MNBSD-2024-1: Unbound DNSSEC DOS attack

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.

Affected Versions

unbound

Specific versions:

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 3.0.0
• 3.0.1
• 3.0.2
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4

Recommendations

No specific recommendations provided.

References

• https://www.cvedetails.com/cve/CVE-2023-50387/

Additional Information

Aliases: CVE-2023-50387

Published: April 09, 2024
Last Modified: April 09, 2024