Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, with -l/–links, rclone serializes symlinks as .rclonelink text objects and recreates them on a local destination without validating the target, allowing an attacker-controlled remote to plant an escaping symlink and cause a following object write to land outside the destination with attacker-chosen contents. This issue is fixed in version 1.74.4.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Rclone | Rclone | * | 1.74.4 (excluding) |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html
References
- https://github.com/rclone/rclone/commit/1154afebee986180b489084d38e2a0c578751498
- https://github.com/rclone/rclone/commit/874a804f5289517defdd7de68b2a374837080265
- https://github.com/rclone/rclone/releases/tag/v1.74.4
- https://github.com/rclone/rclone/security/advisories/GHSA-cf44-9pgv-m4xc
- https://github.com/rclone/rclone/security/advisories/GHSA-cf44-9pgv-m4xc