CVE-2024-0537: Critical Remote Buffer Overflow Vulnerability in Tenda W9 1.0.0.7(4456)

Overview

A critical vulnerability, identified as CVE-2024-0537, has been discovered in the Tenda W9 1.0.0.7(4456) router. This vulnerability affects the function setWrlBasicInfo of the component httpd. The CVE-2024-0537 vulnerability is particularly concerning as it can be exploited remotely, which means that an attacker does not need to be on the same local network as the vulnerable device to exploit it. This makes it a prime target for hackers looking to compromise systems or steal sensitive data.

Vulnerability Summary

CVE ID: CVE-2024-0537
Severity: Critical (8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda W9 1.0.0.7(4456) | All versions

How the Exploit Works

The CVE-2024-0537 vulnerability is a stack-based buffer overflow vulnerability, which occurs when the argument ssidIndex is manipulated in the setWrlBasicInfo function of the httpd component. An attacker who exploits this vulnerability can cause the application to crash, potentially allowing them to execute arbitrary code or gain unauthorized access to the system.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited. In this example, an HTTP POST request is sent to the router with a malicious payload designed to overflow the buffer and potentially allow for the execution of arbitrary code.

POST /setWrlBasicInfo HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "ssidIndex": "A"*5000 }

In the above request, the ssidIndex is filled with a large number of “A” characters, which could potentially overflow the buffer and lead to the execution of arbitrary code.
Please note that this is a conceptual example, and the actual exploitation may vary based on the specifics of the target system and the attacker’s objectives.

Mitigation Guidance

The best way to protect against this vulnerability is to apply the vendor-supplied patch. However, if a patch is not available or cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. It’s also recommended to monitor network traffic for any unusual activity or spikes, which could indicate an active exploit attempt.