[3.8] bind: Multiple vulnerabilities (CVE-2018-5736, CVE-2018-5737)

CVE-2018-5736: Multiple transfers of a zone in quick succession can cause an assertion failure in rbtdb.c

An error in zone database reference counting can lead to an assertion failure if a server which is running an
affected version of BIND attempts several transfers of a slave zone in quick succession.

This defect could be deliberately exercised by an attacker who is permitted to cause a vulnerable server to initiate zone
transfers (for example: by sending valid NOTIFY messages), causing the named process to exit after failing the assertion test.

Affected versions:

9.12.0 and 9.12.1

Reference:

https://kb.isc.org/article/AA-01602/74/CVE-2018-5736%3A-Multiple-transfers-of-a-zone-in-quick-succession-can-cause-an-assertion-failure-in-rbtdb.c.html

Patch:

https://ftp.isc.org/isc/bind9/9.12.1-P2/patches/cve5736.patch

CVE-2018-5737: BIND 9.12’s serve-stale implementation can cause an assertion failure in rbtdb.c or other undesirable behavior, even if serve-stale is not enabled.

A problem with the implementation of the new serve-stale feature in BIND 9.12 can lead to an assertion failure in rbtdb.c,
even when stale-answer-enable is off. Additionally, problematic interaction between the serve-stale feature and NSEC aggressive
negative caching can in some cases cause undesirable behavior from named, such as a recursion loop or excessive logging.

Affected versions:

9.12.0 and 9.12.1

Reference:

https://kb.isc.org/article/AA-01606/74/CVE-2018-5737%3A-BIND-9.12s-serve-stale-implementation-can-cause-an-assertion-failure-in-rbtdb.c-or-other-undesirable-behavior-even-if-serve-stale-is-not-enabled.html

Patch:

https://ftp.isc.org/isc/bind9/9.12.1-P2/patches/cve5737.patch

(from redmine: issue id 8922, created on 2018-05-21, closed on 2018-05-22)