CVE-2022-40188

Published: 23 September 2022

Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
knot-resolver Launchpad, Ubuntu, Debian	bionic	Released (2.1.1-1ubuntu0.1~esm2) Available with Ubuntu Pro
	focal	Released (3.2.1-3ubuntu2.1)
	jammy	Released (5.4.4-1ubuntu0.1~esm1) Available with Ubuntu Pro
	kinetic	Released (5.5.1-5ubuntu0.22.10.1)
	lunar	Not vulnerable (5.6.0-1)
	trusty	Ignored (end of standard support)
	upstream	Released (5.5.3-1)
	xenial	Released (1.0.0~beta3-1ubuntu0.1~esm1) Available with Ubuntu Pro
	Patches: upstream: https://github.com/CZ-NIC/knot-resolver/commit/f6577a20e493c7fbdac124d7544bf1846b084185

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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