e-office Arbitrary File Upload Scanner

OA E-Office is a web-based office automation system widely used by organizations to streamline their internal operations. It is employed globally by companies of all sizes, ranging from small enterprises to large corporations, to manage documents, workflows, and communication channels. The system is designed to improve efficiency by providing tools for document management, collaboration, and communication within an organization. As a result, it is a critical part of an organization’s digital infrastructure, often used to store sensitive and confidential information. The software supports multi-platform compatibility, making it accessible through web browsers and mobile devices, enhancing its utilization in various work environments. Its popularity stems from its flexibility and the comprehensive suite of features it offers, making it a staple in modern business environments.

An Arbitrary File Upload vulnerability in OA E-Office allows unauthorized users to upload malicious files to the server. Such vulnerabilities occur when the web application does not properly validate or sanitize the files being uploaded by users. This can result in malicious scripts being executed on the server, leading to unauthorized access or control of the system. The vulnerability can affect the integrity and confidentiality of the data stored within the application. Attackers may exploit this weakness to upload files containing malicious code designed to compromise the server or gain elevated privileges. Ensuring proper validation and sanitation of file uploads can mitigate the risks associated with this vulnerability.

Technical details of this vulnerability include the exploitation of the OfficeServer.php endpoint. The vulnerable parameter involves allowing file uploads without strict type checking on the content. Attackers leverage multipart/form-data requests to upload PHP scripts that can execute malicious operations on the server. The absence of proper validation mechanisms enables attackers to exploit this vulnerability by disguising scripts as legitimate files. As demonstrated in the scanner configuration, files are uploaded via POST requests, and their accessibility is confirmed using subsequent GET requests. The vulnerability is facilitated by insufficient input validation and a lack of controls to restrict unauthorized file uploads.

If exploited, this vulnerability can have severe consequences, including unauthorized server access, data breaches, and further exploitation of the network. Attackers can execute malicious code, potentially compromising sensitive organizational data or utilizing the compromised system for additional attacks. The server might also become part of a botnet, participating in large-scale attacks on other systems. Furthermore, exploitation might lead to data integrity issues, where confidential information is modified or deleted. This poses significant threats to the organization’s operational integrity, reputation, and compliance obligations.

REFERENCES

• https://github.com/PeiQi0/PeiQi-WIKI-Book/blob/main/docs/wiki/oa/%E6%B3%9B%E5%BE%AEOA/%E6%B3%9B%E5%BE%AEOA%20E-Office%20OfficeServer.php%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E.md