CVE-2022-30698 (GCVE-0-2022-30698)

Vulnerability from cvelistv5 – Published: 2022-08-01 14:13 – Updated: 2024-09-16 19:35
VLAI
Title
Novel "ghost domain names" attack by introducing subdomain delegations
Summary
NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • n/a
Assigner
References
Impacted products
Vendor Product Version
NLnet Labs Unbound Affected: unspecified , ≤ 1.16.1 (custom)
Create a notification for this product.
Date Public
2022-08-01 00:00
Credits
We would like to thank Xiang Li from the Network and Information Security Lab of Tsinghua University for discovering and disclosing the vulnerability.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:49:34+00:00",
      "cve": "CVE-2022-30698",
      "id": "CVE-2022-30698",
      "initial_release_date": "2022-08-01T00:00:00+00:00",
      "product_status:fixed": "156",
      "product_status:known_affected": "10",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-30698.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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