GHSA-qmw8-3v4g-gwj4

Prefix escape

Source: GitHub Advisory Database (reviewed) Critical CVE-2021-21321

Packages

Ecosystem	Package	Affected	Fixed in
npm	fastify-reply-from	< 4.0.2	4.0.2

Details

As written in the advisory (Markdown source, shown as plain text).

### 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](https://www.first.org/cvss/calculator/3.1#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: * Open an issue in [fastify-reply-from](https://github.com/fastify/fastify-reply-from) * Email us at [[email protected]](mailto:[email protected])

References

External links from the advisory. They lead to third-party sites.