| Package | Affected versions | Patched versions |
|---|---|---|
| activestorage | ≥ 8.0.0.beta1, < 8.0.4.1≥ 8.1.0.beta1, < 8.1.2.1< 7.2.3.1 | 8.0.4.18.1.2.17.2.3.1 |
| rails | ≥ 8.0.0, < 8.0.4.1≥ 8.1.0, < 8.1.2.1< 7.2.3.1 | 8.0.4.18.1.2.17.2.3.1 |
Active Storage's DiskService#path_for does not validate that the resolved filesystem path remains within the storage root directory. If a blob key containing path traversal sequences (e.g. ../) is used, it could allow reading, writing, or deleting arbitrary files on the server. Blob keys are expected to be trusted strings, but some applications could be passing user input as keys and would be affected.
The fixed releases are available at the normal locations.
This issue was responsibly reported by Hackerone researcher ksw9722.
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