DRUPAL-CORE-2019-010 Drupal 8 core's `file_save_upload()` function does not strip the leading and trailing dot ('.') from filenames, like Drupal 7 did.
Authenticated users with upload permissions can bypass security protections by uploading files with leading or trailing dots, such as .htaccess files.
- 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 DRUPAL-CORE-2019-010?
DRUPAL-CORE-2019-010 is a vulnerability in drupal/core, published on 18 Dec 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Drupal 8 core's file_save_upload() function does not strip the leading and trailing dot ('.') from filenames, like Drupal 7 did.
Users with the ability to upload files with any extension in conjunction with contributed modules may be able to use this to upload system files such as .htaccess in order to bypass protections afforded by Drupal's default .htaccess file.
After this fix, file_save_upload() now trims leading and trailing dots from filenames.
Which versions are affected by DRUPAL-CORE-2019-010?
1 open source package ship an affected version, including drupal/core.
| Package | Affected | Fixed in |
|---|---|---|
drupal/core Packagist | From 8.0.0 | 8.7.11, 8.8.1 |
How do I fix DRUPAL-CORE-2019-010?
Upgrade drupal/core to a fixed version for your release line: 8.7.11 or 8.8.1.
Is DRUPAL-CORE-2019-010 being exploited?
There is no known exploitation of DRUPAL-CORE-2019-010 in the wild and no public exploit code.