CVE-2021-46513 : Security Advisory and Response

Cesanta MJS v2.20.0 was discovered to contain a global buffer overflow vulnerability via mjs_mk_string at mjs/src/mjs_string.c.

Understanding CVE-2021-46513

What is CVE-2021-46513?

Cesanta MJS v2.20.0 has a vulnerability that allows attackers to trigger a buffer overflow through mjs_mk_string at mjs/src/mjs_string.c.

The Impact of CVE-2021-46513

This vulnerability could be exploited by attackers to execute arbitrary code, potentially leading to a denial of service or unauthorized access.

Technical Details of CVE-2021-46513

Vulnerability Description

The vulnerability in Cesanta MJS v2.20.0 enables a global buffer overflow via mjs_mk_string.

Affected Systems and Versions

Affected Systems: Not applicable
Affected Versions: Cesanta MJS v2.20.0

Exploitation Mechanism

The vulnerability can be exploited by crafting a specific input to trigger the buffer overflow.

Mitigation and Prevention

Immediate Steps to Take

Users should update Cesanta MJS to the latest version to mitigate the vulnerability.
Implement input validation mechanisms to prevent buffer overflows.

Long-Term Security Practices

Regularly apply security patches and updates to all software components.
Conduct security assessments and audits to identify and address vulnerabilities.

Patching and Updates

It is crucial to monitor security advisories and promptly apply patches released by Cesanta to secure the system.