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CVE-2022-30698

6.5 · MEDIUM

NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack.

Published Aug 1, 2022CWE-613EPSS 1.12%

Overview

CVE-2022-30698 is a medium-severity vulnerability. It was published on August 1, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.debian.org/debian-lts-announce/2023/03/msg00024.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L3ZFWZZFPBIL654BG75RWXUMPFQJ5EC/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D35CX4SCZVNKZTWJXPDFTHWZHINMGEZD/Refsecurity.gentoo.org/glsa/202212-02Refwww.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txtReflists.debian.org/debian-lts-announce/2023/03/msg00024.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L3ZFWZZFPBIL654BG75RWXUMPFQJ5EC/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D35CX4SCZVNKZTWJXPDFTHWZHINMGEZD/Refsecurity.gentoo.org/glsa/202212-02Refwww.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt

How CyberStrike helps

Frequently asked questions

What is CVE-2022-30698?

CVE-2022-30698 is a medium-severity vulnerability. It was published on August 1, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2022-30698?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-30698?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-30698?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-30698 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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