An attacker who can spoof the IP address and the User-Agent of a logged-in user can takeover the session because of flaws in the self-developed session management. If two users access the web interface from the same IP they are logged in as the other user.

The password change function at /cgi/admin.cgi does not require the current/old password, which makes the application vulnerable to account takeover. An attacker can use this to forcefully set a new password within the -rsetpass+-aaction+- parameter for a user without knowing the old password, e.g. by exploiting a CSRF issue.

Due to missing input sanitization, an attacker can perform cross-site-scripting attacks and run arbitrary Javascript in the browser of other users. The "Edit Disclaimer Text" function of the configuration menu is vulnerable to stored XSS. Only the users Poweruser and Admin can use this function which is available at the URL https://$SCANNER/cgi/admin.cgi?-rdisclaimer+-apre The stored Javascript payload will be executed every time the ScanWizard is loaded, even in the Kiosk-mode browser.

Due to missing input sanitization, an attacker can perform cross-site-scripting attacks and run arbitrary Javascript in the browser of other users. The "Edit Disclaimer Text" function of the configuration menu is vulnerable to stored XSS. Only the users Poweruser and Admin can use this function which is available at the URL https://$SCANNER/cgi/admin.cgi?-rdisclaimer+-apre The stored Javascript payload will be executed every time the ScanWizard is loaded, even in the Kiosk-mode browser. Version 7.40 implemented a fix, but it could be bypassed via URL-encoding the Javascript payload again.

Due to missing input sanitization, an attacker can perform cross-site-scripting attacks and run arbitrary Javascript in the browser of other users. The login page at /cgi/slogin.cgi suffers from XSS due to improper input filtering of the -tsetup+-uuser parameter, which can only be exploited if the target user is not already logged in. This makes it ideal for login form phishing attempts.

Due to missing input sanitization, an attacker can perform cross-site-scripting attacks and run arbitrary Javascript in the browser of other users. The "File Name" page (/cgi/uset.cgi?-cfilename) in the User Settings menu improperly filters the "file name" and wildcard character input field. By exploiting the wildcard character feature, attackers are able to store arbitrary Javascript code which is being triggered if the page is viewed afterwards, e.g. by higher privileged users such as admins. This attack can even be performed without being logged in because the affected functions are not fully protected. Without logging in, only the file name parameter of the "Default" User can be changed.

The web application is not protected against cross-site request forgery attacks. Therefore, an attacker can trick users into performing actions on the application when they visit an attacker-controlled website or click on a malicious link. E.g. an attacker can forge malicious links to reset the admin password or create new users.

The scanner device boots into a kiosk mode by default and opens the Scan2Net interface in a browser window. This browser is run with the permissions of the root user. There are also several other applications running as root user. This can be confirmed by running "ps aux" as the root user and observing the output.

The www-data user can elevate its privileges because sudo is configured to allow the execution of the mount command as root without a password. Therefore, the privileges can be escalated to the root user. The risk has been accepted by the vendor and won't be fixed in the near future.

If the attacker has access to a valid Poweruser session, remote code execution is possible because specially crafted valid PNG files with injected PHP content can be uploaded as desktop backgrounds or lock screens. After the upload, the PHP script is available in the web root. The PHP code executes once the uploaded file is accessed. This allows the execution of arbitrary PHP code and OS commands on the device as "www-data".