Updated openldap and nss_ldap packages that correct a potential password disclosure issue are now available. This update has been rated as having moderate security impact by the Red Hat Security Response Team.
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 also found in the way certain OpenLDAP authentication schemes store hashed passwords. A remote attacker could re-use a hashed password to gain access to unauthorized resources. The Common Vulnerabilities and Exposures project has assigned the name CAN-2004-0823 to this issue. All users of OpenLDAP and nss_ldap are advised to upgrade to these updated packages, which contain backported fixes that resolve these issues.
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