Autolab tar slip in Install Assessment functionality (`GHSL-2023-081`)

Vulnerability Description

Autolab is a course management service that enables auto-graded programming assignments. A Tar slip vulnerability was found in the Install assessment functionality of Autolab. To exploit this vulnerability an authenticated attacker with instructor permissions needs to upload a specially crafted Tar file. Using the install assessment functionality an attacker can feed a Tar file that contain files with paths pointing outside of the target directory (e.g., `../../../../tmp/tarslipped1.sh`). When the Install assessment form is submitted the files inside of the archives are expanded to the attacker-chosen locations. This issue has been addressed in version 2.11.0. Users are advised to upgrade.

References

• https://github.com/autolab/Autolab/security/advisories/GHSA-x9hj-r9q4-832c
• https://github.com/autolab/Autolab/commit/14f508484a8323eceb0cf3a128573b43eabbc80d
• https://securitylab.github.com/advisories/GHSL-2023-081_GHSL-2023-082_Autolab/