Private files that had been uploaded by an anonymous user but not permanently attached to content on the site should only be visible to the anonymous user that uploaded them, rather than all anonymous users. Drupal core did not previously provide this protection, allowing an access bypass vulnerability to occur. This issue is mitigated by the fact that in order to be affected, the site must allow anonymous users to upload files into a private file system.
The security team has also received reports that this vulnerability is being exploited for spam purposes, similar to the scenario discussed in PSA-2016-003 for the public file system.
Part of security release SA-CORE-2017-003
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 8.0.0
- Drupal 8.0.1
- Drupal 8.0.2
- Drupal 8.0.3
- Drupal 8.0.4
- Drupal 8.0.5
- Drupal 8.0.6
- Drupal 8.1.0
- Drupal 8.1.1
- Drupal 8.1.2
- Drupal 8.1.3
- Drupal 8.1.4
- Drupal 8.1.5
- Drupal 8.1.6
- Drupal 8.1.7
- Drupal 8.1.8
- Drupal 8.1.9
- Drupal 8.1.10
- Drupal 8.2.0
- Drupal 8.2.1
- Drupal 8.2.2
- Drupal 8.2.3
- Drupal 8.2.4
- Drupal 8.2.5
- Drupal 8.2.6
- Drupal 8.2.7
- Drupal 8.2.8
- Drupal 8.3.0
- Drupal 8.3.1
- Drupal 8.3.2
- Drupal 8.3.3