CVE-2024-54014

Improper authorization in handler for custom URL scheme issue in Skylark App for Android 6.2.13 and earlier and Skylark App for iOS 6.2.13 and earlier allows an attacker to lead the application to access an arbitrary web site via another application installed on the users device.

Weakness

The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.

Potential Mitigations

• Utilize a user prompt pop-up to authorize potentially harmful actions such as those modifying data or dealing with sensitive information.
• When designing functionality of actions in the URL scheme, consider whether the action should be accessible to all mobile applications, or if an allowlist of applications to interface with is appropriate.

References

• https://apps.apple.com/jp/app/%E3%81%99%E3%81%8B%E3%81%84%E3%82%89%E3%83%BC%E3%81%8F%E3%82%A2%E3%83%97%E3%83%AA/id906930478
• https://jvn.jp/en/jp/JVN03447226/
• https://play.google.com/store/apps/details?id=jp.co.skylark.app.gusto