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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

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
knot-resolver
Launchpad, Ubuntu, Debian
kinetic
Released (5.5.1-5ubuntu0.22.10.1)
trusty Ignored
(end of standard support)
upstream
Released (5.5.3-1)
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
xenial
Released (1.0.0~beta3-1ubuntu0.1~esm1)
Available with Ubuntu Pro
lunar Not vulnerable
(5.6.0-1)
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