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CVE-2025-5156: Critical Buffer Overflow Vulnerability in H3C GR-5400AX

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Overview

A critical vulnerability has been discovered in the H3C GR-5400AX up to version 100R008. This vulnerability, identified as CVE-2025-5156, affects the EditWlanMacList function of the /routing/goform/aspForm file and can lead to a buffer overflow. This vulnerability is of particular concern because it can be exploited remotely, potentially leading to system compromise or data leakage. Despite early contact about the vulnerability, the vendor has yet to respond, underscoring the need for immediate action from users to mitigate potential damage.

Vulnerability Summary

CVE ID: CVE-2025-5156
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

H3C GR-5400AX | Up to 100R008

How the Exploit Works

The vulnerability stems from improper handling of the ‘param’ argument in the EditWlanMacList function. By manipulating this argument, an attacker can cause the system to overflow its buffer, leading to unpredictable system behavior. This could range from crashes to the execution of arbitrary code, the latter of which could give the attacker control over the system.

Conceptual Example Code

Given that the vulnerability lies in the manipulation of the ‘param’ argument, an example exploit might look like this:

POST /routing/goform/aspForm HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"param": "A"*10000
}

In this instance, the “A”*10000 represents a string of 10,000 ‘A’ characters. This oversupply of input data could cause the system’s buffer to overflow, leading to the aforementioned unpredictable behavior.

Mitigation Guidance

Until a patch is released by the vendor, users are advised to use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as temporary mitigation. These systems can help identify and block attempts to exploit this vulnerability.
Remember, the best defense against any vulnerability is to keep all systems, software, and applications up-to-date, enforce strong password policies, limit user permissions, and regularly back up all critical data.

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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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