GHSA-7mx2-7q8p-pgmw Symfony may allow a user to switch to using another user's identity
Authenticated users can switch identities to other users by modifying their username in a form, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is GHSA-7mx2-7q8p-pgmw?
GHSA-7mx2-7q8p-pgmw is an authentication bypass vulnerability in symfony/symfony, published on 30 May 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Symfony 2.0.6 has just been released. It addresses a security vulnerability in the EntityUserProvider as provided in the Doctrine bridge.
If you let your users update their login/username from a form, and if you are using Doctrine as a user provider, then you are vulnerable and you should upgrade as soon as possible.
The issue is that it is possible for a user to switch to another one. Here is how to reproduce it: The current user changes its username via a form to another existing username. When the form is submitted, he will have a validation error (as the username already exists) but the user object in the session will still be modified to the new username. This user from the session will be used for the next requests and so the user will be switched to this other user.
The fix is to always refresh the user via the primary key (which cannot be updated via a form) instead of the username.
If you cannot upgrade immediately, please apply the following patch: https://github.com/symfony/symfony/commit/9d2ab9ca9c1762
Which versions are affected by GHSA-7mx2-7q8p-pgmw?
2 open source packages ship an affected version, including symfony/symfony.
| Package | Affected | Fixed in |
|---|---|---|
symfony/symfony Packagist | From 2.0.0 | 2.0.6 |
symfony/symfony Packagist | From 2.0.0 | 2.0.6 |
How do I fix GHSA-7mx2-7q8p-pgmw?
Upgrade symfony/symfony to 2.0.6 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is GHSA-7mx2-7q8p-pgmw being exploited?
There is no known exploitation of GHSA-7mx2-7q8p-pgmw in the wild and no public exploit code.