USN-4365-1: Bind vulnerabilities

19 May 2020

Several security issues were fixed in Bind.



  • bind9 - Internet Domain Name Server


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.

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.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04
Ubuntu 19.10
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

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