Yonyou NC Arbitrary File Upload Scanner

Yonyou NC is a comprehensive enterprise management software widely used in various industries for handling business operations, including supply chain, financial management, and human resources. Companies rely on this system to manage their daily operations, streamline processes, and integrate various business modules effectively. Yonyou NC is predominantly utilized by medium to large businesses seeking a unified platform to enhance their operational efficiency. Driven by a flexible architecture, it allows users to customize it according to their business needs, facilitating seamless integration with existing systems. The software finds its prominence in organizations that value extensive reporting capabilities and centralized data management. Its pervasive use across different sectors underlines its importance in enabling business transformations and driving digital initiatives.

The Arbitrary File Upload vulnerability allows unauthorized users to upload files to specific locations on a server, potentially enabling malicious activities. It poses a significant security risk by allowing attackers to execute arbitrary code on the server, leading to data breach or system compromise. Such vulnerabilities typically arise from insufficient validation checks during the file upload process or misconfigurations in server settings. Exploiting this vulnerability can lead to unauthorized access, data manipulation, or installation of malware. Organizations must prioritize securing file upload mechanisms by validating file types, enforcing file size restrictions, and using authenticated endpoints to mitigate the risk. End-users and system managers should be aware of such vulnerabilities to safeguard sensitive information and maintain system integrity.

In this vulnerability, the FileReceiveServlet endpoint in Yonyou NC is the point of exploitation, allowing an attacker to upload a file without proper authorization. The uploaded file, typically a script or executable, can then be executed to carry out malicious activities. In technical terms, once a malicious actor identifies this endpoint, they can send specially crafted HTTP requests that include the payload intended to be uploaded. Proper validation of both the file's metadata and content type is often lacking, making it easier for attackers to bypass security. The attacker manipulates the server-side handling process to ensure their scripts run as intended. Protecting such endpoints with relevant security measures is essential to defend against unauthorized access and maintain application integrity.

The potential effects of leveraging the Arbitrary File Upload vulnerability can be disastrous, allowing attackers to gain backdoor access to sensitive data or escalate privileges. When exploited, it can lead to unauthorized data manipulation, service disruptions, and a complete takeover of the vulnerable system. Data exfiltration, downed services, and compromised customer information are common outcomes. Moreover, it can exploit other connected systems, spreading the impact of the breach. Critical business operations may be at risk, leading to financial losses and reputational damage for the affected organization. Continuous monitoring and implementing robust security protocols are crucial to preemptively address such vulnerabilities.

REFERENCES

• https://github.com/zan8in/afrog/blob/main/v2/pocs/afrog-pocs/vulnerability/yonyou-nc-arbitrary-file-upload.yaml