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31 lines
2.2 KiB
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31 lines
2.2 KiB
Markdown
---
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title: "Android VPN Leakage with Secondary User Profiles"
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date: 2022-10-10
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tags: ['Operating Systems', 'Android', 'Privacy']
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author: Tommy
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---
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**Update**: This is no longer reproducible on Android 13 QPR1 and Android 14 Developer Preview 1.
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**Before We Start**...
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I have been aware of this issue for awhile now (since at least Android 11), though I have not done enough testing to see what actually causes the leak nor do I have any workaround at the moment. My guess is that applications which launch early when you log into a secondary profile can bypass the VPN killswitch.
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I have reported it on [Google's issue tracker](https://issuetracker.google.com/issues/252851265).
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## The Leak
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You can reproduce the leak by doing the following:
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1. Create a new user profile (you need to create a secondary user profile for this, as it is not reproducible on your owner profile or a work profile). Do not log into your Google account at this stage.
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2. Sideload a VPN app. The leak happens with every VPN provider I have tried (since it is likely a platform issue), though if you do not have a VPN subscription I would recommend getting a free one with [ProtonVPN](https://protonvpn.com).
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3. Setup the VPN and the [Android VPN killswitch](/posts/os/android-tips/#enable-vpn-killswitch).
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4. Log into your Google account through Play Services.
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5. Restart the phone. Open the secondary user profile again.
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6. Go to Google's [My Devices](https://myaccount.google.com/device-activity) page. Observe that one of the sessions for your phone has your actual location obtained with GeoIP. In some cases, your actual IP address will be shown there as well.
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## Notes
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1. It is unlikely that this is caused by Play Services being privileged applications. This issue is reproducible on GrapheneOS with the Sandboxed Play Services (which runs as a normal, unprivileged application) as well.
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2. More testing is needed to find the root cause of the problem. I do not think that this is Play Services specific. Unfortunately, I do not have access to a router to do a packet capture right now. I would appreciate it if someone can help me get to the bottom of this. You can find my contact information [here](https://tommytran.io/contact/). |