[ GLSA 200508-22 ] pam_ldap: Authentication bypass vulnerability
From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200508-22 ] pam_ldap: Authentication bypass vulnerability
Date: Wed, 31 Aug 2005 16:36:37 +0200
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Organization: Gentoo Linux Security Team
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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 < 180 >= 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 ">=sys-auth/pam_ldap-180"
References
==========
[ 1 ] CAN-2005-2641
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-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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