USN-3346-2: Bind regression

18 September 2017

bind9 regression

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

  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

USN-3346-1 introduced a regression in Bind.

Software Description

  • bind9 - Internet Domain Name Server

Details

USN-3346-1 fixed vulnerabilities in Bind. The fix for CVE-2017-3142 introduced a regression in the ability to receive an AXFR or IXFR in the case where TSIG is used and not every message is signed. This update fixes the problem.

In addition, this update adds the new root zone key signing key (KSK).

Original advisory details:

Clément Berthaux discovered that Bind did not correctly check TSIG authentication for zone update requests. An attacker could use this to improperly perform zone updates. (CVE-2017-3143)

Clément Berthaux discovered that Bind did not correctly check TSIG authentication for zone transfer requests. An attacker could use this to improperly transfer entire zones. (CVE-2017-3142)

Update instructions

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

Ubuntu 17.04
bind9 - 1:9.10.3.dfsg.P4-10.1ubuntu5.2
Ubuntu 16.04 LTS
bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.8
Ubuntu 14.04 LTS
bind9 - 1:9.9.5.dfsg-3ubuntu0.16

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

After a standard system update you need to restart Bind to make all the necessary changes.

References