Microsoft Dataverse, a cloud-based data storage and management system, is under threat from a possible critical vulnerability known as CVE-2025-29807. This flaw allows an authorized attacker to execute code over a network by exploiting the deserialization of untrusted data.

In this comprehensive article, we will highlight the exploit details and provide coding snippets, as well as links to original references, to help you better understand and safeguard against this vulnerability.

What is CVE-2025-29807?

CVE-2025-29807 is a deserialization attack that targets Microsoft Dataverse. In a deserialization attack, the attacker exploits the deserialization process to execute malicious code by supplying untrusted data. Typically, an attacker would gain access to a system, manipulate the data, and exploit the vulnerability in the application's data handling procedure.

The deserialization attack is particularly dangerous, not only because it permits unauthorized attackers to execute code, but also because it enables them to carry out additional attacks such as privilege escalation, data tampering, or Distributed Denial of Service (DDoS) attacks.

Exploit Details

CVE-2025-29807 allows an attacker to exploit Microsoft Dataverse by sending specifically crafted malicious data over a network. The attacker would need to be an authorized user. This flaw could lead to a wide variety of data breaches, system compromises, and other serious consequences.

The code snippet below illustrates a possible way for an attacker to exploit CVE-2025-29807

import requests

# Replace with the target URL and parameters
target_url = "https://target-dataverse.example.com";
params = {"param1": "value1", "param2": "value2"}

# Replace with the attacker's malicious serialized object
malicious_serialized_object = "[...serialized object content...]"

# Send the request with the malicious serialized object as a parameter
response = requests.post(target_url, params=params, data=malicious_serialized_object)

if response.status_code == 200:
    print("Exploit succeeded")
else:
    print("Exploit failed")

The code above shows a simple Python script that sends a POST request containing a malicious serialized object. This object, when deserialized, will cause the unauthorized code execution on the target Microsoft Dataverse instance.

Mitigation

To protect against CVE-2025-29807, Microsoft advises updating your Dataverse instance to the latest version. Moreover, implementing secure deserialization techniques, input validation, and proper access control measures will help guard against deserialization attacks in general.

For the latest information and security updates, always refer to Microsoft's Security Update Guide (link provided below):

- Microsoft Security Update Guide

To learn more about secure deserialization techniques, refer to the following resources

1. OWASP Deserialization Cheat Sheet
2. Mitigating Deserialization Flaws - NIST

Conclusion

CVE-2025-29807 poses a significant threat to Microsoft Dataverse users by allowing the execution of unauthorized code over a network. By understanding the nature of this vulnerability and keeping up-to-date with security measures, you can mitigate this risk and safeguard your valuable data.

Stay informed and be prepared when it comes to your cybersecurity. Keep your software up-to-date and follow the best practices for implementing secure deserialization and data handling in your applications. Safety and security start with a proactive approach.

Timeline

Published on: 03/21/2025 01:15:17 UTC
Last modified on: 04/29/2025 22:06:31 UTC