openldap (SL7)

Synopsis: Moderate: openldap security, bug fix, and enhancement update
Advisory ID: SLSA-2015:2131-3
Issue Date: 2015-11-19
CVE Numbers: CVE-2015-3276

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)

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

* 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

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.

* 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.

* After upgrading the system from Scientific Linux 6 to Scientific 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.

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.


– Scientific Linux Development Team