CVE-2018-12120 : What You Need to Know

Node.js prior to version 6.15.0 had a vulnerability where the debugger port 5858 listened on all interfaces by default, potentially allowing remote code execution. This issue was addressed in Node.js 6.15.0.

Understanding CVE-2018-12120

Before Node.js version 6.15.0, the debugger port 5858 could be accessed remotely, enabling the execution of arbitrary JavaScript code. Subsequent versions, starting from Node.js 6.15.0, changed the default interface for the debugger to localhost.

What is CVE-2018-12120?

Node.js versions prior to 6.15.0 had a vulnerability in the debugger port 5858, allowing remote access for executing arbitrary JavaScript code.
Node.js 6.15.0 and later versions changed the default interface for the debugger to localhost.
Node.js 8 and later versions replaced the debugger with the inspector, eliminating this vulnerability.

The Impact of CVE-2018-12120

Remote attackers could exploit the debugger port vulnerability to execute arbitrary JavaScript code on affected systems.
Node.js versions prior to 6.15.0 were susceptible to unauthorized remote access.

Technical Details of CVE-2018-12120

Node.js vulnerability details and affected systems.

Vulnerability Description

The debugger port 5858 in Node.js versions prior to 6.15.0 listened on all interfaces, allowing remote access for executing arbitrary JavaScript code.

Affected Systems and Versions

Product: Node.js
Vendor: The Node.js Project
Affected Versions: All versions prior to Node.js 6.15.0

Exploitation Mechanism

Remote attackers could exploit the default debugger port to execute arbitrary JavaScript code on vulnerable systems.

Mitigation and Prevention

Protecting systems from CVE-2018-12120.

Immediate Steps to Take

Update Node.js to version 6.15.0 or later to mitigate the vulnerability.
Avoid using the debugger in Node.js versions prior to 6.15.0 in untrusted environments.

Long-Term Security Practices

Configure the debugger to listen only on localhost or specific trusted interfaces.
Regularly monitor and update Node.js to the latest secure versions.
Consider using alternative security mechanisms to replace the debugger.

Patching and Updates

Apply patches and updates provided by Node.js to address security vulnerabilities.