CVE-2017-11104

MEDIUM

Knot DNS < 2.4.5 and 2.5.x < 2.5.2 - TSIG Authentication Bypass via Improper Validity Period Check

Title source: llm
STIX 2.1

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.

References (9)

Core 9
Core References
Third Party Advisory vendor-advisory x_refsource_debian
http://www.debian.org/security/2017/dsa-3910
Broken Link vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/99598
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugs.debian.org/865678
Exploit, Mitigation, Patch, Third Party Advisory x_refsource_misc
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf
Broken Link, Mailing List, Patch, Third Party Advisory x_refsource_misc
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html

Scores

CVSS v3 5.9
EPSS 0.0268
EPSS Percentile 84.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-20
Status published
Products (6)
debian/debian_linux 8.0
debian/debian_linux 9.0
debian/debian_linux 10.0
knot-dns/knot_dns 2.5.0
knot-dns/knot_dns 2.5.1
knot-dns/knot_dns < 2.4.4
Published Jul 08, 2017
Tracked Since Feb 18, 2026