Synopsis: Important: bind-dyndb-ldap security update
Issue Date: 2012-05-21
CVE Numbers: CVE-2012-2134
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.
– Scientific Linux Development Team