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Prefix escape

High
mcollina published GHSA-qmw8-3v4g-gwj4 Feb 23, 2021

Package

npm fastify-reply-from (npm)

Affected versions

all

Patched versions

>= v4.0.2

Description

Impact

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.

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

Patches

A patch have been submitted by Corey Farrell [email protected], the reporter.
All releases after v4.0.2 include the fix.

Workarounds

There are no workaround available.

For more information

If you have any questions or comments about this advisory:

Severity

High

CVE ID

CVE-2021-21321

Weaknesses

No CWEs