An issue was discovered on WAGO e!DISPLAY 762-3000 through 762-3003 devices with firmware before FW 02. Weak permissions allow an authenticated user to overwrite critical files by abusing the unrestricted file upload in the WBM.

An issue was discovered on WAGO e!DISPLAY 762-3000 through 762-3003 devices with firmware before FW 02. Weak permissions allow an authenticated user to overwrite critical files by abusing the unrestricted file upload in the WBM.

An unauthenticated user can exploit a vulnerability (CVE-2018-12981) to inject code in the WBM via reflected cross-site scripting (XSS), if he is able trick a user to open a special crafted web site. This could allow an attacker to execute code in the context of the user and execute arbitrary commands with restriction to the permissions of the user. Authenticated users can use a vulnerability to inject code in the WBM via persistent cross-site scripting (XSS) via special crafted requests which will be rendered and/or executed in the browser. Authenticated WBM users can transfer arbitrary files to different file system locations (CVE- 2018-12980) to which the web server has the required permissions and partially allowing replacing existing files due weak file permissions (CVE-2018-12979) which can result in an authentication bypass.