CVE-2021-21297 : Vulnerability Insights and Analysis

Node-Red, a low-code programming platform for event-driven applications built using Node.js, was found to have a significant security vulnerability known as Prototype Pollution in versions prior to 1.2.8. This vulnerability in the admin API could allow a malformed request to modify the prototype of the default JavaScript Object, potentially impacting the default behavior of the Node-Red runtime. The issue has been addressed in the 1.2.8 release. Here's what you need to know about CVE-2021-21297.

Understanding CVE-2021-21297

This section provides insights into the nature of the CVE-2021-21297 vulnerability.

What is CVE-2021-21297?

Node-Red's versions before 1.2.8 are affected by a Prototype Pollution vulnerability in the admin API. This allows unauthorized users to modify the prototype of the default JavaScript Object and affect the runtime behavior.

The Impact of CVE-2021-21297

The CVSS base score for this vulnerability is 7.7, indicating a high severity level. The integrity of the system is at a high risk, while the confidentiality is not impacted. An attacker with low privileges can exploit this vulnerability via a network.

Technical Details of CVE-2021-21297

This section delves into the specific technical aspects of CVE-2021-21297.

Vulnerability Description

The vulnerability arises from improper handling of user input, allowing attackers to manipulate the prototype chain of objects.

Affected Systems and Versions

Node-Red versions earlier than 1.2.8 are vulnerable to this exploit. Users operating on these versions are advised to update to the latest release.

Exploitation Mechanism

By crafting a malicious request, attackers can pollute the prototype of the default JavaScript Object and potentially execute arbitrary code.

Mitigation and Prevention

Here are some crucial steps to mitigate the risks associated with CVE-2021-21297.

Immediate Steps to Take

Update Node-Red to version 1.2.8 or newer to eliminate the vulnerability.
Restrict access to the editor URL to authorized users only.

Long-Term Security Practices

Regularly monitor for security advisories and updates from the Node-Red team.
Implement secure coding practices to mitigate similar vulnerabilities in the future.

Patching and Updates

Keep Node-Red updated with the latest security patches and releases to safeguard your system against known vulnerabilities.