Wanhu OA OfficeServerServlet Arbitrary File Upload Scanner

Wanhu OA is a widely used enterprise office management software designed to facilitate businesses' workflow processes. It is predominantly used by organizations to handle document management and collaborative operations within offices. The software offers features like internal communication, document sharing, and task management, mainly utilized by mid to large-scale enterprises. Many companies deploy Wanhu OA to improve efficiency and streamline their internal operations. It integrates with existing office infrastructure to bring a seamless experience and enhance productivity. Wanhu OA is often deployed on-premises or in private cloud environments to comply with corporate data security protocols.

The Arbitrary File Upload vulnerability in Wanhu OA allows unauthorized users to upload files to the server, which can then be executed or used for malicious intents. This vulnerability arises from improper validation and lack of restrictions on file types and paths during the upload process. Attackers can exploit this weakness to upload scripts or malware, leading to a full compromise of the affected system. Arbitrary File Upload vulnerabilities are dangerous as they can result in unauthorized access, data breaches, and serve as a foothold for further attacks. Effective security measures must be implemented to prevent exploitation of this vulnerability. Unchecked, such vulnerabilities could expose sensitive information and critical infrastructure to significant risks.

Technical details of the vulnerability indicate that the endpoint '/defaultroot/officeserverservlet' is susceptible to arbitrary file uploads. An attacker can craft a request targeting this endpoint with specially selected payloads that bypass existing file type restrictions. The vulnerability lies in the lack of robust parameter validation, permitting unauthorized file uploads. Given the server’s response with a “DBSTEP V3.0” and “Post” along with HTTP 200 status code, it demonstrates successful exploitation if not secured. Proper validation mechanisms and input filters should be enforced to mitigate this risk. Absent these precautions, attackers might gain control over affected systems by uploading and executing malicious files.

Exploitation of this vulnerability could result in a range of adverse effects. A successful attack might allow the attacker to upload nefarious files that could be used for running unauthorized scripts or accessing confidential data. Such an intrusion might lead to system downtime, unauthorized data modification, or complete system control by the attacker. The implications also include data breaches which could compromise sensitive client or organizational information, damaging reputation and incurring legal penalties. In more severe cases, attackers can establish backdoors, turning vulnerable systems into a base for launching further attacks.

REFERENCES

• https://github.com/onMey/WH/blob/main/poc.py
• http://wiki.peiqi.tech/wiki/oa/万户OA/万户OA%20OfficeServer.jsp%20任意文件上传漏洞.html