USN-4365-1: Bind vulnerabilities

Releases

• Ubuntu 20.04 LTS
• Ubuntu 19.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• bind9 - Internet Domain Name Server

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 20.04

• bind9 - 1:9.16.1-0ubuntu2.1

Ubuntu 19.10

• bind9 - 1:9.11.5.P4+dfsg-5.1ubuntu2.2

Ubuntu 18.04

• bind9 - 1:9.11.3+dfsg-1ubuntu1.12

Ubuntu 16.04

• bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.16

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

References

• CVE-2020-8616
• CVE-2020-8617

Related notices

• USN-4365-2: libisc95, lwresd, libbind9-90, dnsutils, libisccfg90, libdns100, liblwres80, libisccc80, libbind9-80, bind9-doc, bind9-host, host, bind9utils, libdns81, liblwres90, libisccfg82, libbind-dev, libisccc90, bind9, libisc83