(RHSA-2005:767) openldap and nss_ldap security update

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.