CVE-2019-3911 Explained : Impact and Mitigation

CVE-2019-3911 was published on January 24, 2019, and affects LabKey Server Community Edition versions before 18.3.0-61806.763. The vulnerability allows an unauthenticated remote attacker to exploit a reflected cross-site scripting (XSS) issue.

Understanding CVE-2019-3911

This CVE involves a security vulnerability in LabKey Server Community Edition that enables attackers to inject arbitrary JavaScript code through a specific parameter.

What is CVE-2019-3911?

CVE-2019-3911 is a reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition versions prior to 18.3.0-61806.763. Attackers can manipulate the onerror parameter in the /__r2/query endpoints to execute malicious JavaScript code.

The Impact of CVE-2019-3911

The vulnerability allows unauthenticated remote attackers to inject arbitrary JavaScript code, potentially leading to unauthorized actions on the affected system.

Technical Details of CVE-2019-3911

This section provides more in-depth technical information about the CVE.

Vulnerability Description

An unauthenticated remote attacker can exploit a reflected cross-site scripting (XSS) vulnerability in LabKey Server Community Edition versions before 18.3.0-61806.763 by manipulating the onerror parameter within the /__r2/query endpoints.

Affected Systems and Versions

Product: LabKey Server Community Edition
Vendor: Tenable
Versions Affected: Versions before 18.3.0-61806.763

Exploitation Mechanism

Attackers can inject arbitrary JavaScript code by manipulating the onerror parameter in the /__r2/query endpoints of the affected LabKey Server Community Edition versions.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-3911.

Immediate Steps to Take

Update LabKey Server Community Edition to version 18.3.0-61806.763 or later to mitigate the vulnerability.
Monitor and restrict access to the /__r2/query endpoints to prevent unauthorized exploitation.

Long-Term Security Practices

Implement secure coding practices to prevent XSS vulnerabilities in web applications.
Regularly scan and test web applications for security vulnerabilities.

Patching and Updates

Regularly update LabKey Server Community Edition to the latest version to ensure protection against known vulnerabilities.