CVE-2020-8820 : What You Need to Know

Webmin 1.941 and earlier versions contain an XSS Vulnerability that impacts the Cluster Shell Commands Endpoint, allowing malicious users to execute arbitrary code.

Understanding CVE-2020-8820

This CVE involves a Cross-Site Scripting (XSS) Vulnerability in Webmin versions 1.941 and below, affecting the Cluster Shell Commands Endpoint.

What is CVE-2020-8820?

An XSS Vulnerability in Webmin versions 1.941 and earlier allows users to input malicious code in the Command field, leading to code execution upon revisiting the Cluster Shell Commands Menu.

The Impact of CVE-2020-8820

Malicious users can exploit this vulnerability to execute arbitrary code within the context of the affected application, potentially leading to unauthorized actions.

Technical Details of CVE-2020-8820

Webmin 1.941 and earlier versions are susceptible to an XSS Vulnerability that can be exploited through the Cluster Shell Commands Endpoint.

Vulnerability Description

The vulnerability allows attackers to inject and execute XSS payloads via the Command field in Webmin, enabling unauthorized code execution.

Affected Systems and Versions

Webmin versions 1.941 and earlier are affected by this XSS Vulnerability.

Exploitation Mechanism

By inputting malicious XSS payloads in the Command field and revisiting the Cluster Shell Commands Menu, attackers can trigger the execution of unauthorized code.

Mitigation and Prevention

To address CVE-2020-8820, users and administrators should take immediate and long-term security measures.

Immediate Steps to Take

Update Webmin to the latest patched version to mitigate the XSS Vulnerability.
Monitor and restrict user input to prevent the injection of malicious code.

Long-Term Security Practices

Regularly audit and review code for vulnerabilities like XSS.
Educate users on secure coding practices to prevent XSS attacks.

Patching and Updates

Apply security patches and updates provided by Webmin to address the XSS Vulnerability.