CVE-2023-32676 Autolab tar slip in Install Assessment functionality (`GHSL-2023-081`)

Medium 6.7 Published 26 May 2023 Updated 15 Oct 2024

Authenticated instructors can execute arbitrary code or modify files by uploading a malicious tar archive with path traversal sequences.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-32676?

CVE-2023-32676 is a medium-severity path traversal vulnerability in Autolab, published on 26 May 2023. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-22

Which versions are affected by CVE-2023-32676?

It affects 1 product.

Products include Autolabproject Autolab.

How do I fix CVE-2023-32676?

No fix has been published for CVE-2023-32676 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2023-32676 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32676 exists.

Sources

Also known as GHSA-x9hj-r9q4-832c.