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CVE-2020-12667

Published: 19 May 2020

Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
knot-resolver
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life)
trusty Does not exist

bionic Needed

upstream
Released (5.1.1)
xenial Needed

impish Not vulnerable
(5.1.1-0.1ubuntu1)
focal Needed

groovy Not vulnerable
(5.1.1-0.1ubuntu1)
hirsute Not vulnerable
(5.1.1-0.1ubuntu1)
jammy Not vulnerable
(5.1.1-0.1ubuntu1)
kinetic Not vulnerable
(5.1.1-0.1ubuntu1)
lunar Not vulnerable
(5.1.1-0.1ubuntu1)
mantic Not vulnerable
(5.1.1-0.1ubuntu1)
Patches:
upstream: https://gitlab.nic.cz/knot/knot-resolver/-/commit/ba7b89db780fe3884b4e90090318e25ee5afb118
upstream: https://gitlab.nic.cz/knot/knot-resolver/-/commit/54f05e4d7b2e47c0bdd30b84272fc503cc65304b

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