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CVE-2020-16859 : Exploit Details and Defense Strategies

Learn about CVE-2020-16859, a cross site scripting vulnerability in Microsoft Dynamics 365 (on-premises) version 9.0. Understand the impact, affected systems, exploitation mechanism, and mitigation steps.

Microsoft Dynamics 365 (On-Premise) Cross Site Scripting Vulnerability was published on September 8, 2020. The vulnerability affects Microsoft Dynamics 365 (on-premises) version 9.0. An authenticated attacker could exploit this vulnerability to perform cross-site scripting attacks and run scripts in the security context of the current authenticated user.

Understanding CVE-2020-16859

A cross site scripting vulnerability in Microsoft Dynamics 365 (on-premises) allows attackers to execute malicious scripts on affected systems, potentially leading to unauthorized access and actions within Dynamics Server.

What is CVE-2020-16859?

        The vulnerability arises from improper sanitization of web requests to affected Dynamics servers.
        An authenticated attacker can exploit this flaw by sending a specially crafted request.

The Impact of CVE-2020-16859

        Successful exploitation enables attackers to perform cross-site scripting attacks and run scripts in the user's security context.
        Attackers can read unauthorized content, manipulate permissions, and inject malicious content into users' browsers.

Technical Details of CVE-2020-16859

The vulnerability details and affected systems are as follows:

Vulnerability Description

        The security flaw allows attackers to execute cross-site scripting attacks on Microsoft Dynamics 365 (on-premises).

Affected Systems and Versions

        Vendor: Microsoft
        Product: Microsoft Dynamics 365 (on-premises) version 9.0
        Platforms: Unknown
        Versions Affected: 9.0.0

Exploitation Mechanism

        Attackers exploit the vulnerability by sending specially crafted requests to affected Dynamics servers.

Mitigation and Prevention

Protect your systems from CVE-2020-16859 with the following measures:

Immediate Steps to Take

        Apply the security update provided by Microsoft to ensure proper sanitization of web requests.

Long-Term Security Practices

        Regularly update and patch Microsoft Dynamics 365 to mitigate security risks.

Patching and Updates

        Stay informed about security updates and apply patches promptly to safeguard your systems.

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