CVE-2021-21321 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Reference

https://www.npmjs.com/package/fastify-reply-from https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889 https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4 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.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

10.0