Enterprise Linux Log

Aug 28 2007   7:24AM GMT

BIND security update, end of life for version 8.0


There are a couple of BIND notifications and updates this morning that I thought I’d share with you. The first is a security notification from the Internet Systems Consortium, which oversees the BIND project.

I. Description: ISC (Internet Systems Consortium) BIND 8 generates cryptographically weak DNS query IDs which could allow a remote attacker to poison DNS caches.

This bug only affects outgoing queries, generated by BIND 8 to answer questions as a resolver, or when it is looking up data for internal uses, such as when sending NOTIFYs to slave name servers.

From the ISC Bind security page:

“The DNS query id generation is vulnerable to analysis which provides a high chance of guessing the next query id. This can be used to perform cache poisoning by an attacker.”

All users are encouraged to upgrade (see below — jack)

II. Impact: A remote attacker could predict DNS query IDs and respond with arbitrary answers, thus poisoning DNS caches.

III. Solution: Upgrade or Patch

This issue is addressed in ISC BIND 8.4.7-P1, available as patch that can be applied to BIND 8.4.7.

The more definitive solution is to upgrade to BIND 9. BIND 8 is being declared “end of life” by ISC due to multiple architectural issues. Please see ISC’s website at www.isc.org/sw/bind/bind8-eol.php for additional information and tools. Note that BIND 8.x.x is End of Life as of August 2007.

On that lat note, we have an end of life update (re: 2008 ) from ISC about BIND 8.

Due to the continuing level of effort required to support BIND 8, ISC has decided to change the status of BIND 8 to ‘end of life’.

ISC strongly encourages users who depend on BIND 8 to migrate to BIND 9 as soon as possible.

It’s never easy to retire a product. The security issues of BIND 8 are many, and 7 years after the release of BIND 9, ISC must devote our efforts to maintaining and enhancing the current version. BIND 9 was always intended as a replacement for BIND 8, thus there are no more BIND 8 releases planned beyond 8.4.7-P1, being released today.

Please see ISC’s website at http://www.isc.org/sw/bind/bind8-eol.php for additional information and migration tools.

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