Missing Permission Check in onKeyguardVisibilityChanged in key_store_service.cpp Allows Local Escalation of Privilege in Android

CVE-2020-0105

In onKeyguardVisibilityChanged of key_store_service.cpp, there is a missing permission check. This could lead to local escalation of privilege, allowing apps to use keyguard-bound keys when the screen is locked, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-9 Android-10Android ID: A-144285084

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