JVN#38034268: あすけん App for Android fails to restrict custom URL schemes properly

あすけん App for Android by asken 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

• あすけん App for Android versions from v.3.0.0 to v.4.2.x
  Note that あすけん App is only available in Japan.