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CVE-2022-30698— Novel "ghost domain names" attack by introducing subdomain delegations

Quick assessment

Affected
NLnet Labs Unbound
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NLnet Labs Unbound是NLnet Labs公司的一款开源DNS服务器。 NLnet Labs Unbound 1.16.1及之前版本存在代码问题漏洞，该漏洞源于允许恶意用户继续触发恶意域名的可解析性。

AI Predicted 4.7 Difficulty: Moderate EPSS 1.05% · P62
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I. Basic Information for CVE-2022-30698

Vulnerability Information
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Vulnerability Title
Novel "ghost domain names" attack by introducing subdomain delegations
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs Unbound是NLnet Labs公司的一款开源DNS服务器。 NLnet Labs Unbound 1.16.1及之前版本存在代码问题漏洞，该漏洞源于允许恶意用户继续触发恶意域名的可解析性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NLnet Labs Unbound unspecified ~ 1.16.1 -

II. Public POCs for CVE-2022-30698

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III. Intelligence Information for CVE-2022-30698

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Vendor Advisories for CVE-2022-30698 (1)

Mailing List Discussions for CVE-2022-30698 (2)

Other References for CVE-2022-30698 (1)

IV. Related Vulnerabilities

Same product: Unbound
Same vendor: NLnet Labs

V. Comments for CVE-2022-30698

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