Google Duo (Android / Google Play)

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This application is available for Android. This app is designed to be simplest video call only application. The latest build was released on July 6, 2017. Our latest check was performed on Feb 10th, 2017.

Findings Summary

Our examination revealed total 16 items, where were 8 DAR items and 8 DIT items found. Among DAR items were found 0 worst items, 6 bad items, 0 good items, and 1 best item. Among DIT items were found 0 worst items, 0 bad items, 8 good items, and 0 best items.

Below you find 3 infographics summarizing what we described above. Each image provides information about both DAR and DIT items.

 

 

 

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Everything presented below is related to well-known CWEs, such as Sensitive data leakage [CWE-200], Unsafe sensitive data storage [CWE-312], Unsafe sensitive data transmission [CWE-319]. You can read more about it here.

Now let’s go deeper and examine each data item’s protection level.

 

Application Description

Let’s cite the description of this application below:

Duo is a one-to-one video calling app for everyone – designed to be simple, reliable and fun so you never miss a moment.

Features:

  • Simple interface
    Pick a loved one and jump right in, with a simple interface that brings video to the forefront.
  • Knock Knock
    See the caller before you pick up with Duo’s live preview feature.
  • High quality video
    Experience faster and more reliable video calls whether you’re on Wi-Fi or on-the-go.
  • Cross-platform
    Video call all your friends across Android and iOS with just one simple app.
  • Audio Calls
    Make audio-only calls to your friends when you can’t have a video call.

*Data charges may apply. Check your carrier for details.

 

Protection levels.

Locally stored data (Data-at-Rest, DAR).

Locally stored data groups include Call Information, Application Information, Account Information, Credentials Information, Log Information, Address Book ‘n’ Contact Information.
The average DAR value is 3.50 points (7.00 points of system protection and 0.00 points of own protection). It equals to a typical value (3.5 points, where’s 7 points of system protection and 0 points of own protection).

Items with average value 3.50 points (7 points of system protection, 0 points of own protection) means data protection levels have following definitions. Frankly talking, extra data found that shouldn’t be accessed where system protection level means – root/jailbreak is required but not possible without wiping device data, and own protection level means – stored as is.

– Call History (‘Call Information’ Group) – Some info about calls you made like phone number, name, date and time, and type of call (missed, placed, outgoing, etc.). This data item related to mentioned group meant to be any call info stored, cached or transferred in plain text or media files,

– Application Configs (‘Application Information’ Group) – Different configuration files created by your app, perhaps app permissions. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers,

– Account Data (‘Account Information’ Group) – Basic info about account like name, a list of sub-account (e.g. financial or other) and some linked data like a phone number. This data item related to mentioned group meant to be any info related to profiles, basic credential IDs like email or username or phone number plus some more info depends on applications,

– Credentials (IDs) (‘Credentials Information’ Group) – Only account IDs like app or 3rd party user IDs including emails, phone number, usernames, etc. (depends on apps). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Log Data (‘Log Information’ Group) – Logged any data as a solid file or multipart files. This data item related to mentioned group meant to be any information stored in local or network logs,

– Contact Short Profile (‘Address Book ‘n’ Contact Information’ Group) – Name, Email ID, Phone number of contacts. This data item related to mentioned group meant to be info locally stored, cached or transferred over the network and belong to this application if it’s social even,

– Access Permissions (‘Application Information’ Group) – The list of permissions linked to access token used to get access to some features of service. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers

Keep in mind if you’re using some Android devices such Samsung, LG or another device with an unlocked or non-locked loader that allow rooting your device without user action, the system level equals 6 points instead of 7. It means your data can be stolen without involving your actions.

Transferred data (Data-in-Transit, DIT).

Transferred data groups include Device Information, Credentials Information, Address Book ‘n’ Contact Information, Message Information, Media Information.
The average DIT value is 6.13 points (6.00 points of system protection and 6.25 points of own protection). It is higher than a typical value (4 points, where’s 4 points of system protection and 4 points of own protection).

Items’ GROUP #1 with average value 5.00 points (6 points of system protection, 4 points of own protection) means data protection levels have following definitions. Frankly talking, data is not available all the time or partially accessed where system protection level means – MITM prevented or fake certificate importing prevented, but plaintext non-protected traffic is intercepted, and own protection level means – bypassed by fake/stolen root certificates.

– Device Data (‘Device Information’ Group) – Device ID, Device Name, Device OS Name and Version, and jailbroken/root status. This data item related to mentioned group meant to be details about your device,

– Locale ‘n’ TimeZone (‘Device Information’ Group) – Details about your locale, languages, time zone, country and so on. This data item related to mentioned group meant to be details about your device

Items’ GROUP #2 with average value 6.50 points (6 points of system protection, 7 points of own protection) means data protection levels have following definitions. Frankly talking, protection and privacy issues are still possible but might involve interaction with an app code where system protection level means – MITM prevented or fake certificate importing prevented, but plaintext non-protected traffic is intercepted, and own protection level means – tricks to bypass sniffing (hardly to be or can’t be patched to bypass), including non-common or unsupported protocols.

– Credentials (Activation IDs) (‘Credentials Information’ Group) – Two-factor activation code received in messages. This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Credentials (IDs) (‘Credentials Information’ Group) – Only account IDs like app or 3rd party user IDs including emails, phone number, usernames, etc. (depends on apps). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Credentials (Tokens) (‘Credentials Information’ Group) – Different tokens used to get access to your account, except for passwords but including app or 3rd party tokens, secret keys, etc. (usually give full access to your account). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Contact Short Profile (‘Address Book ‘n’ Contact Information’ Group) – Name, Email ID, Phone number of contacts. This data item related to mentioned group meant to be info locally stored, cached or transferred over the network and belong to this application if it’s social even,

– Messages (‘Message Information’ Group) – Different types of messages, conversations, except for SMS, MMS but including recipient and sender IDs and attachments. This data item related to mentioned group meant to be all message, including SMS, MMS, social and IM messages with or without attachments,

– Call Stream (‘Media Information’ Group) – Audio or Video call streaming between two or more users. This data item related to mentioned group meant to be any data like photo, image, video, audio

Keep in mind if you’re using out-of-date Android < 7.0, the system level equals 4 points instead of 6. It means your data can be stolen with a crafted preinstalled certificate on the device or if someone makes you install a certificate. Also, if you’re using out-of-date Android < 5.0, the system level equals 2 points instead of 4. It means your data can be stolen without involving your actions.

Privacy Policy

Full application privacy policy is available here.

You may find privacy policy details proceeding the link above to compare developer’s vision on data protection with our results.