CVE-2023-50387 — KeyTrap: Allocation of Resources Without Limits or Throttling in Knot Resolver
Severity
7.5HIGHNVD
EPSS
52.0%
top 2.08%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedFeb 14
Latest updateApr 24
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6
Affected Packages14 packages
Also affects: Fedora 39, Enterprise Linux 6.0, 7.0, 8.0, 9.0
Patches
🔴Vulnerability Details
9🔍Detection Rules
1Suricata▶
ET HUNTING - DNS Response containing multiple DNSSEC RRSIG Entries (Algorithm 14) - Possible CVE-2023-50387 Activity↗2024-02-20