CVE-2023-32317 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2023-32317, a vulnerability found in the Autolab course management service's MOSS cheat checker functionality.

Understanding CVE-2023-32317

Autolab is a course management service that automates the grading of programming assignments. The vulnerability discovered, known as the Tar slip vulnerability, affects the MOSS cheat checker functionality in Autolab.

What is CVE-2023-32317?

The CVE-2023-32317 vulnerability allows an authenticated attacker with instructor permissions to upload a specially crafted Tar file. This file can contain paths outside their target directories, leading to arbitrary file write within the scope of the running process. The issue has been resolved in version 2.11.0 of Autolab.

The Impact of CVE-2023-32317

Exploiting this vulnerability can result in unauthorized users gaining access to sensitive files by writing arbitrary content to the system. It poses a risk to the integrity and availability of the affected systems.

Technical Details of CVE-2023-32317

The following technical details provide a deeper understanding of the CVE-2023-32317 vulnerability in Autolab.

Vulnerability Description

The vulnerability arises when Autolab processes specially crafted Tar files with paths outside their intended directories. This can lead to unauthorized writing of files within the target system.

Affected Systems and Versions

Autolab versions prior to 2.11.0 are affected by this vulnerability. Users running versions below 2.11.0 are at risk of exploitation.

Exploitation Mechanism

An authenticated attacker with instructor permissions needs to upload a malicious Tar file containing crafted paths. Once the MOSS cheat checker is initiated, these files are expanded to unauthorized locations within the system, potentially causing arbitrary file write.

Mitigation and Prevention

To safeguard systems from the CVE-2023-32317 vulnerability, immediate action and long-term security practices are essential.

Immediate Steps to Take

Users of Autolab are strongly advised to upgrade to version 2.11.0 or newer to mitigate the risk of exploitation. Additionally, review and validate uploaded files to detect any malicious content.

Long-Term Security Practices

Implement strong access controls and permissions for file uploads, regularly monitor system activities for suspicious behavior, and educate users on safe uploading practices to enhance overall system security.

Patching and Updates

Stay informed about security advisories and updates from Autolab, ensuring that the latest patches and versions are promptly applied to eliminate known vulnerabilities.