RHEL 5 : openldap (RHSA-2010:0198)

This script is Copyright (C) 2010-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated openldap packages that fix one security issue and several bugs
are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
moderate security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from
the CVE link in the References section.

OpenLDAP is an open source suite of LDAP (Lightweight Directory Access
Protocol) applications and development tools.

A flaw was found in the way OpenLDAP handled NUL characters in the
CommonName field of X.509 certificates. An attacker able to get a
carefully-crafted certificate signed by a trusted Certificate
Authority could trick applications using OpenLDAP libraries into
accepting it by mistake, allowing the attacker to perform a
man-in-the-middle attack. (CVE-2009-3767)

This update also fixes the following bugs :

* the ldap init script did not provide a way to alter system limits
for the slapd daemon. A variable is now available in
'/etc/sysconfig/ldap' for this option. (BZ#527313)

* applications that use the OpenLDAP libraries to contact a Microsoft
Active Directory server could crash when a large number of network
interfaces existed. This update implements locks in the OpenLDAP
library code to resolve this issue. (BZ#510522)

* when slapd was configured to allow client certificates,
approximately 90% of connections froze because of a large CA
certificate file and slapd not checking the success of the SSL
handshake. (BZ#509230)

* the OpenLDAP server would freeze for unknown reasons under high
load. These packages add support for accepting incoming connections by
new threads, resolving the issue. (BZ#507276)

* the compat-openldap libraries did not list dependencies on other
libraries, causing programs that did not specifically specify the
libraries to fail. Detection of the Application Binary Interface (ABI)
in use on 64-bit systems has been added with this update. (BZ#503734)

* the OpenLDAP libraries caused applications to crash due to an
unprocessed network timeout. A timeval of -1 is now passed when NULL
is passed to LDAP. (BZ#495701)

* slapd could crash on a server under heavy load when using rwm
overlay, caused by freeing non-allocated memory during operation
cleanup. (BZ#495628)

* the ldap init script made a temporary script in '/tmp/' and
attempted to execute it. Problems arose when '/tmp/' was mounted with
the noexec option. The temporary script is no longer created.
(BZ#483356)

* the ldap init script always started slapd listening on ldap:/// even
if instructed to listen only on ldaps:///. By correcting the init
script, a user can now select which ports slapd should listen on.
(BZ#481003)

* the slapd manual page did not mention the supported options -V and
-o. (BZ#468206)

* slapd.conf had a commented-out option to load the syncprov.la
module. Once un-commented, slapd crashed at start-up because the
module had already been statically linked to OpenLDAP. This update
removes 'moduleload syncprov.la' from slapd.conf, which resolves this
issue. (BZ#466937)

* the migrate_automount.pl script produced output that was unsupported
by autofs. This is corrected by updating the output LDIF format for
automount records. (BZ#460331)

* the ldap init script uses the TERM signal followed by the KILL
signal when shutting down slapd. Minimal delay between the two signals
could cause the LDAP database to become corrupted if it had not
finished saving its state. A delay between the signals has been added
via the 'STOP_DELAY' option in '/etc/sysconfig/ldap'. (BZ#452064)

* the migrate_passwd.pl migration script had a problem when number
fields contained only a zero. Such fields were considered to be empty,
leading to the attribute not being set in the LDIF output. The
condition in dump_shadow_attributes has been corrected to allow for
the attributes to contain only a zero. (BZ#113857)

* the migrate_base.pl migration script did not handle third level
domains correctly, creating a second level domain that could not be
held by a database with a three level base. This is now allowed by
modifying the migrate_base.pl script to generate only one domain.
(BZ#104585)

Users of OpenLDAP should upgrade to these updated packages, which
resolve these issues.

See also :

https://www.redhat.com/security/data/cve/CVE-2009-3767.html
http://rhn.redhat.com/errata/RHSA-2010-0198.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.9
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 46284 ()

Bugtraq ID: 36844

CVE ID: CVE-2009-3767