CVE-2019-17538 : Security Advisory and Response

Jiangnan Online Judge (also known as jnoj) version 0.8.0 is susceptible to a Directory Traversal vulnerability that enables unauthorized file reading through specific web requests.

Understanding CVE-2019-17538

This CVE entry highlights a security issue in the Jiangnan Online Judge platform that could lead to sensitive file exposure.

What is CVE-2019-17538?

The vulnerability in Jiangnan Online Judge version 0.8.0 allows attackers to read files by manipulating the 'viewfile' parameter in web requests.

The Impact of CVE-2019-17538

Exploitation of this vulnerability could result in unauthorized access to sensitive files stored on the server, potentially leading to data leakage or further system compromise.

Technical Details of CVE-2019-17538

Jiangnan Online Judge version 0.8.0 is affected by a Directory Traversal vulnerability that can be exploited through specific web requests.

Vulnerability Description

The flaw in the platform allows attackers to read arbitrary files by including '../' in the 'name' parameter of the 'viewfile' URL.

Affected Systems and Versions

Affected Version: 0.8.0
Product: Jiangnan Online Judge (jnoj)
Vendor: Not specified

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted requests to the 'viewfile' endpoint with manipulated parameters to traverse directories and access unauthorized files.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2019-17538.

Immediate Steps to Take

Disable or restrict access to the vulnerable 'viewfile' functionality.
Implement input validation to prevent directory traversal attacks.
Monitor and analyze web server logs for any suspicious activity.

Long-Term Security Practices

Regularly update the Jiangnan Online Judge platform to the latest secure version.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Apply patches or security updates provided by the Jiangnan Online Judge platform to fix the Directory Traversal vulnerability.