Device Host Security Considerations

Using the device host creates security issues because of the following:

  • Devices hosted on a computer running Windows XP sends announcements on all networks.
  • Devices hosted on a computer running Windows XP allow control of devices from all networks.

This increases the risk to home consumers, because devices such as a media player or a bridged lighting or HVAC system hosted on a computer running Windows XP are visible and can be controlled from control points outside the home.

When you are creating a hosted device, you need to take into consideration some security issues.

  • To reduce the scope of discovery and attack of UPnP-based devices, the TTL of all SSDP messages is 1. This means that a registered device is only discovered by control points on the same network. You can configure a higher TTL in the registry.
  • Registering a non-running device requires pre-registering the device .dll with COM, which requires administrator privilege.
  • Registering a running device requires Administrator, Local Service, or Local System privilege.
  • When the device host is started, it is run as LocalService. This gives the device the ability to generate audits and read the HKEY_LOCAL_MACHINE registry key. The device does have access to HKEY_CURRENT_USER. The LocalService account can use resources to which LocalService has been granted access, as well as those that grant access to AuthenticatedUser. The device has restricted file system access.
  • The file system ACLs must be updated to allow LocalService access to the resource directory.
  • If your device must have more security access, you can create your own process for the device and register it by using IUPnPRegistrar::RegisterRunningDevice.

 

 

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