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CVE-2023-49553: Cesanta mjs 2.20.0 Denial of Service Vulnerability

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Overview

The vulnerability CVE-2023-49553 is a critical concern in the cybersecurity realm. It is a vulnerability in Cesanta mjs 2.20.0 which allows a remote attacker to cause a denial of service via the mjs_destroy function. This issue affects any system using Cesanta mjs 2.20.0 and can potentially lead to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2023-49553
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise, and data leakage.

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Product | Affected Versions

Cesanta mjs | 2.20.0

How the Exploit Works

The vulnerability originates from a flaw in the mjs_destroy function within the mjs.c file in Cesanta mjs 2.20.0. The issue allows a remote attacker to trigger a denial of service. The attacker sends a specially crafted request to the Cesanta mjs, which fails to handle it properly, thereby leading to a denial of service.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. Note that the exact payload will depend on the specific configuration and environment.

POST /mjs_destroy HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "specially_crafted_request_to_trigger_dos" }

Mitigation Guidance

The recommended mitigation strategy is to apply the vendor patch as soon as it becomes available. Meanwhile, as a temporary mitigation measure, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to block or alert on the malicious requests that attempt to exploit this vulnerability. Regularly updating and patching software is an effective practice to reduce the risk of such vulnerabilities.

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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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