CVE-2023-32676 Explained : Impact and Mitigation

This article explores CVE-2023-32676, a vulnerability in Autolab's Install Assessment functionality that allows for a Tar slip attack. Read on to understand the impact, technical details, and mitigation steps associated with this CVE.

Understanding CVE-2023-32676

Autolab, a course management service for auto-graded programming assignments, contained a vulnerability in the Install assessment feature that could be exploited by an authenticated attacker with instructor privileges.

What is CVE-2023-32676?

The CVE-2023-32676 vulnerability, also known as a Tar slip vulnerability, allowed an attacker to upload a specially crafted Tar file containing files with paths pointing outside of the target directory. By submitting the file through the Install assessment form, the attacker could expand the files to chosen locations, posing a security risk.

The Impact of CVE-2023-32676

The impact of CVE-2023-32676 is rated as medium severity, with a CVSS base score of 6.7. This vulnerability could result in high availability and integrity impacts, albeit with low confidentiality impact. Attack complexity is low, and privileged access is required to exploit the issue.

Technical Details of CVE-2023-32676

The vulnerability stemmed from improper limitation of a pathname to a restricted directory, enabling path traversal by manipulating file paths to escape the intended directory structure.

Vulnerability Description

The vulnerability in Autolab's Install assessment functionality allowed an attacker to conduct a Tar slip attack by uploading a manipulated Tar file containing malicious paths.

Affected Systems and Versions

Autolab versions prior to 2.11.0 are affected by CVE-2023-32676, making users of these versions vulnerable to the exploit.

Exploitation Mechanism

An authenticated attacker with instructor permissions could upload a Tar file with crafted paths outside of the target directory, leveraging the Install assessment feature to expand files to unauthorized locations.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-32676, users are advised to take immediate steps and adopt long-term security practices.

Immediate Steps to Take

Affected users should upgrade to Autolab version 2.11.0 or later to address the Tar slip vulnerability and prevent potential exploitation.

Long-Term Security Practices

In the long term, organizations should implement secure coding practices, conduct regular security assessments, and prioritize timely software updates to avoid similar vulnerabilities.

Patching and Updates

Regularly monitoring for security advisories, applying patches promptly, and staying informed about security best practices are crucial for maintaining a secure environment.