CVE-2022-30506

Vulnerability

MCMS 5.2.7 contains an arbitrary file upload vulnerability which can be exploited by uploading a crafted ZIP file [1][3]. The vulnerability exists in the file upload functionality, potentially allowing any file type to be uploaded without proper validation. By packaging a malicious executable file (e.g., a JSP or PHP shell) inside a ZIP archive, an attacker can achieve arbitrary code execution on the server.

Exploitation

An attacker can exploit this vulnerability by sending a specially crafted ZIP file to the file upload endpoint [1][3]. The exact authentication requirements are not specified in the available references, but arbitrary file upload typically requires at least low-level access (e.g., an authenticated user with upload permissions) or may be unauthenticated if the upload function is exposed. The attacker then accesses the uploaded file via a web path to trigger execution.

Impact

Successful exploitation allows an attacker to execute arbitrary code on the server with the privileges of the web application [1]. This can lead to full compromise of the confidentiality, integrity, and availability of the system, including data theft, modification, or denial of service.

Mitigation

As of the publication date, no official patch has been released for MCMS 5.2.7 [1]. Users should restrict file upload permissions to trusted users only, validate file contents (e.g., by examining ZIP entries), and consider applying file type whitelisting or disabling the upload feature until a fixed version is available.