Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a valid key name and algorithm to bypass TSIG authentication if no additional ACL restrictions are set, because of an improper TSIG validity period check.
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html
https://bugs.debian.org/865678
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf
http://www.securityfocus.com/bid/99598
http://www.debian.org/security/2017/dsa-3910
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.html
Source: MITRE
Published: 2017-07-08
Updated: 2023-01-20
Type: CWE-20
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 5.9
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 2.2
Severity: MEDIUM