RHEL 6 : bind-dyndb-ldap (RHSA-2012:0683)

This script is Copyright (C) 2012-2014 Tenable Network Security, Inc.


Synopsis :

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

Description :

An updated bind-dyndb-ldap package that fixes one security issue is
now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
important 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.

The dynamic LDAP back end is a plug-in for BIND that provides back-end
capabilities to LDAP databases. It features support for dynamic
updates and internal caching that help to reduce the load on LDAP
servers.

A flaw was found in the way bind-dyndb-ldap handled LDAP query errors.
If a remote attacker were able to send DNS queries to a named server
that is configured to use bind-dyndb-ldap, they could trigger such an
error with a DNS query leveraging bind-dyndb-ldap's insufficient
escaping of the LDAP base DN (distinguished name). This would result
in an invalid LDAP query that named would retry in a loop, preventing
it from responding to other DNS queries. With this update,
bind-dyndb-ldap only attempts to retry one time when an LDAP search
returns an unexpected error. (CVE-2012-2134)

Red Hat would like to thank Ronald van Zantvoort for reporting this
issue.

All bind-dyndb-ldap users should upgrade to this updated package,
which contains a backported patch to correct this issue. For the
update to take effect, the named service must be restarted.

See also :

https://www.redhat.com/security/data/cve/CVE-2012-2134.html
http://rhn.redhat.com/errata/RHSA-2012-0683.html

Solution :

Update the affected bind-dyndb-ldap and / or bind-dyndb-ldap-debuginfo
packages.

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.6
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 59224 ()

Bugtraq ID: 53236

CVE ID: CVE-2012-2134