CVE-2017-11104

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-07-08 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

Debian Linux: 8.0, 9.0, 10.0
Knot-Dns Knot Dns: through 2.4.4; 2.5.0, 2.5.1

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.html
http://www.debian.org/security/2017/dsa-3910
http://www.securityfocus.com/bid/99598
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf
https://bugs.debian.org/865678
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html

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