JVN#56648919: "Rakuten Ichiba App" fails to restrict custom URL schemes properly

“Rakuten Ichiba App” provided by Rakuten Group, Inc. provides the function to access a requested URL using Custom URL Scheme. The App does not restrict access to the function properly (CWE-939) which may be exploited to direct the App to access any sites.

Impact

A remote attacker may lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

Solution

Update the application
Update the application to the latest version according to the information provided by the developer.

Products Affected

• “Rakuten Ichiba App” for Android versions 12.4.0 and earlier
• “Rakuten Ichiba App” for iOS versions 11.7.0 and earlier