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CVE-2021-43172— Infinite length chain of RRDP repositories

Quick assessment

Affected
NLnet Labs Routinator
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 Routinator是荷兰Stichting NLnet（Stichting Nlnet）实验室的一款使用Rust语言编写的RPKI（资源公钥基础设施）验证器。 NLnet Labs Routinator prior存在安全漏洞，该漏洞源于网络系统或产品中缺乏有效的信任管理机制。攻击者可利用默认密码或者硬编码密码、硬编码证书等攻击受影响组件。

AI Predicted 7.5 Difficulty: Moderate EPSS 1.26% · P69

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-43172

Vulnerability Information
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Vulnerability Title
Infinite length chain of RRDP repositories
Source: CVE Program / CVE List V5
Vulnerability Description
NLnet Labs Routinator prior to 0.10.2 happily processes a chain of RRDP repositories of infinite length causing it to never finish a validation run. In RPKI, a CA can choose the RRDP repository it wishes to publish its data in. By continuously generating a new child CA that only consists of another CA using a different RRDP repository, a malicious CA can create a chain of CAs of de-facto infinite length. Routinator prior to version 0.10.2 did not contain a limit on the length of such a chain and will therefore continue to process this chain forever. As a result, the validation run will never finish, leading to Routinator continuing to serve the old data set or, if in the initial validation run directly after starting, never serve any data at all.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Routinator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs Routinator是荷兰Stichting NLnet（Stichting Nlnet）实验室的一款使用Rust语言编写的RPKI（资源公钥基础设施）验证器。 NLnet Labs Routinator prior存在安全漏洞，该漏洞源于网络系统或产品中缺乏有效的信任管理机制。攻击者可利用默认密码或者硬编码密码、硬编码证书等攻击受影响组件。
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 Routinator unspecified ~ 0.10.1 -

II. Public POCs for CVE-2021-43172

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III. Intelligence Information for CVE-2021-43172

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Other References for CVE-2021-43172 (1)

Same Patch Batch · NLnet Labs · 2021-11-09 · 3 CVEs total

CVE-2021-43173 Hanging RRDP request
CVE-2021-43174 gzip transfer encoding caused out-of-memory crash

IV. Related Vulnerabilities

Same product: Routinator
Same vendor: NLnet Labs
Same weakness: CWE-674

V. Comments for CVE-2021-43172

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