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CVE-2022-30699— Novel "ghost domain names" attack by updating almost expired delegation information

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 5.9 Difficulty: Easy EPSS 1.16% · P67

Possible ATT&CK Techniques 1 AI

T1568.002 · Domain Generation Algorithms
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I. Basic Information for CVE-2022-30699

Vulnerability Information
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Vulnerability Title
Novel "ghost domain names" attack by updating almost expired delegation information
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 rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.
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-2022-30699

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III. Intelligence Information for CVE-2022-30699

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Vendor Advisories for CVE-2022-30699 (1)

Mailing List Discussions for CVE-2022-30699 (2)

Other References for CVE-2022-30699 (1)

IV. Related Vulnerabilities

Same product: Unbound
Same vendor: NLnet Labs

V. Comments for CVE-2022-30699

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