CVE-2023-50387
HIGH severity · CVSS 7.5 · Resource exhaustion
7.5CVSS HIGH
Summary
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)100%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 ↗
Additional information
- NVD record
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1Patch
- http://www.openwall.com/lists/oss-security/2024/02/16/2
- http://www.openwall.com/lists/oss-security/2024/02/16/3
- https://access.redhat.com/security/cve/CVE-2023-50387Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1219823
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.htmlAdvisory
- https://kb.isc.org/docs/cve-2023-50387Advisory
- https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html