A denial of service (DoS) vulnerability has been discovered in the web_server hashFirst functionality of Robustel R151 firmware versions 3.1.16 and 3.3.. This vulnerability can be exploited by attackers by sending a sequence of carefully crafted network requests, which can lead to the denial of service on the targeted device. The affected API endpoint is /action/import_aaa_cert_file/. In this article, we'll provide an in-depth explanation of the vulnerability, along with code snippets and references to the original research findings.

Details

The vulnerability, identified as CVE-2022-35264, exists in Robustel R151, which is an industrial-grade cellular IoT gateway commonly used for secure data transmission in various industries. The affected firmware versions are 3.1.16 and 3.3.. The issue lies in the hashFirst functionality of the web server, which could potentially allow an attacker to remotely trigger denial of service by sending sequences of malicious network requests.

/action/import_aaa_cert_file/

By exploiting this vulnerability, an attacker may impact the normal operation of the affected device and cause it to become unresponsive, disrupting the data transmission process and potentially leading to data loss or downtime.

Code Snippet

The exploitation of this vulnerability revolves around sending unusual and malicious network requests to the targeted API endpoint that would cause the device to crash. Here's a simplified example of how the payload could be constructed:

import requests

target_url = "http://<target-ip>/action/import_aaa_cert_file/";
file_upload = {
    "file": (
        "malicious_payload.txt", 
        "A" * 4096,  # Specially crafted payload to trigger the vulnerability
        "text/plain",
    ),
}
response = requests.post(target_url, files=file_upload)

print(response.status_code)

Replace <target-ip> with the IP address of the target device running the affected firmware version of Robustel R151.

Update their firmware to the latest version to address this vulnerability.

2. Implement proper network access controls and firewall rules to restrict unauthorized access to the management interfaces of their IoT devices.

References

This vulnerability was discovered and responsibly disclosed by security researchers who have provided detailed reports on their findings. For the original disclosure and further technical details, please refer to the following sources:

1. CVE-2022-35264 Details
2. NVD Vulnerability Details
3. Robustel R151 Vulnerability Report (Replace with the link to the original research findings)

Conclusion

The denial of service vulnerability in Robustel R151 firmware versions 3.1.16 and 3.3. has the potential to cause significant disruptions or loss of data for affected devices. Users must take action to update their device firmware and deploy appropriate network security measures to protect against this type of attack. As a reminder, it's essential to keep software and devices updated to ensure ongoing security.

Timeline

Published on: 10/25/2022 17:15:00 UTC
Last modified on: 04/26/2023 19:16:00 UTC