USN-4365-2: Bind vulnerabilities

20 May 2020

bind9 vulnerabilities

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM

Summary

Several security issues were fixed in Bind.

Software Description

  • bind9 - Internet Domain Name Server

Details

USN-4365-1 fixed several vulnerabilities in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

Original advisory 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)

Update instructions

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

Ubuntu 14.04 ESM
bind9 - 1:9.9.5.dfsg-3ubuntu0.19+esm2
Ubuntu 12.04 ESM
bind9 - 1:9.8.1.dfsg.P1-4ubuntu0.30

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References