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Category:   Application (Directory)  >   OpenLDAP Vendors:   OpenLDAP.org
OpenLDAP Forwarding Error May Let Remote Users Bypass Authentication for External Applications
SecurityTracker Alert ID:  1025188
SecurityTracker URL:  http://securitytracker.com/id/1025188
CVE Reference:   CVE-2011-1024   (Links to External Site)
Date:  Mar 10 2011
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.2.24
Description:   A vulnerability was reported in OpenLDAP. A remote user may be able to bypass authentication for external applications.

When the system is configured with a chain overlay on the frontend and with ppolicy with ppolicy_forward_updates, the system will accept bind operations with invalid credentials. If an OpenLDAP slave receives an authenticated bind request with an invalid password that was forwarded to the master LDAP server, the LDAP slave will return a successful bind (as an anonymous user).

A remote user may be able login to external applications (e.g., pam_ldap, SSSD) using an invalid password.

Impact:   A remote user may be able login to external applications (e.g., pam_ldap, SSSD) using an invalid password.
Solution:   The vendor has issued a fix (2.4.24).

The source code fix is available at:

http://www.openldap.org/devel/cvsweb.cgi/servers/slapd/back-ldap/chain.c.diff?r1=1.76&r2=1.77&hideattic=1&sortbydate=0

Vendor URL:  www.openldap.org/its/index.cgi/Software Bugs?id=6607 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 10 2011 (Red Hat Issues Fix) OpenLDAP Forwarding Error May Let Remote Users Bypass Authentication for External Applications
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Mar 11 2011 (Red Hat Issues Fix) OpenLDAP Forwarding Error May Let Remote Users Bypass Authentication for External Applications
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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