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CVE-2024-42651: NanoMQ Heap Use-After-Free Vulnerability Leading to Denial of Service

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Overview

A critical vulnerability, CVE-2024-42651, has been discovered in NanoMQ v0.17.9, a high-performance messaging system. This vulnerability can be exploited by attackers to cause a Denial of Service (DoS) via a specifically crafted SUBSCRIBE message. It matters because it potentially puts systems at risk of compromise, disrupting operations and potentially leading to data leakage.

Vulnerability Summary

CVE ID: CVE-2024-42651
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

Affected Products

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Product | Affected Versions

NanoMQ | v0.17.9

How the Exploit Works

The vulnerability is a heap use-after-free flaw in the sub_Ctx_handle component of NanoMQ. An attacker can exploit this by sending a specially crafted SUBSCRIBE message to the NanoMQ server. The vulnerability is triggered when the server processes this malicious message, resulting in a use-after-free condition. This can cause the server to crash, leading to a Denial of Service, or potentially allowing arbitrary code execution.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This is not a real exploit code, rather it illustrates the type of malicious SUBSCRIBE message that could be used.

SUBSCRIBE /target_endpoint HTTP/1.1
Host: target.example.com
{ "malicious_payload": "use-after-free trigger" }

Mitigation Guidance

Users are advised to apply the vendor patch as soon as it is available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation, set to block or alert on anomalous SUBSCRIBE messages. Regular monitoring of the system logs is also recommended to detect any signs of exploitation.

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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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