7.5 - RHSA-2005:767

Problem Description:

Updated openldap and nss_ldap packages that correct a potential password disclosure issue and possible authentication vulnerability are now available.
This update has been rated as having moderate security impact by the Red Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64 Red Hat Enterprise Linux Desktop version 4 - i386, x86_64 Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64 Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Problem description:

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.

4. Solution:

Before applying this update, make sure that all previously-released errata relevant to your system have been applied. Use Red Hat Network to download and update your packages. To launch the Red Hat Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the following Web page for the System Administration or Customization guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

159151 - Authconfig update creates a problem with OpenLDAP server 162482 - CAN-2005-2069 openldap password disclosure issue 166163 - CAN-2005-2641 pam_ldap policy vulnerability