CVE-2021-33439 : Exploit Details and Defense Strategies

An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6) due to an Integer overflow in gc_compact_strings() in mjs.c.

Understanding CVE-2021-33439

This CVE involves an Integer overflow vulnerability in the mjs JavaScript engine in ES6.

What is CVE-2021-33439?

CVE-2021-33439 is a vulnerability in the mJS JavaScript engine that can be exploited due to an Integer overflow issue in gc_compact_strings() in mjs.c.

The Impact of CVE-2021-33439

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by crashing the application.

Technical Details of CVE-2021-33439

The following technical details outline the specifics of CVE-2021-33439.

Vulnerability Description

The Integer overflow occurs in the gc_compact_strings() function within the mjs.c file, leading to a potential security risk.

Affected Systems and Versions

The affected systems include those running the mJS JavaScript engine in ES6, with specific details available in the references.

Exploitation Mechanism

Exploiting this vulnerability involves manipulating the Integer overflow in gc_compact_strings() to trigger unauthorized actions.

Mitigation and Prevention

To address CVE-2021-33439, it is crucial to take immediate and long-term preventive measures.

Immediate Steps to Take

Immediate steps include applying security patches, monitoring for any suspicious activities, and restricting access to critical systems.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and educating staff on cybersecurity best practices can enhance long-term security.

Patching and Updates

Regularly updating the mJS JavaScript engine and monitoring official sources for patches and updates is essential in mitigating the risks associated with CVE-2021-33439.