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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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