CVE-2020-8617

Published: 19 May 2020

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
bind9
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.10 (Groovy Gorilla)
Released (1:9.16.1-0ubuntu3)
Ubuntu 20.04 LTS (Focal Fossa)
Released (1:9.16.1-0ubuntu2.1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1:9.11.3+dfsg-1ubuntu1.12)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (1:9.10.3.dfsg.P4-8ubuntu1.16)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1:9.9.5.dfsg-3ubuntu0.19+esm2)