Overview
CVE-2024-21327 is a significant Cross-Site Scripting (XSS) vulnerability identified in Microsoft Dynamics 365 Customer Engagement. This vulnerability, with a CVSS Severity Score of 7.6, impacts users of the aforementioned software, potentially leading to system compromise or data leakage. It is of utmost importance due to the critical role Microsoft Dynamics 365 plays in organizations’ customer management processes and the sensitive data it often handles.
Vulnerability Summary
CVE ID: CVE-2024-21327
Severity: High (7.6 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Microsoft Dynamics 365 Customer Engagement | All versions prior to the latest update
How the Exploit Works
The exploit takes advantage of the improper sanitization of user-supplied input in Microsoft Dynamics 365 Customer Engagement. An attacker can inject malicious scripts into web pages viewed by other users by including them in inputs that are then reflected back to the user. This could allow the attacker to steal sensitive information, hijack user sessions, or even gain control over the affected system.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This represents a malicious HTTP request:
POST /dynamics365/customer_engagement HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=<script>malicious_code();</script>&password=user_passwordIn the above example, the malicious script inserted in the ‘username’ parameter may be executed in the context of the user’s session, potentially leading to unauthorized activities.
Mitigation Guidance
To mitigate this vulnerability, users are advised to immediately apply the vendor-provided patch. In case the patch cannot be applied immediately, organizations should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure to detect and block attempts to exploit this vulnerability. Regularly updating and patching all software is a recommended best practice to reduce the risk of such vulnerabilities.
