By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for
most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contains an error which can be exploited to grow the number of simultaneous connections beyond this limit.

Affected Versions:

BIND 9.9.0 ->9.10.8-P1, 9.11.0 ->9.11.6, 9.12.0 ->9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5.
Versions 9.13.0 ->9.13.7 of the 9.13 development branch are also affected.

Fixed In Version:

bind 9.11.6-P1, bind 9.12.4-P1, bind 9.14.1

References:

https://kb.isc.org/docs/cve-2018-5743
https://www.openwall.com/lists/oss-security/2019/04/25/3

(from redmine: issue id 10371, created on 2019-04-29, closed on 2019-05-03)

• Relations:
  • parent #10366 (closed)
• Changesets:
  • Revision aae4252e by Natanael Copa on 2019-05-03T08:02:54Z:

main/bind: security upgrade to 9.11.6_p1 (CVE-2018-5743,CVE-2019-6467)

This release introduced 3 new tools with python dependency
(dnssec-checkdns, dnssec-coverage and dnssec-keymgr). Move those tools
to a subpackage, bind-dnssec-tools, to avoid unexpectedly pull in python
as dependency for stable upgraders.

There are other tools in bind-tools that belongs to bind-dnssec-tools,
but we dont move those in a stable branch to avoid breaking things for
current users.

Include patch to fix build on non-x86:
https://gitlab.isc.org/isc-projects/bind9/commit/d72f436b7d7c697b262968c48c2d7643069ab17f
https://lists.isc.org/pipermail/bind-users/2019-April/101673.html

fixes #10371