CVE-2021-21321 – Prefix escape

https://notcve.org/view.php?id=CVE-2021-21321

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 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 4.0.2. fastify-reply-from es un paquete npm que es un plugin fastify para reenviar la petición http actual a otro servidor. • https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889 https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4 https://www.npmjs.com/package/fastify-reply-from https://access.redhat.com/security/cve/CVE-2021-21321 https://bugzilla.redhat.com/show_bug.cgi?id=1942178 • CWE-20: Improper Input Validation •