In this long-read post, we will dig deep into CVE-2024-21395, a Cross-site Scripting (XSS) vulnerability discovered in Microsoft Dynamics 365 (on-premises) version. XSS vulnerabilities occur when an attacker injects malicious scripts into web pages viewed by other users, potentially leading to compromised sensitive data and unauthorized access to different accounts.

We'll be covering the critical aspects of CVE-2024-21395, including code snippets, links to original references, and exploit details to understand this vulnerability better. So, let's dive in!

Understanding CVE-2024-21395

CVE-2024-21395 is a stored Cross-site Scripting vulnerability (CVE) that affects Microsoft Dynamics 365, a suite of enterprise resource planning (ERP) and customer relationship management (CRMs) applications. This vulnerability particularly affects the on-premises version of the software.

Exploiting this vulnerability allows a potential attacker to inject malicious scripts into the application, which can compromise sensitive data and take control of user accounts.

A link to the original CVE report and detailed information can be accessed here: CVE-2024-21395 - Official Details

How the Vulnerability Works

The vulnerability is exploited by injecting a malicious script into specific vulnerable fields within the application. The script is then executed in the context of other users who view the affected web pages.

To demonstrate this, let's consider a code snippet with a vulnerable HTML input field

<input type="text" id="user-comment" name="user-comment">

An attacker can inject a malicious script (JavaScript) into this field

<script>alert("XSS Vulnerability Detected");</script>

Once this malicious script is stored in the application, it is executed when other users access the affected web page, potentially leading to unwanted side-effects such as stolen session cookies or compromised accounts.

Wait for other users to access the affected web page and execute the malicious script.

For more detailed information on the exploitation process, refer to the following link: CVE-2024-21395 - Exploitation

Mitigation and Remediation

Microsoft has acknowledged the vulnerability and released a security update addressing this issue. To mitigate the risk and protect against CVE-2024-21395, users are advised to:

Enable Content Security Policy (CSP) as a defense mechanism against script injection attacks.

For more details on the security update and mitigation strategies, refer to the following link: CVE-2024-21395 - Patch and Mitigation

Conclusion

CVE-2024-21395 is a critical stored Cross-site Scripting vulnerability that needs immediate attention, as it can lead to stolen sensitive data and compromised accounts. By understanding the exploit details and applying the necessary security updates and mitigation strategies, organizations using Microsoft Dynamics 365 (on-premises) can protect themselves against attacks exploiting this vulnerability. Stay safe, and ensure you keep your software up to date!

Timeline

Published on: 02/13/2024 18:15:57 UTC
Last modified on: 02/23/2024 17:41:14 UTC