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==========================================================================
Ubuntu Security Notice USN-3346-3
November 08, 2017

bind9 vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Bind could be made to serve incorrect information or expose sensitive
information over the network.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-3346-1 and USN-3346-2 fixed two vulnerabilities in Bind and a
regression, respectively. This update provides the corresponding update
for Ubuntu 12.04 ESM.

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)

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

Update instructions:

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

Ubuntu 12.04 ESM:
 
 bind9                           1:9.8.1.dfsg.P1-4ubuntu0.23

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

References:
  https://www.ubuntu.com/usn/usn-3346-3
  https://www.ubuntu.com/usn/usn-3346-1
  CVE-2017-3142, CVE-2017-3143

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