CVE-2021-46523 : Security Advisory and Response

Cesanta MJS v2.20.0 was found to have a heap buffer overflow vulnerability via to_json_or_debug at mjs/src/mjs_json.c.

Understanding CVE-2021-46523

This CVE involves a vulnerability in Cesanta MJS v2.20.0 that can lead to a heap buffer overflow.

What is CVE-2021-46523?

The vulnerability in Cesanta MJS v2.20.0 allows an attacker to trigger a heap buffer overflow through the to_json_or_debug function.

The Impact of CVE-2021-46523

The heap buffer overflow vulnerability can potentially lead to arbitrary code execution or denial of service.

Technical Details of CVE-2021-46523

This section provides more technical insights into the specific details of the vulnerability.

Vulnerability Description

Cesanta MJS v2.20.0 is prone to a heap buffer overflow due to improper input validation in the to_json_or_debug function.

Affected Systems and Versions

Operating Systems: Not specified
Cesanta MJS version 2.20.0 is affected

Exploitation Mechanism

By exploiting this vulnerability, an attacker can craft malicious input to trigger the heap buffer overflow, potentially leading to the execution of arbitrary code.

Mitigation and Prevention

To address CVE-2021-46523, follow the mitigation strategies below.

Immediate Steps to Take

Update Cesanta MJS to a patched version if available.
Implement input validation and proper error handling mechanisms.

Long-Term Security Practices

Regularly monitor security advisories from Cesanta for any updates.
Conduct security audits to identify and address vulnerabilities proactively.

Patching and Updates

Apply security patches provided by Cesanta promptly to mitigate the vulnerability.