Shelter: Improper authentication in exported activity allows auth_key registration
Shelter versionCode 445 (F-Droid version 1.9.1) exports an activity that accepts intents from any app without a permission. According to a third-party advisory, a local app with no permissions can register its own auth_key on a Shelter instance that was never enrolled and then use the app's binder service and change its preference state. Once a key is enrolled, the stored key is required, so the main risk is during first setup. The NVD score of 9.8 assumes network access, which the advisory does not confirm, so this should be treated as a risk from other apps on the same device.
PeterCxy · Shelter
