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Ubuntu Security Notice USN-4365-2

Ubuntu Security Notice USN-4365-2
Posted May 20, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4365-2 - USN-4365-1 fixed several vulnerabilities in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-8616, CVE-2020-8617
MD5 | 5b0e56c1eabe20b3f39807b88f195a78

Ubuntu Security Notice USN-4365-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4365-2
May 20, 2020

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

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

References:
https://usn.ubuntu.com/4365-2
https://usn.ubuntu.com/4365-1
CVE-2020-8616, CVE-2020-8617
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