[ GLSA 200612-19 ] pam_ldap: Authentication bypass vulnerability

[Raphael Marichez <falco () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200612-19
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: pam_ldap: Authentication bypass vulnerability
      Date: December 20, 2006
      Bugs: #153916
        ID: 200612-19

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Synopsis
========

pam_ldap contains a vulnerability that may allow a remote user with a
locked account to gain unauthorized system access.

Background
==========

pam_ldap is a Pluggable Authentication Module which allows
authentication against LDAP directories.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  sys-auth/pam_ldap        < 183                             >= 183

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

Steve Rigler discovered that pam_ldap does not correctly handle
"PasswordPolicyResponse" control responses from an LDAP directory. This
causes the pam_authenticate() function to always succeed, even if the
previous authentication failed.

Impact
======

A locked user may exploit this vulnerability to bypass the LDAP
authentication mechanism, possibly gaining unauthorized access to the
system.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All pam_ldap users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-183"

References
==========

  [ 1 ] CVE-2006-5170
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5170

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

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

  http://security.gentoo.org/glsa/glsa-200612-19.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 2006 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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