examining privacy violations in children’s apps · wi-fi router bssid (mac) android id wi-fi...
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Examining Privacy Violations in Children’s Apps
Irwin Reyes, Primal Wijesekera, Joel Reardon, Amit Elazari Bar On, Abbas Razaghpanah, Narseo Vallina-Rodriguez, Serge Egelman
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automated run-time analysis to observe
how apps actually access and share data
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I. Reyes, P. Wijesekera, J. Reardon, A. Elazari Bar On, A. Razaghpanah, N. Vallina-Rodriguez, S. Egelman. “Won’t Somebody
Think of the Children?” Examining COPPA Compliance at Scale, Privacy Enhancing Technologies Symposium (PETS) 2018
Available at https://appcensus.mobi/about
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PERSONAL INFORMATION PERSISTENT IDENTIFIERS
Owner Email Address Hardware Serial Number
Phone Number IMEI
GPS Latitude/Longitude Wi-Fi MAC
Wi-Fi Router BSSID (MAC) Android ID
Wi-Fi Router SSID (Name) SIM Card ID
Google Services Framework (GSF) ID
Android Advertising ID (AAID)
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US Children’s Online Privacy Protection Act
COPPA
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behavioral advertising X
personal information X
verifiable parental consent ✔
reasonable security measures ✔
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https://play.google.com/about/families/designed-for-families/program-requirements/
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5,855 free “Designed for Families” apps
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57% of “Designed for Families” apps
are in potential violation
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POTENTIAL VIOLATION RATE (n=5,855)
Personal information 4.8%
Non-resettable identifiers 39%
Potentially non-compliant services 19%
Failure to take security measures 40%
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potential violations often arise
from third-party services included with apps
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potential violations persist
due to platform providers not enforcing terms
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39% share the AAID along another identifier,
negating its privacy preserving benefits
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AD PLATFORM VIOLATION OF IDENTIFIER POLICY
> 99%
> 99%
98%
… …
3%
2%
1%
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19% share identifiers or personal information
with services not allowed in children’s apps
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not for children’s apps
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Developer further agrees it will not integrate
the Software into any Application or Beta
Application (i) with end users who Developer
has actual knowledge are under the age of 13,
or (ii) that may be deemed to be a “Web site or
online service directed to children” as defined
under the Children’s Online Privacy Protection
Act of 1998 (“COPPA”) and the regulations
promulgated thereunder.19
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industry self-regulation via safe harbors
has had no measurable positive effect
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POTENTIAL VIOLATION DFF (n=5,855) SAFE HARBOR (n=237)
PERSONAL INFO 4.8% 10%
NON-RESETTABLE IDENTIFIERS 39% 39%
PROHIBITED SERVICES 19% 33%
NO BASIC SECURITY MEASURES 40% 49%
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industry and regulators react
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The app's developers, Tiny Lab
Productions, said in an email that its
apps are “directed for families,” and not
children, because “we see that
grownups and teens plays our games.”
- CNET
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Email from our team to Google
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https://www.nytimes.com/interactive/2018/09/12/technology/kids-apps-data-privacy-google-twitter.html
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https://www.nytimes.com/interactive/2018/09/12/technology/kids-apps-data-privacy-google-twitter.html
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closing recommendations
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regulators: examine the gatekeepers
https://appcensus.mobi
platform providers: stricter security and analysis
app developers: use compliant services
parents: ¯\_(ツ)_/¯
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BACKUP
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DOMAIN APPS SENDING IDs APPS SENDING
NON-AAID IDs
COMPLIANCE WITH
GOOGLE POLICY
doubleclick.net 168 1 99%
lkqd.net 65 1 98%
mopub.com 148 3 97%
… … … …
adcolony.com 557 108 80%
supersonicads.com 465 144 69%
tapjoy.com 98 96 2%
tapjoyads.com 95 94 1%
chartboost.com 859 858 < 1%
greedygame.com 59 59 < 1%
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ROUTER MAC SENT TO DOMAIN APP COUNT
greedygame.com 61
startappservice.com 60
startappexchange.com 57
kochava.com 30
app-nxt.net 13
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2,909 apps used Unity (from DFF corpus of 5,855)
1,068 received “coppaCompliant” flag from Unity server
479 have coppaCompliant=true
589 have coppaCompliant=false
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1,280 apps integrated with Facebook (from DFF corpus of 5,855)
444 sent “coppa” flag to Facebook server
75 have coppa=true
342 have coppa=false
27 have coppa=true and false (both!)
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Supply Partners who sign up using this
website may not provide MoPub with data from
end users under age 13. Supply Partners must
not register for MoPub’s services using this
website if any of their apps are either: (1)
directed to children under age 13 (even if
children are not the app’s primary audience),
or (2) collect information from children that
Supply Partners know are under age 13.
- MoPub Terms of Service
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DFF APPS (n=5,855) SAFE HARBOR APPS (n=237)
SEND IDENTIFIERS 73% 66%
SHARE PERSONAL DATA 4.8% 10%
USE VERBOTEN SDK 19% 33%
DON’T ENCRYPT COMMS 40% 49%
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+
custom android for
logging api calls
lumen app for
network flow analysis
P. Wijesekera, A. Baokar, L. Tsai, J. Reardon, S. Egelman, D. Wagner, K. Beznosov, The Feasibility of Dynamically Granted
Permissions: Aligning Mobile Privacy with User Preferences, IEEE Security and Privacy (Oakland) 2017
A. Razaghpanah, R. Nithyanand, N. Vallina Rodriguez, Srikanth Sundaresan, M. Allman, C. Kreibich, P. Gill, Apps, Trackers,
Privacy, and Regulators: A Global Study of the Mobile Tracking Ecosystem, Network and Distributed System Security (NDSS) 2018
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what was accessed
where it was shared???
input event generatorto explore the appany Android app
dynamic analysis environment
observed app behavior
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current deployment runs 1,000 apps/day
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50% used Unity (from DFF corpus of 5,855)
84% of Unity apps did NOT get coppaCompliant=true
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SDK TOTAL DFF INSTALLS
556M
481M
386M
296M
239M
150M
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40% share identifiers and personal info
without using encrypted HTTP
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Overall, 57% of “Designed for Families” apps
are in potential violation
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