CVE-2020-8622

Publication date 20 August 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bind9	20.04 LTS focal	Fixed 1:9.16.1-0ubuntu2.3
	18.04 LTS bionic	Fixed 1:9.11.3+dfsg-1ubuntu1.13
	16.04 LTS xenial	Fixed 1:9.10.3.dfsg.P4-8ubuntu1.17
	14.04 LTS trusty	Fixed 1:9.9.5.dfsg-3ubuntu0.19+esm3 Ubuntu Pro

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Notes

alexmurray

Affects versions 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND Supported Preview Edition

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H