Exposed AIDL service allowing to read and delete files with system-level privileges in Bluebird filemanager application

Bluebird devices contain a pre-loaded file manager application. This application exposes an unsecured service provider "com.bluebird.system.koreanpost.IsdcardRemoteService". A local attacker can bind to the AIDL-type service to copy and delete arbitrary files from device's storage with system-level permissions. Version 1.4.4 is vulnerable, vendor reverted vulnerable versions to older version: 1.3.6