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CVE-2021-21322— Prefix escape

Quick assessment

Affected
fastify fastify-http-proxy
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.

Docs fastify-http-proxy是 （Docs）开源的一个应用软件。用于将将收到的所有带有给定前缀（或不带前缀）的请求转发给上游。 fastify-http-proxy 存在安全漏洞，该漏洞源于通过创建特定的URL，可以转义代理后端服务的前缀。

CVSS 10.0 · Critical EPSS 1.63% · P75

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21322

Vulnerability Information
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Vulnerability Title
Prefix escape
Source: CVE Program / CVE List V5
Vulnerability Description
fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is `/pub/`, a user expect that accessing `/priv` on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
fastify-http-proxy 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docs fastify-http-proxy是 （Docs）开源的一个应用软件。用于将将收到的所有带有给定前缀（或不带前缀）的请求转发给上游。 fastify-http-proxy 存在安全漏洞，该漏洞源于通过创建特定的URL，可以转义代理后端服务的前缀。
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
fastify fastify-http-proxy < 4.3.1 -

II. Public POCs for CVE-2021-21322

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III. Intelligence Information for CVE-2021-21322

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Patches & Fixes for CVE-2021-21322 (1)

Vendor Advisories for CVE-2021-21322 (1)

IV. Related Vulnerabilities

Same vendor: fastify
Same weakness: CWE-20

V. Comments for CVE-2021-21322

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