الفهرس 
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Abstract
The increasing speed, power and storage space on mobile devices has led to increasing the use of these devices in online shopping, managing the finances and paying the bills.Thus, the mobile devices become a valuable target for cybercriminals. It becomes necessary to provide a reliable and easy technique for securing these mobile devices against unauthorized access and diverse attacks. In the past years, we’ve seen how major vulnerabilities in the Android OS changed how Google looks at security updates. This report discusses the mobile devices security, mobile threat classifications, and Android OS security structure and enhancements. It presents the vulnerabilities in the Android OS, and their corresponding Google security updates. It studies one of the Android’s most notorious vulnerabilities called Stage fright. The report presents the implementation of this vulnerability on real device using different techniques. The results show that the Stage fright attack can access the shell of the mobile in order to access its data.