When using Drupal’s private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module was trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability.
This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.
Part of security release SA-CORE-2018-001
This vulnerability affects the following application versions:
- Drupal 7.0
- Drupal 7.1
- Drupal 7.2
- Drupal 7.3
- Drupal 7.4
- Drupal 7.5
- Drupal 7.6
- Drupal 7.7
- Drupal 7.8
- Drupal 7.9
- Drupal 7.10
- Drupal 7.11
- Drupal 7.12
- Drupal 7.13
- Drupal 7.14
- Drupal 7.15
- Drupal 7.16
- Drupal 7.17
- Drupal 7.18
- Drupal 7.19
- Drupal 7.20
- Drupal 7.21
- Drupal 7.22
- Drupal 7.23
- Drupal 7.24
- Drupal 7.25
- Drupal 7.26
- Drupal 7.27
- Drupal 7.28
- Drupal 7.29
- Drupal 7.30
- Drupal 7.31
- Drupal 7.32
- Drupal 7.33
- Drupal 7.34
- Drupal 7.35
- Drupal 7.36
- Drupal 7.37
- Drupal 7.38
- Drupal 7.39
- Drupal 7.40
- Drupal 7.41
- Drupal 7.42
- Drupal 7.43
- Drupal 7.44
- Drupal 7.50
- Drupal 7.51
- Drupal 7.52
- Drupal 7.53
- Drupal 7.54
- Drupal 7.55
- Drupal 7.56