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CVE-2025-44653: DoS Vulnerability in H3C GR2200 MiniGR1A0V100R016 Due to USERLIMIT_GLOBAL Option Misconfiguration

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Overview

This report provides a detailed analysis of a serious Denial of Service (DoS) vulnerability, identified as CVE-2025-44653, found in H3C GR2200 MiniGR1A0V100R016. This vulnerability can be exploited when the USERLIMIT_GLOBAL option is set to 0, enabling unlimited user connections and thus potentially leading to DoS attacks. This vulnerability poses a threat to any organization using the affected software, as it could lead to system compromise and data leakage.

Vulnerability Summary

CVE ID: CVE-2025-44653
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

H3C GR2200 | MiniGR1A0V100R016

How the Exploit Works

The vulnerability lies in the /etc/bftpd.conf file, specifically in the USERLIMIT_GLOBAL option. When this option is set to 0, there are no restrictions on the number of users that can connect to the system. An attacker can exploit this by initiating an overwhelming number of connections, eventually leading to a denial of service attack. The system will struggle to handle the load, and this may also result in system compromises and potential data leaks.

Conceptual Example Code

A conceptual illustration of the vulnerability exploitation could be a shell script that initiates an excessive number of connections to the affected system. This could look something like this:

#!/bin/bash
while true
do
netcat target.example.com 21 &
done

This script will continuously initiate connections to the FTP service of the target system, potentially causing a denial of service.

Mitigation Guidance

To mitigate this vulnerability, users should apply the vendor’s patch as soon as it becomes available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation, set to limit the number of connections from a single IP address.

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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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