CVE-2021-33444 : Exploit Details and Defense Strategies

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). The vulnerability involves a NULL pointer dereference in getprop_builtin_foreign() in mjs.c.

Understanding CVE-2021-33444

This section will provide insights into the details, impact, and mitigations related to CVE-2021-33444.

What is CVE-2021-33444?

CVE-2021-33444 pertains to a vulnerability in the mjs (mJS) JavaScript engine, particularly affecting ES6 (JavaScript version 6). The issue arises from a NULL pointer dereference in the function getprop_builtin_foreign() within the mjs.c file.

The Impact of CVE-2021-33444

The impact of this vulnerability can lead to potential exploitation by malicious actors, causing denial of service, data leaks, or remote code execution on affected systems.

Technical Details of CVE-2021-33444

This section will delve into the technical aspects of the vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability involves a NULL pointer dereference in the getprop_builtin_foreign() function within the mjs.c file, presenting a security risk for systems utilizing mJS with JavaScript version 6.

Affected Systems and Versions

All systems running mJS with ES6 (JavaScript version 6) are susceptible to this vulnerability. Specific product and version details are not available.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by crafting specially designed input to trigger the NULL pointer dereference, potentially leading to system compromise.

Mitigation and Prevention

This section will outline the immediate steps to take and long-term security practices to mitigate the risks associated with CVE-2021-33444.

Immediate Steps to Take

Patching: Apply security patches provided by the software vendor to address the vulnerability promptly.
Restrict Access: Limit network access to vulnerable systems and monitor for any suspicious activities.

Long-Term Security Practices

Regular Updates: Keep software and applications up-to-date to prevent exposure to known vulnerabilities.
Security Testing: Conduct regular security assessments to identify and remediate potential weaknesses in the system.

Patching and Updates

Regularly check for security advisories from the software vendor and apply patches as soon as they are available to ensure system integrity.