHHAOdccXKsvlXDP++IGXsrXjn+yop/Kyq
AGmqqCiUUL3oqd9kGzKx/ukELAqGZS9jyuuuTMg4NdKORA1ia8v4PpRAPMGoEquG
M6Kwv7P3w7NrRFcklEimQ6yMdX2u8eoAfZywoCrzpSLcNZ4fqAFrIkodtjukB6gK
/SgK6eRzmOoIpBjmSyE4NlQK2o7u6pRw7wL8f1RSTlqwJBl9bvuV+RnLXsAg1Hx4
povE6Cz6nDcKk3TSoUO/dI+bWJQr5gFeXdDUwYgsVhXmb54j61M1P1lUYZ0bkSCf
Ep5megMXlsQpDY/S2Fs5/kv4q+150tQ5Pd6R08ezj1dgoI3Gkiq2qvFYcNHgUzJm
YDrLlf7dqSr5HRq7MBhOZi/Z6wMoDgXJx3lhqpzgDHRPOAvUCxxOV0k5dRYkwpPz
ezwzbZLiaGAOBKMZlNpem7e6Mj8yyoOC1RXRsOa0jze955b7Wx//oXxaT9xMpTgS
Xld4jpeuxD8WdJcHd4Z0
=gqxf
—–END PGP SIGNATURE—–