GLSA 200508-22 pam_ldap: Authentication bypass vulnerability
Posted on: 09/01/2005 05:36 AM

A new security update has been released for Gentoo Linux - pam_ldap: Authentication bypass vulnerability. Here the announcement:

Gentoo Linux Security Advisory GLSA 200508-22
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http://security.gentoo.org/
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Severity: Normal
Title: pam_ldap: Authentication bypass vulnerability
Date: August 31, 2005
Bugs: #103659
ID: 200508-22

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Synopsis
========

pam_ldap contains a vulnerability that may allow a remote attacker to
gain 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 lt; 180 gt;= 180

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

When a pam_ldap client attempts to authenticate against an LDAP server
that omits the optional error value from the
PasswordPolicyResponseValue, the authentication attempt will always
succeed.

Impact
======

A remote attacker may exploit this vulnerability to bypass the LDAP
authentication mechanism, gaining access to the system possibly with
elevated privileges.

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 "gt;=sys-auth/pam_ldap-180"

References
==========

[ 1 ] CAN-2005-2641
http://www.cve.mitre.org/cgi-bin/cvename.cgi?nameƊN-2005-2641
[ 2 ] US-CERT VU#778916
http://www.kb.cert.org/vuls/id/778916

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

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

http://security.gentoo.org/glsa/glsa-200508-22.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 2005 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/2.0



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