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CVE-2021-3761— OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values

Quick assessment

Affected
Cloudflare octorpki
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.

RPKI是资源公钥基础设施（Resource Public Key Infrastructure，简称RPKI），也称资源认证（Resource Certification），中文全称“互联网码号资源公钥基础设施”，是一项旨在使互联网路由基础设施更安全的公开密钥基础建设（PKI）框架。 RPKI 中存在缓冲区错误漏洞，该漏洞源于产品未能充分检查VRP 的 MaxLength 值，攻击者可通过该漏洞导致缓冲区溢出。以下产品及版本受到影响：Cloudflare OctoRPKI 1.3.0 之前版本。

CVSS 7.5 · High EPSS 1.22% · P66
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I. Basic Information for CVE-2021-3761

Vulnerability Information
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Vulnerability Title
OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values
Source: CVE Program / CVE List V5
Vulnerability Description
Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.
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
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
RPKI 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RPKI是资源公钥基础设施（Resource Public Key Infrastructure，简称RPKI），也称资源认证（Resource Certification），中文全称“互联网码号资源公钥基础设施”，是一项旨在使互联网路由基础设施更安全的公开密钥基础建设（PKI）框架。 RPKI 中存在缓冲区错误漏洞，该漏洞源于产品未能充分检查VRP 的 MaxLength 值，攻击者可通过该漏洞导致缓冲区溢出。以下产品及版本受到影响：Cloudflare OctoRPKI 1.3.0 之前版本。
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
Cloudflare octorpki unspecified ~ 1.3.0 -

II. Public POCs for CVE-2021-3761

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III. Intelligence Information for CVE-2021-3761

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Vendor Advisories for CVE-2021-3761 (2)

IV. Related Vulnerabilities

Same product: octorpki
Same vendor: Cloudflare

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