CVE-2021-33437 : Vulnerability Insights and Analysis

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There are memory leaks in frozen_cb() in mjs.c.

Understanding CVE-2021-33437

This CVE-2021-33437 vulnerability involves memory leaks in the frozen_cb() function within the mJS JavaScript engine.

What is CVE-2021-33437?

CVE-2021-33437 is a vulnerability found in the mJS JavaScript engine, specifically in the frozen_cb() function, leading to memory leaks.

The Impact of CVE-2021-33437

Exploitation of this vulnerability could result in denial of service (DoS) attacks, causing affected systems to crash due to excessive memory consumption.

Technical Details of CVE-2021-33437

The technical details of CVE-2021-33437 include:

Vulnerability Description

The vulnerability arises from memory leaks in the frozen_cb() function within the mJS JavaScript engine, impacting systems using ES6 (JavaScript version 6).

Affected Systems and Versions

All systems utilizing the mJS JavaScript engine with ES6 (JavaScript version 6) are vulnerable to this issue.

Exploitation Mechanism

Attackers could potentially exploit this vulnerability by crafting specially designed requests to trigger memory leaks, leading to system instability.

Mitigation and Prevention

To address CVE-2021-33437, consider the following mitigation strategies:

Immediate Steps to Take

Implement security patches provided by the mJS JavaScript engine maintainers.
Monitor system memory usage closely to detect any abnormal spikes indicating a potential exploit.

Long-Term Security Practices

Regularly update the mJS JavaScript engine to the latest version to ensure patches for known vulnerabilities are applied.
Conduct regular security audits to identify and remediate any emerging threats.

Patching and Updates

Stay informed about security updates and patches released by the mJS JavaScript engine developers to address CVE-2021-33437 and other security issues.