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CVE-2024-1931— Denial of service when trimming EDE text on positive replies

Quick assessment

Affected
NLnet Labs Unbound
Exploitation
Public or AI PoC available; prioritize validation
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是荷兰NLnet Labs团队的一款开源DNS服务器。 NLnet Labs Unbound 1.18.0 至 1.19.1版本存在安全漏洞，该漏洞源于特定代码路径存在无限循环，导致拒绝服务。

CVSS 7.5 · High EPSS 2.52% · P84

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-1931

Vulnerability Information
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Vulnerability Title
Denial of service when trimming EDE text on positive replies
Source: CVE Program / CVE List V5
Vulnerability Description
NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs Unbound是荷兰NLnet Labs团队的一款开源DNS服务器。 NLnet Labs Unbound 1.18.0 至 1.19.1版本存在安全漏洞，该漏洞源于特定代码路径存在无限循环，导致拒绝服务。
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 1.18.0 ~ 1.19.2 -

II. Public POCs for CVE-2024-1931

# POC Description Source Link Shenlong Link
1 CVE-2024-1931-reproduction https://github.com/passer12/CVE-2024-1931-reproduction POC Details
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III. Intelligence Information for CVE-2024-1931

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Vendor Advisories for CVE-2024-1931 (1)

Mailing List Discussions for CVE-2024-1931 (4)

Other References for CVE-2024-1931 (1)

IV. Related Vulnerabilities

Same product: Unbound
Same vendor: NLnet Labs
Same weakness: CWE-835

V. Comments for CVE-2024-1931

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