AudioCodes 400HD Series - Screen Lock; Audiocodes Private Key; Android Debug Bridge (ADB); App Signing

CHAPTER1 Overview
C448HD C450HD | Users & Administrator's Manual
■ OnlyspecificMicrosoftappsandAudioCodes-signedappsthatwerecertifiedandapproved
inthecertificationprocesscanruninKioskmode;evenifamalicioususermanagesto
installanewunauthorizedapponthefilesystem,thelauncheronthedevicewillonlyrun
thosespecificapprovedappsandthiscannotbechangedinruntime(onlywithanew
softwarecodeprovidedbyAudioCodes).
Screen Lock
AudioCodesdevicesuseascreenlockmechanismtopreventanymalicioususer/usersfrom
gainingaccesstoCalendarinformationand/orActiveDirectorylistofemployeesand/or
triggering  unauthorized  calls  from  the  device.  After  enabling  screen  lock,  the  device 
automaticallylocksafterapreconfiguredperiod;acodeisrequiredtounlockthedeviceand
resumefulloperation.
AudioCodes Private Key
ThesystemsoftwareonAudioCodesdevicesissignedwithAudioCodes'privatekey.Userscan
replace the complete software only withnew software that is also  signed by AudioCodes' 
privatekey.
Thispreventsusersfromreplacingthecompleteover-the-air(OTA)packageofthedevicewith
anynewsystemsoftware,unlessthesoftwareisfullysignedbyAudioCodes.
Android Debug Bridge (ADB)
The device does not allow access to ADB.
AudioCodesdisabledtheAndroidDebugBridge(ADB)applicationandkeepstheTeamsapp
runninginthefrontallthetime.Asaresult,it'simpossibletoinstallotherappsfromunknown
sources,andtosideloadapps.
App Signing
Android  requires  all  apps  to  be  digitally- signed  with  a  developer  key  before  installation; 
currently,theAudioCodesdevicesverifythatappsaresignedbyMicrosoft.
Appsigningpreventsmalicioususer/usersfromreplacingaMicrosoft-signedappwithanapp
that"pretends"tobeMicrosoftbutwhichlackstheprivatekeythatisknownonlytoMicrosoft.
Web Browser
TheAudioCodesdevicedoesnotincludeaWebbrowser.Userscannotbrowsetothepublic
internetorinternalintranet.AllWebservicesarecustomizedtoconnecttoOffice365services
andAudioCodes'managedservicessuchastheOneVoiceOperationsCenter(OVOC).
WithoutaWebbrowser,malicioususer/userswillnotbeabletoaccessthedeviceandbrowse
fromitasatrusteddeviceintothecustomernetwork.
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