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CVE-2021-40083

Published: 25 August 2021

Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof).

Notes

AuthorNote
ccdm94
this issue seems to have been introduced by commit 7107faeb
(5.3.1). Therefore, versions that do not include this commit
will not be vulnerable.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
knot-resolver
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
impish Ignored
(end of life)
kinetic Not vulnerable
(5.5.1-5)
lunar Not vulnerable
(5.6.0-1)
trusty Does not exist

xenial Not vulnerable
(code not present)
upstream
Released (5.3.2)
hirsute Ignored
(end of life)
jammy Not vulnerable
(5.4.4-1)
Patches:
upstream: https://gitlab.nic.cz/knot/knot-resolver/-/commit/97ec93e178207699f438a8300eecabc2654ae76f

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