Posting date: 19 September 2018
Program Impacted: BIND
Versions affected: 9.12.0 -> 9.12.2-P1. Also releases 9.13.0 ->
9.13.3 of the 9.13 development branch
Description:
An unexpected side-effect introduced into the BIND 9.12 branch
during code refactoring causes referrals with non-empty answer
sections to be treated as errors, potentially preventing resolution
of names when it involves referrals from servers providing such
responses.
Impact:
A properly constructed referral should not contain information
in the answer section but prior to the BIND 9.12 branch named
would tolerate such replies if they were otherwise comprehensible
as a referral. Beginning with BIND 9.12.0 such messages were
treated as errors, causing a situation where names which could
be resolved by prior branches of BIND were no longer resolvable
due to the stricter interpretation.
Workarounds: none
Solution: If you are running a version affected by this bug you
can prevent it by upgrading to a release containing the fix which
reverses the change in behavior. The patched version can be
downloaded from http://www.isc.org/downloads/all.
+ BIND 9 version 9.12.2-P2
Do you have Questions? Questions regarding this notification should
go to supp...@isc.org.
Additional information on our Operational Notifications is here:
https://www.isc.org/software/notifications, and Phased Disclosure Process
is here: https://www.isc.org/security-vulnerability-disclosure-policy
Legal Disclaimer:
Internet Systems Consortium (ISC) is providing this notice on
an "AS IS" basis. No warranty or guarantee of any kind is expressed
in this notice and none should be inferred. ISC expressly excludes
and disclaims any warranties regarding this notice or materials
referred to in this notice, including, without limitation, any
implied warranty of merchantability, fitness for a particular
purpose, absence of hidden defects, or of non-infringement. Your
use of, or reliance on, this notice or materials referred to in
this notice is at your own risk. ISC may change this notice at
any time.
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