=========================================================================Ubuntu Security Notice USN-3893-1
February 22, 2019

bind9 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Toshifumi Sakaguchi discovered that Bind incorrectly handled memory. A
remote attacker could possibly use this issue to cause Bind to consume
resources, leading to a denial of service. This issue only affected Ubuntu
18.04 LTS and Ubuntu 18.10. (CVE-2018-5744)

It was discovered that Bind incorrectly handled certain trust anchors when
used with the "managed-keys" feature. A remote attacker could possibly use
this issue to cause Bind to crash, resulting in a denial of service.
(CVE-2018-5745)

It was discovered that Bind incorrectly handled certain controls for zone
transfers, contrary to expectations. (CVE-2019-6465)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
  bind9                           1:9.11.4+dfsg-3ubuntu5.1

Ubuntu 18.04 LTS:
  bind9                           1:9.11.3+dfsg-1ubuntu1.5

Ubuntu 16.04 LTS:
  bind9                           1:9.10.3.dfsg.P4-8ubuntu1.12

Ubuntu 14.04 LTS:
  bind9                           1:9.9.5.dfsg-3ubuntu0.19

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-3893-1
  CVE-2018-5744, CVE-2018-5745, CVE-2019-6465

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.11.4+dfsg-3ubuntu5.1
  https://launchpad.net/ubuntu/+source/bind9/1:9.11.3+dfsg-1ubuntu1.5
  https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.12
  https://launchpad.net/ubuntu/+source/bind9/1:9.9.5.dfsg-3ubuntu0.19