CVE-2021-29452 Any logged in user could edit any other logged in user.
Any authenticated user can modify other users' data due to incorrect privilege checks in the a12n-server authentication library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-29452?
CVE-2021-29452 is a high-severity missing authorization vulnerability in curveball a12n-server, published on 16 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
a12n-server is an npm package which aims to provide a simple authentication system. A new HAL-Form was added to allow editing users in version 0.18.0. This feature should only have been accessible to admins. Unfortunately, privileges were incorrectly checked allowing any logged in user to make this change. Patched in v0.18.2.
Which versions are affected by CVE-2021-29452?
2 open source packages ship an affected version, including @curveball/a12n-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@curveball/a12n-server npm | From 0.18.0 | 0.18.2 |
@curveball/a12n-server npm | From 0.18.0 | 0.18.2 |
Products include Curveballjs A12n-Server.
How do I fix CVE-2021-29452?
Upgrade @curveball/a12n-server to 0.18.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-29452 being exploited?
There is no known exploitation of CVE-2021-29452 in the wild and no public exploit code.
Sources
Also known as GHSA-8hw9-22v6-9jr9.