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CVE-2022-2081: HCI Modbus TCP Function Vulnerability Leading to RTU500 CMU Reboot

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Overview

The CVE-2022-2081 vulnerability affects the HCI Modbus TCP function in certain product versions. This vulnerability could potentially lead to a system compromise or data leakage if exploited. Understanding and mitigating this vulnerability is crucial for organizations that rely on these systems for their operations.

Vulnerability Summary

CVE ID: CVE-2022-2081
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage, potential reboot of the targeted RTU500 CMU.

Affected Products

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Product | Affected Versions

HCI Modbus TCP function | All versions with enabled and configured HCI Modbus TCP

How the Exploit Works

The vulnerability exists in the HCI Modbus TCP function. If this function is enabled and configured, an attacker can exploit it by sending a specially crafted, high-rate message to the RTU500, which causes the targeted RTU500 CMU to reboot. The vulnerability arises from a lack of flood control, leading to an internal stack overflow in the HCI Modbus TCP function.

Conceptual Example Code

This is a conceptual representation of how the vulnerability might be exploited. In this instance, the attacker would send a high volume of messages to the target, causing a stack overflow and subsequent reboot.

FOR i = 1 TO 10000
SEND_MESSAGE_TO_TARGET("192.168.1.1", "Special crafted message")
NEXT i

Impact Summary

A successful exploitation of this vulnerability can lead to a potential system compromise or data leakage. The targeted RTU500 CMU would reboot, interrupting its normal operations and potentially leading to operational downtime.

Mitigation Guidance

Users can mitigate this vulnerability by applying the vendor’s patch or using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. Regularly updating and patching systems can also help to prevent this vulnerability from being exploited.

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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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