CVE-2023-49551 Explained : Impact and Mitigation

A denial of service vulnerability in Cesanta mjs version 2.20.0 can be exploited by a remote attacker through the mjs_op_json_parse function in the msj.c file.

Understanding CVE-2023-49551

This section will provide an overview of the CVE-2023-49551 vulnerability.

What is CVE-2023-49551?

The CVE-2023-49551 vulnerability is a denial of service flaw present in Cesanta mjs 2.20.0, allowing a remote attacker to impact the availability of the system or service.

The Impact of CVE-2023-49551

The exploitation of CVE-2023-49551 can lead to denial of service, potentially disrupting the normal functioning of the affected system.

Technical Details of CVE-2023-49551

In this section, we will delve into the technical aspects of CVE-2023-49551.

Vulnerability Description

The vulnerability lies in the mjs_op_json_parse function within the msj.c file, which can be abused by a remote attacker to trigger a denial of service condition.

Affected Systems and Versions

All instances of Cesanta mjs version 2.20.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit the mjs_op_json_parse function to send crafted input, leading to resource exhaustion and causing a denial of service.

Mitigation and Prevention

This section will cover the steps to mitigate and prevent the exploitation of CVE-2023-49551.

Immediate Steps to Take

It is recommended to update Cesanta mjs to a patched version that addresses the denial of service vulnerability.
Network level controls and proper input validation can help reduce the risk of exploitation.

Long-Term Security Practices

Regular security audits and code reviews can help in identifying and addressing vulnerabilities promptly.

Patching and Updates

Stay informed about security updates for Cesanta mjs and apply patches as soon as they are released to ensure the security of the system.