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CVE-2023-49551: Denial of Service Vulnerability in Cesanta mjs 2.20.0

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Overview

CVE-2023-49551 presents a significant cybersecurity threat with a potential for system compromise or data leakage. This vulnerability specifically affects Cesanta mjs 2.20.0, a lightweight JavaScript engine for embedded systems. It provides an avenue for remote attackers to induce a denial of service (DoS) condition, thereby disrupting operations and potentially causing loss of service availability.

Vulnerability Summary

CVE ID: CVE-2023-49551
Severity: High – 7.5 CVSS Score
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Successful exploitation can lead to a system compromise or potential data leakage.

Affected Products

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Product | Affected Versions

Cesanta mjs | 2.20.0

How the Exploit Works

The vulnerability resides in the mjs_op_json_parse function in the mjs.c file of Cesanta mjs 2.20.0. A remote attacker can exploit this issue by sending a specially crafted request that the function fails to process correctly. This leads to a denial of service and potential system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a simplified example and real-world attacks might be more complex and sophisticated.

POST /mjs_op_json_parse HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_json": "{...malformed json data...}" }

In this example, the `{…malformed json data…}` represents a malicious payload designed to exploit the vulnerability in the mjs_op_json_parse function.

Mitigation

Users of Cesanta mjs 2.20.0 are advised to apply the vendor’s patch as soon as it becomes available. In the meantime, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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