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Vulnerability of ISC BIND: denial of service via TCP-pipelined Queries Tcp-clients Limit Bypass

Synthesis of the vulnerability 

An attacker can trigger a fatal error via TCP-pipelined Queries Tcp-clients Limit Bypass of ISC BIND, in order to trigger a denial of service.
Vulnerable software: Debian, BIND, openSUSE Leap, Solaris, RHEL, Slackware, SLES, Ubuntu.
Severity of this announce: 3/4.
Creation date: 21/11/2019.
Références of this computer vulnerability: bulletinapr2020, CERTFR-2019-AVI-585, CVE-2019-6477, DSA-4689-1, openSUSE-SU-2020:1699-1, openSUSE-SU-2020:1701-1, RHSA-2020:1061-01, RHSA-2020:1845-01, SSA:2019-324-01, SUSE-SU-2020:2914-1, USN-4197-1, VIGILANCE-VUL-30919.

Description of the vulnerability 

An attacker can trigger a fatal error via TCP-pipelined Queries Tcp-clients Limit Bypass of ISC BIND, in order to trigger a denial of service.
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This computer vulnerability note impacts software or systems such as Debian, BIND, openSUSE Leap, Solaris, RHEL, Slackware, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability announce is important.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this cybersecurity announce.

Solutions for this threat 

ISC BIND: version 9.14.8.
The version 9.14.8 is fixed:
  https://www.isc.org/download/

ISC BIND: version 9.11.13.
The version 9.11.13 is fixed:
  https://www.isc.org/download/

ISC BIND: workaround for TCP-pipelined Queries Tcp-clients Limit Bypass.
A workaround is to disable TCP-pipelined Queries :
  keep-response-order { any; };

Debian 9-10: new bind9 packages.
New packages are available:
  Debian 9: bind9 1:9.10.3.dfsg.P4-12.3+deb9u6
  Debian 10: bind9 1:9.11.5.P4+dfsg-5.1+deb10u1

openSUSE Leap 15.1: new bind packages.
New packages are available:
  openSUSE Leap 15.1: bind 9.16.6-lp151.11.9.1

openSUSE Leap 15.2: new bind packages.
New packages are available:
  openSUSE Leap 15.2: bind 9.16.6-lp152.14.3.1

Oracle Solaris: patch for third party software of April 2020 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 7: new bind packages.
New packages are available:
  RHEL 7.0-7.7: bind 9.11.4-16.P2.el7

RHEL 8: new bind packages.
New packages are available:
  RHEL 8.0-8.1: bind 9.11.13-3.el8

Slackware: new bind packages.
New packages are available:
  Slackware 14.0: bind 9.11.13-*-1_slack14.0
  Slackware 14.1: bind 9.11.13-*-1_slack14.1
  Slackware 14.2: bind 9.11.13-*-1_slack14.2

SUSE LE 15: new bind packages.
New packages are available:
  SUSE LE 15 RTM: bind 9.16.6-12.32.1
  SUSE LE 15 SP1: bind 9.16.6-12.32.1
  SUSE LE 15 SP2: bind 9.16.6-12.32.1

Ubuntu: new bind9 packages.
New packages are available:
  Ubuntu 19.10: bind9 1:9.11.5.P4+dfsg-5.1ubuntu2.1
  Ubuntu 19.04: bind9 1:9.11.5.P1+dfsg-1ubuntu2.6
  Ubuntu 18.04 LTS: bind9 1:9.11.3+dfsg-1ubuntu1.11
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