Red Hat Security Advisory: bind-dyndb-ldap security update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:0683 Final 1 1 2012-05-21T17:01:00Z Current version 2012-05-21T17:01:00Z 2012-05-21T17:01:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-05-21T17:11:02Z 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. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Important https://rhn.redhat.com/errata/RHSA-2012-0683.html https://rhn.redhat.com/errata/RHSA-2012-0683.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/updates/classification/#important Red Hat Enterprise Linux Server (v. 6) Red Hat Enterprise Linux Workstation (v. 6) bind-dyndb-ldap-0.2.0-7.el6_2.1.src.rpm bind-dyndb-ldap-0.2.0-7.el6_2.1 as a component of Red Hat Enterprise Linux Server (v. 6) bind-dyndb-ldap-0.2.0-7.el6_2.1 as a component of Red Hat Enterprise Linux Workstation (v. 6) 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. 2012-04-19T00:00:00Z 2012-04-24T00:00:00Z CVE-2012-2134 6Server-6.2.z:bind-dyndb-ldap-0.2.0-7.el6_2.1 6Workstation-6.2.z:bind-dyndb-ldap-0.2.0-7.el6_2.1 Important 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/knowledge/articles/11258 https://rhn.redhat.com/errata/RHSA-2012-0683.html https://www.redhat.com/security/data/cve/CVE-2012-2134.html CVE-2012-2134 https://bugzilla.redhat.com/show_bug.cgi?id=815846 bz#815846: CVE-2012-2134 bind-dyndb-ldap: Bind DoS (named hang) by processing DNS query for zone served by bind-dyndb-ldap Red Hat would like to thank Ronald van Zantvoort for reporting this issue.