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UNIRAS Brief - 728/06 - OpenPKG Security Advisory: OpenPKG-SA-2006.032 - openssh



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______________________________________________________________________________

 UNIRAS (UK Government CERT) Briefing - 728/06 dated 09.11.06 time 14:35
 UNIRAS is part of NISCC (the UK National Infrastructure Security
 Co-ordination Centre)
______________________________________________________________________________

 UNIRAS material is available from the NISCC website at www.niscc.gov.uk
______________________________________________________________________________

Title
=====

OpenPKG Security Advisory: OpenPKG-SA-2006.032 - openssh

Detail
======

According to a vendor release announcement [0], a vulnerability
exists in the privilege separation functionality of the Secure
Shell (SSH) implementation OpenSSH [1]. The vulnerability is
caused by an incorrect checking for bad signatures in the sshd(8)
privilege separation monitor and this way its verification of
successful authentication is weakened.


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________________________________________________________________________

OpenPKG Security Advisory                                   OpenPKG GmbH
http://openpkg.org/security/                          http://openpkg.com
OpenPKG-SA-2006.032                                           2006-11-08
________________________________________________________________________

Package:          openssh
Vulnerability:    security bypass
OpenPKG Specific: no

Affected Series:  Affected Packages:          Corrected Packages:
E1.0-SOLID        <= openssh-4.4p1-E1.0.0     >= openssh-4.4p1-E1.0.1
2-STABLE-20061018 <= openssh-4.4p1-2.20061024 >= openssh-4.5p1-2.20061108
2-STABLE          <= openssh-4.4p1-2.20061024 >= openssh-4.5p1-2.20061108
CURRENT           <= openssh-4.4p1-20061104   >= openssh-4.5p1-20061108

Description:
  According to a vendor release announcement [0], a vulnerability
  exists in the privilege separation functionality of the Secure
  Shell (SSH) implementation OpenSSH [1]. The vulnerability is
  caused by an incorrect checking for bad signatures in the sshd(8)
  privilege separation monitor and this way its verification of
  successful authentication is weakened. As a result the monitor and the
  unprivileged process can get out of sync. According to the vendor,
  this bug is not known to be exploitable in the absence of additional
  vulnerabilities. Additionally, OpenPKG's OpenSSH configuration for
  portability reasons has the "privilege separation" functionality not
  enabled by default.
________________________________________________________________________

References:
  [0] http://www.openssh.com/txt/release-4.5
  [1] http://www.openssh.com/
________________________________________________________________________

For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG <openpkg@xxxxxxxxxxx>" (ID 63C4CB9F) which
you can retrieve from http://openpkg.org/openpkg.org.pgp. Follow the
instructions on http://openpkg.org/security/signatures/ for details on
how to verify the integrity of this advisory.
________________________________________________________________________

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______________________________________________________________________________

UNIRAS wishes to acknowledge the contributions of OpenPKG for the
information contained in this briefing.
______________________________________________________________________________

This notice contains information released by the original author.
Some of the information may have changed since it was released. If the
vulnerability affects you, it may be prudent to retrieve the advisory
from the site of the original source to ensure that you receive the most
current information concerning that problem.

Reference to any specific commercial product, process, or service by
trade name, trademark manufacturer, or otherwise, does not constitute or
imply its endorsement, recommendation, or favouring by UNIRAS or NISCC.
The views and opinions of authors expressed within this notice shall not
be used for advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors
or omissions contained within this briefing notice. In particular, they
shall not be liable for any loss or damage whatsoever, arising from or
in connection with the usage of information contained within this
notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams
(FIRST) and has contacts with other international Incident Response
Teams (IRTs) in order to foster cooperation and coordination in incident
prevention, to prompt rapid reaction to incidents, and to promote
information sharing amongst its members and the community at large.
______________________________________________________________________________

<End of UNIRAS Briefing>

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