by Kastro
Paper/Archive/CVE-2021-21321

CVE-2021-21321

fastify fastify-reply-from — Prefix escape

EPSS 2%CVSS 10.0
critical.is priorityof 100
46
CVSS 10.0 (CNA, NVD agree)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 78.8.788 × 2015.8No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
fastify-reply-from< 4.0.2–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

refgithub.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4refnpmjs.com/package/fastify-reply-fromrefgithub.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889