[ GLSA 200710-15 ] KDM: Local privilege escalation

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200710-15
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                                            http://security.gentoo.org/
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  Severity: High
     Title: KDM: Local privilege escalation
      Date: October 14, 2007
      Bugs: #192373
        ID: 200710-15

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Synopsis
========

KDM allows logins without password under certain circumstances allowing
a local user to gain elevated privileges.

Background
==========

KDM is the Display Manager for the graphical desktop environment KDE.
It is part of the kdebase package.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  kde-base/kdm         < 3.5.7-r2                       >= 3.5.7-r2
  2  kde-base/kdebase     < 3.5.7-r4                       >= 3.5.7-r4
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Kees Huijgen discovered an error when checking the credentials which
can lead to a login without specifying a password. This only occurs
when auto login is configured for at least one user and a password is
required to shut down the machine.

Impact
======

A local attacker could gain root privileges and execute arbitrary
commands by logging in as root without specifying root's password.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All KDM users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=kde-base/kdm-3.5.7-r2"

All kdebase users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=kde-base/kdebase-3.5.7-r4"

References
==========

  [ 1 ] CVE-2007-4569
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4569

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

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

  http://security.gentoo.org/glsa/glsa-200710-15.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
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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