CVE-2020-2206 Explained : Impact and Mitigation

Jenkins VncRecorder Plugin 1.25 and earlier versions are susceptible to a reflected cross-site scripting (XSS) vulnerability due to improper handling of parameter values.

Understanding CVE-2020-2206

This CVE involves a security issue in the Jenkins VncRecorder Plugin that could allow attackers to execute malicious scripts in the context of a user's browser.

What is CVE-2020-2206?

CVE-2020-2206 is a vulnerability in Jenkins VncRecorder Plugin versions 1.25 and earlier, where a parameter value in the checkVncServ form validation endpoint is not properly escaped, leading to a cross-site scripting vulnerability.

The Impact of CVE-2020-2206

The vulnerability could be exploited by an attacker to inject and execute arbitrary scripts in the victim's browser, potentially compromising sensitive data or performing unauthorized actions.

Technical Details of CVE-2020-2206

The technical aspects of the CVE provide insights into the vulnerability's description, affected systems, and the exploitation mechanism.

Vulnerability Description

The Jenkins VncRecorder Plugin versions 1.25 and earlier fail to sanitize a parameter value in the checkVncServ form validation endpoint, enabling attackers to inject malicious scripts that get executed in the context of a user's browser.

Affected Systems and Versions

Product: Jenkins VncRecorder Plugin
Vendor: Jenkins project
Versions Affected: <= 1.25 (unspecified version type)

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious payload and persuading a user to interact with a specially crafted URL or form, leading to the execution of unauthorized scripts in the victim's browser.

Mitigation and Prevention

Protecting systems from CVE-2020-2206 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Jenkins VncRecorder Plugin to a patched version that addresses the XSS vulnerability.
Educate users about the risks of interacting with untrusted links or content.

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS attacks.
Regularly monitor and audit plugins and extensions for security vulnerabilities.

Patching and Updates

Apply security patches and updates provided by Jenkins project to mitigate the XSS vulnerability in the VncRecorder Plugin.