CVE-2024-21393 in Dynamics 365
Summary
by MITRE • 02/13/2024
Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability
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Analysis
by VulDB Data Team • 03/04/2024
This vulnerability exists within Microsoft Dynamics 365 on-premises deployments where improper input validation allows malicious users to inject arbitrary script code into web interfaces. The flaw manifests as a cross-site scripting vulnerability that enables attackers to execute malicious scripts in the context of authenticated users' browsers, potentially leading to session hijacking, data theft, or privilege escalation within the Dynamics 365 environment. The vulnerability stems from insufficient sanitization of user-supplied input parameters that are subsequently rendered in web pages without proper encoding or validation mechanisms.
The technical implementation of this vulnerability allows attackers to craft malicious payloads that exploit weaknesses in how the application processes and displays user input. When legitimate users interact with affected components, the injected scripts execute within their browser context, potentially accessing sensitive information or performing unauthorized actions on their behalf. This type of vulnerability is classified under CWE-79 as Cross-site Scripting and aligns with ATT&CK technique T1531 for Establishing Persistence through Web Shell creation and T1071 for Application Layer Protocol usage.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to escalate privileges within the Dynamics 365 environment. An attacker who successfully exploits this weakness could gain access to customer data, modify business records, or even compromise the entire on-premises deployment if proper security boundaries are not maintained. The vulnerability is particularly concerning in enterprise environments where Dynamics 365 may be integrated with other systems and where user permissions are tightly controlled.
Organizations should implement multiple layers of defense including input validation controls, output encoding mechanisms, and regular security assessments to address this vulnerability. Microsoft recommends applying the latest security patches and updates to the Dynamics 365 on-premises components as soon as they become available. Additional mitigations include implementing Content Security Policy headers, conducting regular security code reviews, and establishing proper input sanitization routines. Network segmentation and access controls should also be enforced to limit potential damage from successful exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security practices in enterprise applications and highlights the need for continuous monitoring and rapid patch deployment strategies.