CVE-2021-23384 Open Redirect
An attacker can redirect users to malicious sites via crafted URLs with double slashes in the koa-remove-trailing-slashes middleware.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-23384?
CVE-2021-23384 is a medium-severity vulnerability in koa-remove-trailing-slashes, published on 17 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.
Weakness: CWE-601
Which versions are affected by CVE-2021-23384?
2 open source packages ship an affected version, including koa-remove-trailing-slashes. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
koa-remove-trailing-slashes npm | All versions | 2.0.2 |
koa-remove-trailing-slashes npm | All versions | 2.0.2 |
Products include Koa-Remove-Trailing-Slashes Project Koa-Remove-Trailing-Slashes.
How do I fix CVE-2021-23384?
Upgrade koa-remove-trailing-slashes to 2.0.2 or later.
Is CVE-2021-23384 being exploited?
There is no known exploitation of CVE-2021-23384 in the wild and no public exploit code.
Sources
Also known as GHSA-r773-pmw3-f4mr.