Ubuntu 20.04 LTS: USN-4365-1 Critical: Bind DoS Security Advisory

ubuntu

May 19, 2020

Several security issues were fixed in Bind.

Summary

Several security issues were fixed in Bind.

Software Description:

- bind9: Internet Domain Name Server

Details:

Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind

incorrectly limited certain fetches. A remote attacker could possibly use

this issue to cause Bind to consume resources, leading to a denial of

service, or possibly use Bind to perform a reflection attack.

(CVE-2020-8616)

Tobias Klein discovered that Bind incorrectly handled checking TSIG

validity. A remote attacker could use this issue to cause Bind to crash,

resulting in a denial of service, or possibly perform other attacks.

(CVE-2020-8617)

Topics Covered

security advisory DoS Ubuntu service crash resource consumption Bind reflective attack

Update Instructions

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

Ubuntu 20.04 LTS:
  bind9                           1:9.16.1-0ubuntu2.1

Ubuntu 19.10:
  bind9                           1:9.11.5.P4+dfsg-5.1ubuntu2.2

Ubuntu 18.04 LTS:
  bind9                           1:9.11.3+dfsg-1ubuntu1.12

Ubuntu 16.04 LTS:
  bind9                           1:9.10.3.dfsg.P4-8ubuntu1.16

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