Why UPnP is awesome and terrifying
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© 2012 Presented by: Why UPnP is Awesome …and Terrifying Daniel Crowley
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An explanation of how UPnP works, and why it is an inherently dangerous protocol.
Transcript of Why UPnP is awesome and terrifying
© 2012
Presented by:
Why UPnP is Awesome…and Terrifying
Daniel Crowley
© 2012
Who am I?
• Daniel Crowley• Managing Consultant• Trustwave – SpiderLabs - AppSec• [email protected]• @dan_crowley
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How UPnP works
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Phases of UPnP Protocol
• Addressing• Discovery• Description• Control• Eventing• Presentation
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Addressing
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Addressing
• Acquire network address–DHCP
• Associate with multicast group
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Discovery
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Discovery
• M-SEARCH (request)–HTTPMU•Multicast•UDP
–Port 1900
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Discovery – M-SEARCH
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Discovery – M-SEARCH
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Discovery
• NOTIFY–HTTPMU•Multicast•UDP
–Port 1900
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Discovery - NOTIFY
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Description
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Description
• Unicast HTTP• Grab/parse UPnP description xml files
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Control
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Control
• Unicast HTTP• SOAP
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Eventing
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Eventing
• GENA– HTTP based
• SUBSCRIBE, POLL and NOTIFY• May be implemented by UPnP device
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Presentation
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Presentation
• Description phase provides root XML file• Root XML file can contain presentation URI• URI is HTTP resource for alternate control or
view
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Awesome
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Awesome
• Kittens• Missiles
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Why it’s awesome
• Universal control protocol–Traditional network devices–Network-attached devices–AV Gear
• Ease of device deployment–Self-configuring devices
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Terrifying
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Terrifying
• No authentication built in– DeviceProtection– UPnP security
• Some actions exposed are awful– RunLua– SetDNSServer– UpdateFirmware
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Remote Keystrokes?
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Arm/Disarm Alarm System?
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Add entry PINs to door lock?
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Terrifying
• Being used for:– Door Locks– Security Cameras– Motion Sensors– Alarm Systems– Electrical Outlets
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Terrifying
• Control is built on Unicast HTTP–CSRF• Javascript• Flash• Silverlight
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UPnP Daemons
• Full
•Of
•Holes
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Flaws in UPnP actions
• Traditional application security flaws–Shell injection–Memory corruption
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DemoBelkin WeMo
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DemoBubbleUPnP
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Bibliography
• http://technet.microsoft.com/en-us/library/bb727027.aspx
• http://tools.ietf.org/html/draft-cohen-gena-p-base-01
• http://tools.ietf.org/html/draft-cohen-gena-client-00
• http://www.upnp-hacks.org
