A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a considerable number of non responsive nameservers. The attack starts by querying a resolver for a record that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of time/resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation. This can lead to degraded performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying to resolve the record until hard limits are reached. Based on the nature of the attack and the replies, different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and limiting the number of times a delegation point can issue a cache lookup for missing records.
Published 2022-09-26 14:15:11
Updated 2023-03-29 15:15:07
Source NLnet Labs
View at NVD,   CVE.org
Vulnerability category: Denial of service

Threat overview for CVE-2022-3204

Top countries where our scanners detected CVE-2022-3204
Top open port discovered on systems with this issue 53
IPs affected by CVE-2022-3204 10,222
Threat actors abusing to this issue? Yes
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Exploit prediction scoring system (EPSS) score for CVE-2022-3204

0.39%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 73 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2022-3204

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST

CWE ids for CVE-2022-3204

  • The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2022-3204

Products affected by CVE-2022-3204

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