Cydia developer Saurik exploits and fixes Android’s Master Key vulnerability with ‘Impactor’

9To5Google: The severity of the Master Key vunerability (bug #8219321) Bluebox Security discovered has been disputed and folks often are willing to look past theoretical vulnerabilities until a widespread zero day goes public. The original claims were that 99% of Android devices were vulnerable but that has since come down with patches and Google updates. Still, with manufacturers and carriers unable to see the long term value in quick (or any) updates to their phones, a huge amount of Android users are out there, unpatched.