PT-2021-14418 · Unknown · @Fastify/Reply-From

Corey Farrell · Published 2021-03-02 · Updated 2021-03-09 · CVE-2021-21321

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions fastify-reply-from versions prior to 4.0.2

Description The issue allows an attacker to escape the prefix of the proxied backend service by crafting a specific URL. For example, if the base URL of the proxied server is "/pub/", an attacker can access "/priv" on the target service, which should not be possible.

Recommendations For versions prior to 4.0.2, update to version 4.0.2 or later to resolve the issue. As a temporary workaround, consider restricting access to sensitive areas of the proxied backend service until the update can be applied.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2021-21321

GHSA-QMW8-3V4G-GWJ4

Affected Products

@Fastify/Reply-From

References · 7

• https://github.com/fastify/fastify-reply-from/commit/dea227dda606900cc01870d08541b4dcc69d3889 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-21321 · Security Note
• https://osv.dev/vulnerability/GHSA-qmw8-3v4g-gwj4 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21321 · Vendor Advisory
• https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-qmw8-3v4g-gwj4 · Note
• https://t.me/cvenotify/10688 · Telegram Post
• https://npmjs.com/package/fastify-reply-from · Note