==========================================================================
Ubuntu Security Notice USN-3346-2
September 18, 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:

 ClA(c)ment 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)
  ClA(c)ment 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

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

References:
  https://www.ubuntu.com/usn/usn-3346-2
  https://www.ubuntu.com/usn/usn-3346-1
  https://launchpad.net/bugs/1717981

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-10.1ubuntu5.2
  https://launchpad.net/ubuntu/+source/bind9/1:9.10.3.dfsg.P4-8ubuntu1.8
  https://launchpad.net/ubuntu/+source/bind9/1:9.9.5.dfsg-3ubuntu0.16