CVE-2021-46509 : Exploit Details and Defense Strategies

Cesanta MJS v2.20.0 was found to have a stack overflow vulnerability via snquote at mjs/src/mjs_json.c.

Understanding CVE-2021-46509

This CVE involves a stack overflow vulnerability in Cesanta MJS v2.20.0.

What is CVE-2021-46509?

The vulnerability in Cesanta MJS v2.20.0 allows attackers to trigger a stack overflow through snquote in mjs_json.c.

The Impact of CVE-2021-46509

The vulnerability could potentially lead to arbitrary code execution, denial of service, or other malicious activities.

Technical Details of CVE-2021-46509

This section covers specific technical aspects of the vulnerability.

Vulnerability Description

Cesanta MJS v2.20.0 is susceptible to a stack overflow issue via snquote in mjs_json.c.

Affected Systems and Versions

Affected Version: v2.20.0
Systems: All systems running Cesanta MJS v2.20.0

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specific inputs to trigger the stack overflow.

Mitigation and Prevention

Implementing security measures is crucial to mitigate the risks associated with CVE-2021-46509.

Immediate Steps to Take

Update Cesanta MJS to a patched version, if available.
Apply appropriate security configurations to minimize the attack surface.

Long-Term Security Practices

Conduct regular security assessments and audits of the software.
Train developers and security teams on secure coding practices.
Monitor security mailing lists and vendor notifications for updates.

Patching and Updates

Ensure timely application of patches and updates to Cesanta MJS to address the stack overflow vulnerability.