Wanhu ezEip Arbitrary File Upload Scanner

Wanhu ezEip is an enterprise information platform widely utilized by companies for managing their enterprise content and processes. It is employed by various businesses to streamline document management and improve workflow efficiency. Wanhu ezEip provides extensive functionalities for internal communication and task management. Its robust architecture supports integration with multiple business systems, offering a scalable solution for organizations. The platform is trusted for its ability to handle substantial organizational data securely. With features like secure document storage and collaborative tools, Wanhu ezEip is an essential part of many organizational infrastructures.

The Arbitrary File Upload vulnerability in Wanhu ezEip allows unauthorized users to upload files to the server through improperly handled endpoints. This vulnerability can be exploited by uploading malicious files that could lead to server compromise. If exploited, attackers can execute arbitrary code on the server, potentially gaining control over the server environment. This vulnerability is significant as it poses a severe risk of data breach and unauthorized data alterations. Arbitrary File Upload vulnerabilities often stem from inadequate validation of file types and file paths during the upload process. Addressing this weakness is critical to safeguarding the application’s integrity and the confidentiality of its data.

The vulnerability involves the AjaxUpload.ashx endpoint used in the Wanhu ezEip platform. Attackers can exploit this endpoint by sending specially crafted POST requests with a selectable boundary to bypass the server's file validation mechanisms. The POST request's multi-part form data allows an attacker to disguise harmful scripts as legitimate files such as images. Upon uploading the file, it may be executed if the server processes it, allowing for remote code execution. This technical weakness arises from insufficient input validation and sanitizing mechanisms. As evidenced by the crafted payload in the HTTP request, the server fails to enforce strict content type and file extension checks.

If an attacker successfully exploits the Arbitrary File Upload vulnerability, it can lead to severe consequences. Exploited vulnerabilities can facilitate unintended access to sensitive files, which can then be manipulated or exfiltrated by attackers. Successful exploitation may also enable remote code execution, acting as a gateway for attackers to gain persistent access to the server. Once the server is compromised, other attacks such as data tampering, service disruption, and potential pivoting to other systems can occur. The impact of this vulnerability underlines the critical importance of implementing robust security controls for file upload functionalities.