OpenLDAP is an open source suite of LDAP (Lightweight Directory Access Protocol) applications and development tools.
The nss_ldap module is an extension for use with GNU libc which allows applications to, without internal modification, consult a directory service using LDAP to supplement information that would be read from local files such as /etc/passwd, /etc/group, and /etc/shadow.
A bug was found in the way OpenLDAP, nss_ldap, and pam_ldap refer LDAP servers. If a client connection is referred to a different server, it is possible that the referred connection will not be encrypted even if the client has "ssl start_tls" in its ldap.conf file. The Common Vulnerabilities and Exposures project has assigned the name CAN-2005-2069 to this issue.
A bug was found in the way the pam_ldap module processed certain failure messages. If the server includes supplemental data in an authentication failure result message, but the data does not include any specific error code, the pam_ldap module would proceed as if the authentication request had succeeded, and authentication would succeed. The Common Vulnerabilities and Exposures project has assigned the name CAN-2005-2641 to this issue.
Additionally the following issues are corrected in this erratum.
The OpenLDAP upgrading documentation has been updated.
Fix a database deadlock locking issue.
A fix where slaptest segfaults on exit after successful check.
The library libslapd_db-4.2.so is now located in an architecture-dependent directory.
The LDAP client no longer enters an infinite loop when the server returns a reference to itself.
The pam_ldap module adds the ability to check user passwords using a directory server to PAM-aware applications.
The directory server can now include supplemental information regarding the state of the user's account if a client indicates that it supports such a feature.
All users of OpenLDAP and nss_ldap are advised to upgrade to these updated packages, which contain backported fixes that resolve these issues.