CVE-2018-8609 in Dynamics 365
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Dynamics 365 (on-premises) version 8 when the server fails to properly sanitize web requests to an affected Dynamics server, aka "Microsoft Dynamics 365 (on-premises) version 8 Remote Code Execution Vulnerability." This affects Microsoft Dynamics 365.
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Analysis
by VulDB Data Team • 04/12/2020
The vulnerability CVE-2018-8609 represents a critical remote code execution flaw in Microsoft Dynamics 365 on-premises version 8 deployments. This vulnerability stems from insufficient input validation and sanitization mechanisms within the web request processing pipeline of the Dynamics server. Attackers can exploit this weakness by crafting malicious web requests that bypass the server's security controls, potentially allowing them to execute arbitrary code on the affected system with the privileges of the web application pool account. The flaw specifically manifests when the server processes user-supplied input without proper validation, creating an attack surface that can be leveraged for full system compromise.
The technical implementation of this vulnerability aligns with CWE-74, which describes "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')". The root cause lies in the inadequate sanitization of web requests, allowing malicious payloads to be interpreted as executable code rather than benign input. This injection vulnerability affects the server-side processing logic where user input flows directly into system commands or code execution contexts without proper validation or encoding. The attack vector typically involves sending specially crafted HTTP requests containing malicious input that the Dynamics server processes without sufficient sanitization, potentially leading to command execution on the target system.
The operational impact of CVE-2018-8609 extends beyond simple code execution, as it provides attackers with a foothold for further compromise within the organization's network infrastructure. Once successfully exploited, attackers can establish persistent access, escalate privileges, and potentially move laterally throughout the network. The vulnerability affects on-premises deployments specifically, making it particularly concerning for organizations that maintain their Dynamics 365 installations within their own data centers rather than using Microsoft's cloud services. This allows attackers to gain unauthorized access to sensitive business data, customer information, and financial records that are typically protected by the Dynamics 365 platform.
Organizations should implement immediate mitigations including applying the relevant Microsoft security patches, implementing network segmentation to limit access to Dynamics 365 servers, and deploying web application firewalls to monitor and filter suspicious requests. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, as it enables attackers to execute code remotely on target systems. Additional defensive measures include regular security assessments, monitoring for unusual network traffic patterns, and implementing principle of least privilege access controls for Dynamics 365 services. Organizations should also consider enabling enhanced logging and monitoring capabilities to detect potential exploitation attempts and establish incident response procedures for rapid remediation of affected systems.