CVE-2019-17493 : Security Advisory and Response

Jiangnan Online Judge (also known as jnoj) version 0.8.0 is vulnerable to a cross-site scripting (XSS) attack through specific parameters.

Understanding CVE-2019-17493

This CVE identifies a security vulnerability in Jiangnan Online Judge version 0.8.0 that allows for XSS attacks.

What is CVE-2019-17493?

The vulnerability in Jiangnan Online Judge version 0.8.0 enables attackers to execute malicious scripts via certain parameters in the web application.

The Impact of CVE-2019-17493

This XSS vulnerability can lead to unauthorized access, data theft, and potential manipulation of content on the affected web application.

Technical Details of CVE-2019-17493

Jiangnan Online Judge version 0.8.0 is susceptible to a specific type of attack due to inadequate input validation.

Vulnerability Description

The XSS vulnerability in Jiangnan Online Judge version 0.8.0 is triggered by the "Problem[sample_input]" parameter in the "web/admin/problem/create" or "web/polygon/problem/update" sections.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability can be exploited by injecting malicious scripts into the mentioned parameters, leading to the execution of unauthorized code on the web application.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Disable or sanitize user inputs to prevent script injection.
Implement proper input validation mechanisms.
Regularly monitor and audit the web application for any suspicious activities.

Long-Term Security Practices

Conduct regular security assessments and penetration testing.
Educate developers on secure coding practices to prevent XSS vulnerabilities.

Patching and Updates

Apply patches or updates provided by the software vendor to fix the XSS vulnerability in Jiangnan Online Judge version 0.8.0.