CVE Catalog

CVE-2023-50868

High
Published: Translated: NVD NIST

Summary

A vulnerability in the DNS protocol, related to the Closest Encloser Proof aspect in RFC 5155 (when RFC 9276 guidance is skipped), allows remote attackers to cause a denial of service (DoS) by triggering excessive CPU consumption for SHA-1 computations. The attack involves sending DNSSEC responses in a random subdomain attack, known as the NSEC3 issue.

Risk Assessment

The organization faces the risk of DNS server overload, potentially leading to network service unavailability and disruptions in IT infrastructure operations.

Recommendation

It is recommended to update DNS software to a version that implements RFC 9276 guidance and to deploy rate limiting for DNSSEC queries to mitigate the attack risk.

Related vulnerabilities

Original NVD description (English source)

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification imp

Vulnerability data from NVD (NIST) · CISA KEV · EPSS