During BlackHat EU 2017, myself and Collin Mulliner presented on Android SafetyNet Attestation. The presentation covered what SafetyNet is, why would Android developers use attestation, some of the checks it does and certain weaknesses it currently has. I have blogged on this topic several times. So, here are the slides. Let me know if you have any questions, would be happy to answer. »
This post is part of a series: Inside SafetyNet part 1 (Oct 2015) Inside SafetyNet part 2 (Feb 2016) Inside SafetyNet part 3 (Nov 2016) How to implement Attestation securely using server-side checks (my blog, Cigital blog) SafetyNet Playground (POC server-side implementation) Play Store - Android source - PHP source It’s been more than 8 months since my last blog post on Android’s SafetyNet. In that post I was describing an end-of-2015 version of the system (version code 2495818). »
Update: This post was written after he release of suhide v0.01 and documents that version. Scroll further down for some notes on the newer suhide v0.12. ChainFire recently released suhide, a new “root hiding” mod for SuperSU. It is claimed to beat SafetyNet - and it does, for now - no configuration necessary. Here is some proof, using our SafetyNet Playground app: So how does it do it? suhide.zip is flashed to the device through Android recovery. »
This post is part of a series: Inside SafetyNet part 1 (Oct 2015) Inside SafetyNet part 2 (Feb 2016) Inside SafetyNet part 3 (Nov 2016) How to implement Attestation securely using server-side checks (my blog, Cigital blog) SafetyNet Playground (POC server-side implementation) Play Store - Android source - PHP source It’s been six months since my last blog post on Android’s SafetyNet. I was then examining a mid-July 2015 version of the system. »
In a previous blogpost, I described how Google Play’s SafetyNet service is structured, from a technical perspective, diving deep into details and the checks it perfoms on the device. Recap: Google Play’s SafetyNet service allows your application to gain information about the ‘CTS compatibility’ status of the device you are running on. You can think of CTS compatibility as a mix of rooting detection, device tampering detection and active MitM detection. »