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DNS traffic can leak outside the VPN tunnel on Android
We were recently made aware of multiple potential DNS leaks on Android. They stem from bugs in Android itself, and only affect certain apps.
We can potentially minimize the amount of times a tunnel re-configuration happens, but we currently don’t think this leak can be fully prevented. These finding also shows once again that “Block connections without VPN” does not live up to its name (or documentation) and that it has multiple flaws. Depending on your threat model this might mean that you should avoid using Android altogether for anything sensitive, or employ other mitigations to prevent the leaks.
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