Problem Description:

When named(8) receives a specially crafted dynamic update message an internal assertion check is triggered which causes named(8) to exit.

To trigger the problem, the dynamic update message must contains a record of type "ANY" and at least one resource record set (RRset) for this fully qualified domain name (FQDN) must exist on the server.

Impact:

An attacker which can send DNS requests to a nameserver can cause it to exit, thus creating a Denial of Service situation.

Workaround:

No generally applicable workaround is available, but some firewalls may be able to prevent nsupdate DNS packets from reaching the nameserver.

NOTE WELL: Merely configuring named(8) to ignore dynamic updates is NOT sufficient to protect it from this vulnerability.

< 9.3.6.1.1

< 9.4.3.3

>= 6.3 lt 6.3_12

>= 6.4 lt 6.4_6

>= 7.1 lt 7.1_7

>= 7.2 lt 7.2_3