PT-2021-22793 · Unknown+1 · Knot Resolver+1

Vladimír Čunát · Published 2021-05-18 · Updated 2021-08-30 · CVE-2021-40083

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Knot Resolver versions prior to 5.3.2

Description The issue is related to an assertion failure that can be triggered by a remote attacker in a specific edge case, involving NSEC3 with too many iterations used for a positive wildcard proof.

Recommendations For versions prior to 5.3.2, update to version 5.3.2 or later to resolve the issue.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

ALT-PU-2021-1818

CVE-2021-40083

Affected Products

Alt Linux

Knot Resolver

References · 8

• https://osv.dev/vulnerability/DEBIAN-CVE-2021-40083 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-40083 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-40083 · Vendor Advisory
• https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1169 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-40083 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-40083 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-40083 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-40083 · Security Note