BIND under attack

From OpenBSD officially’s site:

A vulnerability has been found in BIND’s named server (CVE-2009-0696). An attacker could crash a server with a specially crafted dynamic update message to a zone for which the server is master.

patch

From ISC (Internet Systems Consortium):

Urgent: this exploit is public. Please upgrade immediately.

Receipt of a specially-crafted dynamic update message to a zone for which the server is the master may cause BIND 9 servers to exit. Testing indicates that the attack packet has to be formulated against a zone for which that machine is a master. Launching the attack against slave zones does not trigger the assert.

This vulnerability affects all servers that are masters for one or more zones – it is not limited to those that are configured to allow dynamic updates. Access controls will not provide an effective workaround.

dns_db_findrdataset() fails when the prerequisite section of the dynamic update message contains a record of type “ANY” and where at least one RRset for this FQDN exists on the server.

db.c:659: REQUIRE(type != ((dns_rdatatype_t)dns_rdatatype_any)) failed
exiting (due to assertion failure).

Workarounds:
None.
Active exploits:
An active remote exploit is in wide circulation at this time.
Solution:
Upgrade BIND to one of 9.4.3-P3, 9.5.1-P3 or 9.6.1-P1. These versions can be downloaded from:
http://ftp.isc.org/isc/bind9/9.6.1-P1/bind-9.6.1-P1.tar.gz
http://ftp.isc.org/isc/bind9/9.5.1-P3/bind-9.5.1-P3.tar.gz
http://ftp.isc.org/isc/bind9/9.4.3-P3/bind-9.4.3-P3.tar.gz