Prefix escape

Overview In fastify-reply-from before version 4.0.2, 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. Unfortunately, it is...

CVE-2021-21321 Prefix escape

fastify-reply-from is an npm package which is a fastify plugin to forward the current http request to another server. In fastify-reply-from before version 4.0.2, 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 i...

CVE-2021-21321

The CVE affects the npm package fastify-reply-from (a Fastify plugin used to forward requests to a backend). In versions prior to 4.0.2, a crafted URL could escape the proxied backend’s prefix (for example base URL /pub/), allowing access to resources that should be out of scope. Impact is data c...