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CVE-2021-3909— Infinite open connection causes OctoRPKI to hang forever

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.

Cloudflare OctoRPKI是美国cloudflare（Cloudflare）的Cloudflare平台的RPKI工具箱。 Cloudflare OctoRPKI 存在安全漏洞，攻击者可以发送慢速DOS攻击，这使得OctoRPKI一直处于等待状态。

CVSS 4.4 · Medium EPSS 1.51% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-3909

Vulnerability Information
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Vulnerability Title
Infinite open connection causes OctoRPKI to hang forever
Source: CVE Program / CVE List V5
Vulnerability Description
OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Cloudflare OctoRPKI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloudflare OctoRPKI是美国cloudflare（Cloudflare）的Cloudflare平台的RPKI工具箱。 Cloudflare OctoRPKI 存在安全漏洞，攻击者可以发送慢速DOS攻击，这使得OctoRPKI一直处于等待状态。
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 ~ 1.4.0 -

II. Public POCs for CVE-2021-3909

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III. Intelligence Information for CVE-2021-3909

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Vendor Advisories for CVE-2021-3909 (3)

Same Patch Batch · Cloudflare · 2021-11-11 · 6 CVEs total

CVE-2021-3907 7.4 HIGH Arbitrary filepath traversal via URI injection
CVE-2021-3908 5.9 MEDIUM Infinite certificate chain depth results in OctoRPKI running forever
CVE-2021-3910 4.4 MEDIUM NUL character in ROA causes OctoRPKI to crash
CVE-2021-3912 4.2 MEDIUM OctoRPKI crashes when processing GZIP bomb returned via malicious repository
CVE-2021-3911 4.2 MEDIUM Misconfigured IP address field in ROA leads to OctoRPKI crash

IV. Related Vulnerabilities

Same product: octorpki
Same vendor: Cloudflare
Same weakness: CWE-400

V. Comments for CVE-2021-3909

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