DRUPAL-CONTRIB-2022-002 This module enables you to implement OAuth 2.0 authentication for Drupal.
Insufficient verification of client secrets in Drupal OAuth module allows bypassing confidentiality checks for certain grant types, potentially exposing data.
- 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 DRUPAL-CONTRIB-2022-002?
DRUPAL-CONTRIB-2022-002 is an authentication bypass vulnerability in drupal/simple_oauth, published on 5 Jan 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
This module enables you to implement OAuth 2.0 authentication for Drupal.
The module doesn't sufficiently verify client secret keys for "confidential" OAuth 2.0 clients when using certain grant types. The token refresh and client credentials grants are not affected.
This vulnerability is mitigated by the fact that the vast majority of OAuth 2.0 clients in the wild are public, not confidential. Furthermore, all affected grant types still require users to authenticate to Drupal during the OAuth flow.
The implicit grant type is insecure for other reasons (and still requires user authentication) and is disabled by default.
Sites at risk of information disclosure would be specifically configured to restrict access based on the OAuth client's confidentiality status and configured scopes, not only traditional Drupal user permissions and roles.
Further mitigation includes configuring allowed redirect URIs for clients. This is an OAuth best practice for guarding against man-in-the-middle attacks on authorization codes, and prevents redirection to imposter clients.
Anyone implementing OAuth 2.0 on their Drupal site is also encouraged to review the relevant RFCs and Internet-Drafts pertaining to OAuth security.
Which versions are affected by DRUPAL-CONTRIB-2022-002?
Linux distribution packages (1)
drupal/simple_oauth Packagist:https://packages.drupal.org/8 | All versions | 4.6.0, 5.0.6 |
How do I fix DRUPAL-CONTRIB-2022-002?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is DRUPAL-CONTRIB-2022-002 being exploited?
There is no known exploitation of DRUPAL-CONTRIB-2022-002 in the wild and no public exploit code.