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USN-4737-1: Bind vulnerability

18 February 2021

Bind could be made to crash or run programs if it received specially crafted network traffic.



  • bind9 - Internet Domain Name Server


It was discovered that Bind incorrectly handled GSSAPI security policy
negotiation. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly execute arbitrary code. In
the default installation, attackers would be isolated by the Bind AppArmor

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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


Related notices

  • USN-4737-2: libdns100, libbind9-80, libisccc90, libisc83, libisc95, bind9-doc, bind9-host, host, libisccfg90, bind9, liblwres80, libisccc80, dnsutils, libbind9-90, libisccfg82, libbind-dev, libdns81, liblwres90, bind9utils, lwresd