bugtraq - [ GLSA 200711-02 ] OpenSSH: Security bypass

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Date: Fri, 02 Nov 2007 01:15:30 +0100
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org, full-disclosure@...ts.grok.org.uk,
	bugtraq@...urityfocus.com, security-alerts@...uxsecurity.com
Subject: [ GLSA 200711-02 ] OpenSSH: Security bypass

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Gentoo Linux Security Advisory                           GLSA 200711-02
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: OpenSSH: Security bypass
      Date: November 01, 2007
      Bugs: #191321
        ID: 200711-02

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Synopsis
========

A flaw has been discovered in OpenSSH which could allow a local
attacker to bypass security restrictions.

Background
==========

OpenSSH is a complete SSH protocol implementation that includes an SFTP
client and server support.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/openssh        < 4.7                              >= 4.7

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

Jan Pechanec discovered that OpenSSH uses a trusted X11 cookie when it
cannot create an untrusted one.

Impact
======

An attacker could bypass the SSH client security policy and gain
privileges by causing an X client to be treated as trusted.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenSSH users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/openssh-4.7"

References
==========

  [ 1 ] CVE-2007-4752
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4752

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

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

  http://security.gentoo.org/glsa/glsa-200711-02.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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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