CyberRota Analysis
AI-GeneratedVersions of @fastify/http-proxy from 9.4.0 to 11.5.0 are vulnerable due to improper validation of WebSocket destination paths, allowing crafted upgrade requests to bypass the rewrite prefix and access unintended upstream endpoints. This vulnerability poses a significant risk, particularly for environments using non-normalizing WebSocket clients, as it could lead to unauthorized exposure of sensitive services. Organizations utilizing affected versions should prioritize upgrading to version 11.6.0 to mitigate this high-severity risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Impact: @fastify/http-proxy versions from 9.4.0 up to and including 11.5.0 fail to validate the resolved WebSocket destination path against the configured rewrite prefix. The WebSocket routing path in WebSocketProxy.findUpstream resolves the destination via the WHATWG URL constructor, which collapses dot segments, so a crafted upgrade request with path traversal sequences can escape the rewrite prefix and reach upstream endpoints that were not meant to be exposed by the proxy. This is a variant of CVE-2021-21322 in a code path that never went through the HTTP fix in fastify/reply-from. Exploitation requires a non-normalizing WebSocket client, since browsers and the ws package normalize the request path before sending, but raw HTTP clients or downstream proxies that forward the request target unchanged make the attack reachable in production topologies. Patches: upgrade to @fastify/http-proxy 11.6.0. Workarounds: none.
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