Vulnerability-Lookup

RHSA-2023:2370

Vulnerability from csaf_opensuse - Published: 2023-05-09 00:00 - Updated: 2026-09-20 11:28

Summary

security update for unbound

Severity

Low

Notes

Title of the patch: security update for unbound

Description of the patch: This security update provides a functional equivalent of RHSA-2023:2370. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2023:2370.

Patchnames: RHSA-2023:2370

CVE-2022-3204

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 6 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 9:python3-unbound-0:1.16.2-3.el9.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:unbound-0:1.16.2-3.el9.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:unbound-devel-0:1.16.2-3.el9.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:unbound-devel-0:1.16.2-3.el9.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:unbound-libs-0:1.16.2-3.el9.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 9:unbound-libs-0:1.16.2-3.el9.x86_64	—	Vendor Fix

Threats

Impact important

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://www.suse.com/security/cve/CVE-2022-3204/	self
https://www.suse.com/security/cve/CVE-2022-3204	external
https://bugzilla.suse.com/1203643	external

JSON

To clipboard

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        {
          "category": "general",
          "text": "A vulnerability named \u0027Non-Responsive Delegation Attack\u0027 (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.",
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      "title": "CVE-2022-3204"
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  ]
}

CVE-2022-3204 (GCVE-0-2022-3204)

Vulnerability from cvelistv5 – Published: 2022-09-26 13:41 – Updated: 2025-05-05 16:13

Title

NRDelegation Attack

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 13:26 UTC

CWE

n/a
CWE-400 - Uncontrolled Resource Consumption

Assigner

NLnet Labs Scorecard

References

6 references

URL	Tags
https://www.nlnetlabs.nl/downloads/unbound/CVE-20…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://security.gentoo.org/glsa/202212-02	vendor-advisory
https://lists.debian.org/debian-lts-announce/2023…	mailing-list

Impacted products

1 product

Vendor	Product	Version
NLnet Labs	Unbound	Affected: unspecified , ≤ 1.16.2 (custom)

Date Public

2022-09-21 00:00

Credits

We would like to thank Yehuda Afek from Tel-Aviv University, Anat Bremler-Barr and Shani Stajnrod from Reichman University for discovering and disclosing the vulnerability.

Show details on NVD website

JSON

To clipboard

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        {
          "lang": "en",
          "value": "A vulnerability named \u0027Non-Responsive Delegation Attack\u0027 (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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-03-29T00:00:00.000Z",
        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
      },
      "references": [
        {
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-3204.txt"
        },
        {
          "name": "FEDORA-2022-1326d2815c",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3G2HS6CYPSIGAKO6QLEZPG3RD6AMPB7B/"
        },
        {
          "name": "FEDORA-2022-164cf7837e",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35QGS5FBQTG3DBSK7QV67PA64P24ABHY/"
        },
        {
          "name": "FEDORA-2022-204ee3da84",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4EU6DMJXQFMAIE6SLAH4H5RNRU6VQL/"
        },
        {
          "name": "GLSA-202212-02",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202212-02"
        },
        {
          "name": "[debian-lts-announce] 20230329 [SECURITY] [DLA 3371-1] unbound security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html"
        }
      ],
      "title": "NRDelegation Attack"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2022-3204",
    "datePublished": "2022-09-26T13:41:46.275Z",
    "dateReserved": "2022-09-13T00:00:00.000Z",
    "dateUpdated": "2025-05-05T16:13:06.842Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

RHSA-2023:2370

CVE-2022-3204 (GCVE-0-2022-3204)

Tags

Sightings

Nomenclature

Related by attack behaviour