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Ubuntu Security Notice USN-3956-2
May 09, 2019

bind9 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Bind could be made to consume resources if it received specially
crafted network traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-3956-1 fixed a vulnerability in Bind. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

 It was discovered that Bind incorrectly handled limiting the number of
 simultaneous TCP clients. A remote attacker could possibly use this
 issue to cause Bind to consume resources, leading to a denial of
 service.

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+esm1

Ubuntu 12.04 ESM:
  bind9                           1:9.8.1.dfsg.P1-4ubuntu0.28

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

References:
  https://usn.ubuntu.com/usn/usn-3956-2
  https://usn.ubuntu.com/usn/usn-3956-1
  CVE-2018-5743