Since social applications involve various types of information related to the user privacy, events of privacy leakage occur frequently along with their popular applications and few studies are available on the privacy leakage detection for social applications. With the combination of the characteristics of the Android system as well as the exploitation of the taint tracking technology and Xposed framework, a privacy leakage detection tool named X-Decaf (Xposed-based-detecting-cache-file) is proposed, which is oriented to social applications on Android platform. It suspects the leakage paths within the applications and detects the privacy data’s cache files. This paper also presents a suggestion for the evaluation of the privacy leakage. Evaluation results of 50 kinds of Android social applications show that many vulnerabilities of user privacy leakage exist in the social applications on Android platform.
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