USN-4365-2: Bind vulnerabilities

USN-4365-2: Bind vulnerabilities

bind9 vulnerabilities

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

• Ubuntu 14.04 ESM
• Ubuntu 12.04 ESM

Summary

Several security issues were fixed in Bind.

Software Description

• bind9 – Internet Domain Name Server

Details

USN-4365-1 fixed several vulnerabilities in Bind. This update provides
the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.
Original advisory details:

Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind
incorrectly limited certain fetches. A remote attacker could possibly use
this issue to cause Bind to consume resources, leading to a denial of
service, or possibly use Bind to perform a reflection attack.
(CVE-2020-8616)

Tobias Klein discovered that Bind incorrectly handled checking TSIG
validity. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly perform other attacks.
(CVE-2020-8617)

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+esm2

Ubuntu 12.04 ESM

bind9 – 1:9.8.1.dfsg.P1-4ubuntu0.30

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

• USN-4365-1
• CVE-2020-8616
• CVE-2020-8617

Source: USN-4365-2: Bind vulnerabilities