Master key’ bug allows attackers to modify the code of any app without breaking its cryptographic signature. 99 percent of all Android users are at risk of unknowingly downloading malware. Bluebox Security has released an app that scans the users device and tells them whether their Android installation has already been patched or still sports the vulnerability. The app is available for download from Google Play, Amazon AppStore for Android and GetJar, and is available on Google Play and Amazon App Store for Android.”]
Source: https://informationsecuritybuzz.com/news/bluebox-releases-free-scanner-for-android-master-key-bug/