Red Hat Enterprise Linux 7: RHSA-2015-2131 Moderate: OpenLDAP Security Fix

OpenLDAP is an open-source suite of Lightweight Directory Access Protocol (LDAP) applications and development tools. LDAP is a set of protocols used to access and maintain distributed directory information services over an IP network. The openldap packages contain configuration files, libraries, and documentation for OpenLDAP.
A flaw was found in the way OpenLDAP parsed OpenSSL-style cipher strings. As a result, OpenLDAP could potentially use ciphers that were not intended to be enabled. (CVE-2015-3276)
This issue was discovered by Martin Poole of the Red Hat Software Maintenance Engineering group.
The openldap packages have been upgraded to upstream version 2.4.40, which provides a number of bug fixes and one enhancement over the previous version:
* The ORDERING matching rules have been added to the ppolicy attribute type descriptions. * The server no longer terminates unexpectedly when processing SRV records. * Missing objectClass information has been added, which enables the user to modify the front-end configuration by standard means.
(BZ#1147982)
This update also fixes the following bugs:
* Previously, OpenLDAP did not properly handle a number of simultaneous updates. As a consequence, sending a number of parallel update requests to the server could cause a deadlock. With this update, a superfluous locking mechanism causing the deadlock has been removed, thus fixing the bug. (BZ#1125152)
* The httpd service sometimes terminated unexpectedly with a segmentation fault on the libldap library unload. The underlying source code has been modified to prevent a bad memory access error that caused the bug to occur. As a result, httpd no longer crashes in this situation. (BZ#1158005)
* After upgrading the system from Red Hat Enterprise Linux 6 to Red Hat Enterprise Linux 7, symbolic links to certain libraries unexpectedly pointed to locations belonging to the openldap-devel package. If the user uninstalled openldap-devel, the symbolic links were broken and the "rpm -V openldap" command sometimes produced errors. With this update, the symbolic links no longer get broken in the described situation. If the user downgrades openldap to version 2.4.39-6 or earlier, the symbolic links might break. After such downgrade, it is recommended to verify that the symbolic links did not break. To do this, make sure the yum-plugin-verify package is installed and obtain the target libraries by running the "rpm -V openldap" or "yum verify openldap" command. (BZ#1230263)
In addition, this update adds the following enhancement:
* OpenLDAP clients now automatically choose the Network Security Services (NSS) default cipher suites for communication with the server. It is no longer necessary to maintain the default cipher suites manually in the OpenLDAP source code. (BZ#1245279)
All openldap users are advised to upgrade to these updated packages, which correct these issues and add this enhancement.