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The first group of 19 vulnerabilities, 2017-12-01, also includes a flaw in the framework section, which could enable a local malicious application to bypass user interaction requirements to gain access to additional permissions.
Google said among the most severe of these flaws is a critical security vulnerability in the media framework that could enable a remote attacker, using a specially crafted file, to execute arbitrary code within the context of a privileged process.
The other key, known as the public key, is intended to be shared with the world.
However, there must be a way for the owner of the key to tell the world who the key belongs to. A digital certificate is a tamperproof piece of data that packages a public key together with information about it (who owns it, what it can be used for, when it expires, and so forth). Certificates are used primarily to verify the identity of a person or device, authenticate a service, or encrypt files.
Google said exploiting issues on Android is made more difficult by features in newer versions of the Android platform: "We encourage all users to update to the latest version of Android where possible." However, not all Android makers feel that updating old hardware to the newest version of Android is a particular priority, leaving many smartphones languishing on older and therefore less secure versions.
Android's big problem: Over a billion devices are more than two years out of date Android's rapid growth and update challenges have left over one billion devices running very out of date software.