Red Hat Security Advisory 2015-2455-01 - The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. A denial of service flaw was found in unbound that an attacker could use to trick the unbound resolver into following an endless loop of delegations, consuming an excessive amount of resources. Prior to this update, there was a mistake in the time configuration in the cron job invoking unbound-anchor to update the root zone key. Consequently, unbound-anchor was invoked once a month instead of every day, thus not complying with RFC 5011. The cron job has been replaced with a systemd timer unit that is invoked on a daily basis. Now, the root zone key validity is checked daily at a random time within a 24-hour window, and compliance with RFC 5011 is ensured. Continue reading...
