CVE-2021-34474 in Dynamics 365 Business Central
Summary
by MITRE • 07/15/2021
Dynamics Business Central Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 07/17/2021
The CVE-2021-34474 vulnerability represents a critical remote code execution flaw affecting Microsoft Dynamics Business Central implementations. This vulnerability resides within the web server component of the Dynamics Business Central platform, specifically within the handling of certain HTTP requests that process user-supplied input. The flaw stems from insufficient validation of input parameters within the application's request processing pipeline, creating an avenue for malicious actors to inject arbitrary code that executes within the context of the web server process. The vulnerability affects multiple versions of Dynamics Business Central including 2020 release wave 2 and earlier versions, making it particularly concerning given the widespread adoption of this business management solution across enterprise environments. Security researchers identified that the vulnerability manifests when the application processes specially crafted requests containing malicious payloads that bypass standard input sanitization mechanisms.
The technical exploitation of CVE-2021-34474 leverages a classic input validation vulnerability that aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation. Attackers can craft HTTP requests that contain malicious code within parameters or headers, which the application then processes without adequate sanitization. When the web server executes these malformed requests, the embedded code gets interpreted and executed with the privileges of the web application user, typically running with elevated permissions within the server environment. This vulnerability operates at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous as it allows attackers to gain unauthorized access to sensitive business data, execute arbitrary commands, and potentially establish persistent backdoors within the target environment. The vulnerability's impact extends beyond immediate code execution as it can serve as a stepping stone for further lateral movement within the network infrastructure.
The operational impact of CVE-2021-34474 is severe and multifaceted for organizations running affected Dynamics Business Central deployments. Successful exploitation can result in complete compromise of the affected systems, leading to data breaches, financial loss, and operational disruption. Organizations utilizing Dynamics Business Central for critical business operations face potential exposure of sensitive financial data, customer information, and proprietary business processes. The vulnerability's remote exploitability means that attackers can target these systems from anywhere on the internet, eliminating the need for physical access or insider knowledge. Security teams must also contend with the challenge of identifying compromised systems, as the attack may not immediately manifest in obvious ways. The vulnerability's presence in widely deployed business management software increases the risk of coordinated attacks against multiple organizations simultaneously, making it a prime target for threat actors seeking to maximize their impact.
Organizations should implement immediate mitigations including applying the relevant Microsoft security patches released in response to this vulnerability. The mitigation strategy should also incorporate network-level protections such as firewalls and intrusion detection systems to monitor for suspicious traffic patterns that may indicate exploitation attempts. Implementing web application firewalls can provide additional layers of protection by filtering malicious requests before they reach the application servers. Security configurations should be reviewed to ensure that the application runs with minimal required privileges and that unnecessary services are disabled. Regular security assessments and penetration testing should be conducted to verify the effectiveness of implemented controls. Organizations should also establish monitoring procedures to detect anomalous behavior patterns that may indicate successful exploitation attempts. The vulnerability's alignment with ATT&CK technique T1203 - Exploitation for Client Execution demonstrates the importance of comprehensive endpoint protection and network monitoring strategies to detect and prevent exploitation activities. Additionally, organizations should ensure that their incident response procedures include specific protocols for handling such remote code execution vulnerabilities to minimize potential damage and recovery time.