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Gentoo Linux Security Advisory                           GLSA 200612-19
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                                            https://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
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200612-19

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
https://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.

https://creativecommons.org/licenses/by-sa/2.5/