PT-2021-14419 · Unknown · Fastify-Http-Proxy

Published 2021-03-02 · Updated 2021-03-08 · CVE-2021-21322

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions fastify-http-proxy versions prior to 4.3.1

Description The issue allows an attacker to escape the prefix of the proxied backend service by crafting a specific URL. For example, if the base URL of the proxied server is /pub/, an attacker can access /priv on the target service, which should not be possible.

Recommendations For versions prior to 4.3.1, update to version 4.3.1 or later to resolve the issue. As a temporary workaround, consider restricting access to sensitive areas of the proxied backend service until the update can be applied.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2021-21322

GHSA-C4QR-GMR9-V23W

Affected Products

Fastify-Http-Proxy

References · 7

• https://github.com/fastify/fastify-http-proxy/commit/02d9b43c770aa16bc44470edecfaeb7c17985016 · Patch
• https://osv.dev/vulnerability/CVE-2021-21322 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21322 · Security Note
• https://osv.dev/vulnerability/GHSA-c4qr-gmr9-v23w · Vendor Advisory
• https://github.com/fastify/fastify-http-proxy/security/advisories/GHSA-c4qr-gmr9-v23w · Note
• https://npmjs.com/package/fastify-http-proxy · Note
• https://t.me/cvenotify/10689 · Telegram Post