[USN-3956-2] Bind vulnerability

Leonidas S. Barbosa leo.barbosa at canonical.com
Thu May 9 12:49:56 UTC 2019

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

bind9 vulnerability

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM


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

Software Description:
- bind9: Internet Domain Name Server


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

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

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