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[gentoo-announce] [ GLSA 201309-20 ] Dropbear: Multiple vulnerabilities

Posted on 27 September 2013
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 201309-20
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http://security.gentoo.org/
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Severity: Normal
Title: Dropbear: Multiple vulnerabilities
Date: September 26, 2013
Bugs: #328409, #405607
ID: 201309-20

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Synopsis
========
Multiple vulnerabilities have been found in Dropbear, the worst of
which could lead to arbitrary code execution.

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

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/dropbear < 2012.55 >= 2012.55

Description
===========
Multiple vulnerabilities have been discovered in Dropbear. Please
review the CVE identifier and Gentoo bug referenced below for details.

Impact
======
A remote attacker could send a specially crafted request to trigger a
use-after-free condition, possibly resulting in arbitrary code
execution or a Denial of Service condition. Additionally, the bundled
version of libtommath has an error in its prime number generation,
which could result in the generation of weak keys.

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-2012.55"

References
==========
[ 1 ] CVE-2012-0920
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0920
[ 2 ] libtommath Gentoo bug
https://bugs.gentoo.org/show_bug.cgi?id=328383

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

http://security.gentoo.org/glsa/glsa-201309-20.xml

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 2013 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


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