Improper input validation in Knot-Dns Knot DNS
CVE-2017-11104
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.027 (85.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
- Knot-Dns Knot DNS — versions 2.5.0, 2.5.1
- Debian Linux — versions 8.0, 9.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.debian.org/security/2017/dsa-3910 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/99598 (vdb-entry, Broken Link)
- bugs.debian.org/865678 (Third Party Advisory, Issue Tracking)
- www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf (Exploit, Patch, Third Party Advisory, Mitigation)
- lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html (Patch, Mailing List, Third Party Advisory, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html (vendor-advisory, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html (vendor-advisory, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html (vendor-advisory, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.html (vendor-advisory, Broken Link)
Frequently asked questions
- What is CVE-2017-11104?
- CVE-2017-11104 is a medium-severity vulnerability in Knot-Dns Knot DNS, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2017-07-08.
- How severe is CVE-2017-11104?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2017-11104 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.