Ubuntu Security Notice 3956-2 - USN-3956-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. 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. Various other issues were also addressed.
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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