{"id":105418,"date":"2015-03-24T05:00:17","date_gmt":"2015-03-24T12:00:17","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=105418"},"modified":"2021-03-17T00:52:33","modified_gmt":"2021-03-17T07:52:33","slug":"android-installer-hijacking-vulnerability-could-expose-android-users-to-malware","status":"publish","type":"post","link":"https:\/\/origin-unit42.paloaltonetworks.com\/ja\/android-installer-hijacking-vulnerability-could-expose-android-users-to-malware\/","title":{"rendered":"\u300cANDROID INSTALLER HIJACKING\u300d\u8106\u5f31\u6027\u306b\u3088\u308a ANDROID\u30e6\u30fc\u30b6\u30fc\u306b\u30de\u30eb\u30a6\u30a7\u30a2\u611f\u67d3\u306e\u6050\u308c"},"content":{"rendered":"<h2><strong>\u6982\u8981<\/strong><\/h2>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u3001Google\u306eAndroid OS\u306e\u8106\u5f31\u6027\u300cAndroid Installer Hijacking\u300d\u3092\u767a\u898b\u3057\u307e\u3057\u305f\u3002 \u3053\u308c\u306b\u3088\u308a\u3001\u73fe\u5728\u306eAndroid\u30e6\u30fc\u30b6\u30fc\u306e49.5%\u304c\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2><strong>\u8a73\u7d30<\/strong><\/h2>\n<ul>\n<li>\u653b\u6483\u8005\u304c\u300cAndroid Installer Hijacking\u300d(Android\u30a4\u30f3\u30b9\u30c8\u30fc\u30e9\u30fc\u4e57\u3063\u53d6\u308a)\u306e\u8106\u5f31\u6027\u3092\u5229\u7528\u3059\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u554f\u984c\u306e\u306a\u3044Android\u30a2\u30d7\u30ea\u3092\u30e6\u30fc\u30b6\u30fc\u306e\u77e5\u3089\u306a\u3044\u9593\u306b\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<li>\u3053\u308c\u3067\u5f71\u97ff\u3092\u53d7\u3051\u308b\u306e\u306f\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30a2\u30d7\u30ea \u30b9\u30c8\u30a2\u304b\u3089\u30a2\u30d7\u30ea\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u5834\u5408\u306e\u307f\u3067\u3059\u3002<\/li>\n<li>\u60aa\u610f\u306e\u3042\u308b\u30a2\u30d7\u30ea\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u540d\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u306a\u3069\u306e\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u30c7\u30fc\u30bf\u3092\u542b\u3081\u3001\u611f\u67d3\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u306b\u30d5\u30eb \u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u3067\u306f\u3001Google\u3001Samsung\u3001Amazon\u306a\u3069\u306e\u5927\u624b\u4f01\u696d\u3068\u9023\u643a\u3057\u3066\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u901a\u77e5\u3068\u5404\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u3059\u308b\u30d1\u30c3\u30c1\u306e\u767a\u884c\u3092\u884c\u3044\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n<h3><strong>\u80cc\u666f<\/strong><\/h3>\n<p>2014\u5e741\u6708\u3001\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306fAndroid OS\u306e<a href=\"https:\/\/en.wikipedia.org\/wiki\/Time_of_check_to_time_of_use\"><em>Time-of-Check to Time-of-Use<\/em>\u00a0(<em>TOCTTOU<\/em>) \u8106\u5f31\u6027<\/a>\u3092\u767a\u898b\u3057\u307e\u3057\u305f\u3002\u653b\u6483\u8005\u304c\u3053\u308c\u3092\u5229\u7528\u3059\u308b\u3068\u3001\u901a\u5e38\u306eAPK\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30d7\u30ed\u30bb\u30b9\u3092\u4e57\u3063\u53d6\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u4e57\u3063\u53d6\u308a\u30c6\u30af\u30cb\u30c3\u30af\u306f\u3001\u30e6\u30fc\u30b6\u30fc \u30d3\u30e5\u30fc\u3092\u56de\u907f\u3057\u3066\u3001\u6063\u610f\u7684\u306a\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u3092\u6c42\u3081\u308b\u30de\u30eb\u30a6\u30a7\u30a2\u3092\u914d\u5e03\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u666e\u901a\u306e\u30a2\u30d7\u30ea\u3092\u5225\u306e\u30a2\u30d7\u30ea\u306b\u7f6e\u304d\u63db\u3048\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u6b63\u898f\u7248\u306e\u30b2\u30fc\u30e0 \u30a2\u30d7\u30ea\u300c\u30a2\u30f3\u30b0\u30ea\u30fc\u30d0\u30fc\u30c9\u300d\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u306b\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u611f\u67d3\u3057\u305f\u5225\u306eFlashlight\u30a2\u30d7\u30ea\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u3053\u306e\u8106\u5f31\u6027\u3092\u5229\u7528\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\u3092\u300cAndroid Installer Hijacking\u300d\u3068\u540d\u4ed8\u3051\u307e\u3057\u305f\u3002Google\u3001Samsung\u3001Amazon\u306a\u3069\u306e\u5927\u624b\u4f01\u696d\u3068\u9023\u643a\u3057\u3066\u5f71\u97ff\u3092\u53d7\u3051\u308b\u5404\u30c7\u30d0\u30a4\u30b9\u306b\u5bfe\u3059\u308b\u30d1\u30c3\u30c1\u306e\u767a\u884c\u3092\u884c\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<h3><strong>\u8106\u5f31\u6027\u306e\u8aac\u660e<\/strong><\/h3>\n<p>\u3053\u306e\u3057\u304f\u307f\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u3001\u307e\u305aAndroid\u3067\u306e\u30a2\u30d7\u30ea\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u65b9\u6cd5\u304b\u3089\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002Android\u3067\u306f\u3001Google Play Store\u304a\u3088\u3073\u30ed\u30fc\u30ab\u30eb \u30d5\u30a1\u30a4\u30eb \u30b7\u30b9\u30c6\u30e0\u304b\u3089\u306e\u30a2\u30d7\u30ea\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u304c\u3067\u304d\u307e\u3059\u3002Google Play\u3067\u306f\u3001Android\u30d1\u30c3\u30b1\u30fc\u30b8(APK)\u3092\u30d5\u30a1\u30a4\u30eb \u30b7\u30b9\u30c6\u30e0\u306e\u4fdd\u8b77\u3055\u308c\u305f\u30b9\u30da\u30fc\u30b9\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u307e\u3059\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30a2\u30d7\u30ea \u30b9\u30c8\u30a2\u3084\u30e2\u30d0\u30a4\u30eb\u5e83\u544a\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u901a\u5e38\u3001APK\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30ed\u30fc\u30ab\u30eb \u30b9\u30c8\u30ec\u30fc\u30b8(\/sdcard\/\u306a\u3069)\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u304b\u3001\u307e\u305f\u306f\u76f4\u63a5\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002\u3069\u3061\u3089\u306e\u5834\u5408\u3067\u3082\u3001\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u5b8c\u4e86\u3059\u308b\u306e\u306fPackageInstaller\u3068\u547c\u3070\u308c\u308b\u30b7\u30b9\u30c6\u30e0 \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<p>\u611f\u67d3\u3057\u305f\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306f\u3001PackageInstaller\u306b\u300cTime of Check to Time of Use\u300d\u8106\u5f31\u6027\u304c\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u308f\u304b\u308a\u3084\u3059\u304f\u8a00\u3048\u3070\u3001APK\u30d5\u30a1\u30a4\u30eb\u304c\u30e6\u30fc\u30b6\u30fc\u306e\u77e5\u3089\u306a\u3044\u9593\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u6642\u306b\u66f8\u304d\u63db\u3048\u3089\u308c\u305f\u308a\u7f6e\u304d\u63db\u3048\u3055\u308c\u305f\u308a\u3059\u308b\u306e\u3067\u3059\u3002\u300cInstaller Hijacking\u300d\u8106\u5f31\u6027\u306f\u3001 \u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30ed\u30fc\u30ab\u30eb \u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u305fAPK\u30d5\u30a1\u30a4\u30eb\u306b\u306e\u307f\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002Play Store\u306e\u30a2\u30d7\u30ea\u306f\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u305f\u4ed6\u306e\u30a2\u30d7\u30ea\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h3><strong>\u8a73\u7d30\u89e3\u8aac<\/strong><\/h3>\n<p>Android\u3067\u306f\u3001\u30a2\u30d7\u30ea \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30d7\u30ed\u30bb\u30b9\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u65b9\u6cd5\u306f\u8907\u6570\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u305fAPK\u30d5\u30a1\u30a4\u30eb\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u304d\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30a2\u30d7\u30ea \u30b9\u30c8\u30a2\u304b\u3089\u30a2\u30d7\u30ea\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u3068\u304d\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30e2\u30d0\u30a4\u30eb\u5e83\u544a\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30db\u30b9\u30c8\u3059\u308b\u30a2\u30d7\u30ea\u8ca9\u4fc3\u5e83\u544a\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u304d\u3001\u306a\u3069\u3067\u3059\u3002\u3069\u306e\u65b9\u6cd5\u3067\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u3066\u3082\u3001APK\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30d7\u30ed\u30bb\u30b9\u306f\u5e38\u306b\u540c\u3058\u624b\u9806\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u30b7\u30b9\u30c6\u30e0 \u30b5\u30fc\u30d3\u30b9PackageInstaller\u306f\u3001APK\u30d5\u30a1\u30a4\u30eb\u3092\u89e3\u6790\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30d7\u30ed\u30bb\u30b9\u3092\u958b\u59cb\u3057\u3001\u30a2\u30d7\u30ea\u540d\u3001\u30a2\u30d7\u30ea 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Check\u300d)<\/span><\/em><\/p>\n<p>\u3053\u308c\u304c\u300cTime to Check\u300d(\u30c1\u30a7\u30c3\u30af\u306e\u6642\u9593) \u3067\u3059\u3002\u3053\u306e\u9593\u306b\u672c\u5f53\u306b\u30a2\u30d7\u30ea\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u3044\u306e\u304b\u3001\u30a2\u30d7\u30ea\u306b\u3069\u306e\u3088\u3046\u306a\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u3092\u4e0e\u3048\u308b\u306e\u304b\u3092\u30e6\u30fc\u30b6\u30fc\u306b\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3059\u3079\u3066\u306eAndroid\u30a2\u30d7\u30ea\u306f\u3053\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u5b9f\u884c\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306f[\u6b21\u3078]\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u306e\u5168\u30ea\u30b9\u30c8\u3092\u8868\u793a\u3057\u3066\u78ba\u8a8d\u3057\u3001\u6700\u5f8c\u306b[\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb]\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30d7\u30ed\u30bb\u30b9\u3092\u7d9a\u884c\u3057\u307e\u3059(\u56f31\u53c2\u7167)\u3002<\/p>\n<p>\u8106\u5f31\u6027\u304c\u5b58\u5728\u3059\u308b\u306e\u306f\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u3053\u306e\u60c5\u5831\u3092\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u3044\u308b\u9593\u306b\u3001\u653b\u6483\u8005\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u66f8\u304d\u63db\u3048\u305f\u308a\u3001\u7f6e\u304d\u63db\u3048\u305f\u308a\u3057\u307e\u3059\u3002AOSP\u306b\u516c\u958b\u3055\u308c\u305fAndroid OS\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u691c\u8a3c\u3057\u305f\u3068\u3053\u308d\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\u306ePackageInstaller\u306f\u300cTime of Use\u300d(\u4f7f\u7528\u306e\u6642\u9593)\u306bAPK\u30d5\u30a1\u30a4\u30eb\u3092\u691c\u8a3c\u3057\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u300cTime of 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\u30a2\u30d7\u30ea\u306a\u3069)\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3088\u3046\u30e6\u30fc\u30b6\u30fc\u306b\u4fc3\u3057\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u30a2\u30d7\u30ea\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3068\u3001PackageInstallerActivity\u30d3\u30e5\u30fc\u304c\u958b\u59cb\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u5148\u307b\u3069\u898b\u305f\u3088\u3046\u306b\u3001\u300cApp Y\u300d\u306e\u91cd\u8981\u60c5\u5831\u304cPackageInstallerActivity\u30d3\u30e5\u30fc\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u300cApp Y\u300d\u306f\u3044\u3064\u3082\u3068\u7570\u306a\u308b\u3088\u3046\u306a\u3053\u3068\u306f\u4f55\u3082\u8981\u6c42\u3057\u3066\u3044\u306a\u3044\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002\u5b9f\u969b\u3001\u300cApp Y\u300d\u306f\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u3092\u307e\u3063\u305f\u304f\u8981\u6c42\u3057\u306a\u3044\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u30fc\u30b6\u30fc\u304cPackageInstallerActivity\u3092\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u3044\u308b\u9593\u306b\u3001\u300cApp X\u300d\u306f\u300cApp Y\u300d\u306eAPK\u30d5\u30a1\u30a4\u30eb\u3092\u30de\u30eb\u30a6\u30a7\u30a2\u3067\u66f8\u304d\u63db\u3048\u307e\u3059\u3002<\/li>\n<li>\u30e6\u30fc\u30b6\u30fc\u304c[\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb]\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u5b9f\u969b\u306b\u8981\u6c42\u3055\u308c\u305f\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u3092\u7121\u8996\u3057\u3066\u3001\u6539\u3056\u3093\u3055\u308c\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u300cApp Y\u300d\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u5b9f\u969b\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u305f\u30a2\u30d7\u30ea\u306f\u3001\u300cApp Y\u300d\u3068\u306f\u95a2\u9023\u6027\u3082\u985e\u4f3c\u70b9\u3082\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<h3><strong>\u5f71\u97ff<\/strong><\/h3>\n<p>\u3053\u306e\u8106\u5f31\u6027\u306f\u3001Android\u30c7\u30d0\u30a4\u30b9 \u30e6\u30fc\u30b6\u30fc\u3060\u3051\u3067\u306a\u304f\u3001Android\u30a2\u30d7\u30ea\u958b\u767a\u8005\u306b\u3082\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002<\/p>\n<p>Android\u30c7\u30d0\u30a4\u30b9 \u30e6\u30fc\u30b6\u30fc\u306f\u3001\u81ea\u5206\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3064\u3082\u308a\u306e\u306a\u3044\u30a2\u30d7\u30ea\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u306f\u3081\u306b\u9665\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Android\u30a2\u30d7\u30ea\u958b\u767a\u8005\u3082\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002Google Play Store\u3092\u7d4c\u7531\u3057\u306a\u3044\u30a2\u30d7\u30ea \u30b9\u30c8\u30a2\u306e\u30a2\u30d7\u30ea\u3084\u30e2\u30d0\u30a4\u30eb\u5e83\u544a\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3001\u5f53\u8a72\u30a2\u30d7\u30ea\u3092\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30b9\u30c8\u30ec\u30fc\u30b8(\/sdcard\u306a\u3069)\u3078\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002Amazon AppStore\u30a2\u30d7\u30ea\u306e\u4f8b\u3067\u898b\u305f\u3088\u3046\u306b\u3001\/sdcard\u306a\u3069\u306e\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30b9\u30c8\u30ec\u30fc\u30b8\u3067\u306f\u3001\u653b\u6483\u8005\u304c\u5f53\u8a72\u30a2\u30d7\u30ea\u3092\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4e21\u65b9\u306e\u60aa\u7528\u306e\u30c6\u30b9\u30c8\u3092Android 2.3\u30014.0.3-4.0.4\u30014.1.X\u3001\u304a\u3088\u30734.2.x\u4e0a\u3067\u884c\u3044\u3001\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<a href=\"https:\/\/developer.android.com\/about\/dashboards\/index.html\">Android Dashboard<\/a>\u306b\u3088\u308b\u3068\u3001\u3053\u306e\u8106\u5f31\u6027\u306e\u5f71\u97ff\u3092\u53d7\u3051\u305f\u306e\u306f2014\u5e741\u6708\u306e\u6700\u521d\u306e\u767a\u899a\u5f53\u6642\u3067Android\u4eba\u53e3\u306e\u7d0489.4%\u30012015\u5e743\u6708\u73fe\u5728\u3067\u7d0449.5%\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8106\u5f31\u6027\u60aa\u7528\u306b\u306f\u30c7\u30d0\u30a4\u30b9\u306eroot\u5316\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u304c\u3001root\u5316\u3055\u308c\u305f\u30c7\u30d0\u30a4\u30b9\u306f\u3088\u308a\u5371\u967a\u3067\u3059\u3002<\/p>\n<h4><strong>\u4e00\u90e8\u306eAndroid 4.3\u306b\u8106\u5f31\u6027<\/strong><\/h4>\n<p>\u4e00\u90e8\u306e\u643a\u5e2f\u30d9\u30f3\u30c0\u30fc\u306eAndroid 4.3\u306f\u3001\u3053\u306e\u8106\u5f31\u6027\u3092\u542b\u3093\u3067\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>AOSP web\u30b5\u30a4\u30c8\u306b\u516c\u958b\u3055\u308c\u305f\u30bd\u30fc\u30b9 \u30b3\u30fc\u30c9\u306b\u3088\u308b\u3068\u3001Android 4.3_r0.9\u3067\u3001\u300cTime to Check\u300d\u3068\u300cTime to Use\u300d\u306e\u9593\u3067\u691c\u8a3c\u3055\u308c\u308bAndroid M anifest\u306e\u30cf\u30c3\u30b7\u30e5 \u30c1\u30a7\u30c3\u30af\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3068\u3053\u308d\u304c\u3001\u4e00\u90e8\u306e\u643a\u5e2f\u30d9\u30f3\u30c0\u30fc\u306eAndroid 4.3\u306b\u306f\u3053\u306e\u30c1\u30a7\u30c3\u30af\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u305f\u3068\u3048\u3070\u3001Android 4.3 (\u30d3\u30eb\u30c9 \u30d0\u30fc\u30b8\u30e7\u30f3JSS15J.I337UCUEMK2\u30012013\u5e7411\u670816\u65e5\u4f5c\u6210)\u642d\u8f09\u306eSamsung Galaxy S4 Android\u643a\u5e2f\u3001\u304a\u3088\u3073Amazon Fire OS version 13.3.2.5\u306b\u304a\u3044\u3066\u3053\u306e\u8106\u5f31\u6027\u3092\u30c6\u30b9\u30c8\u3057\u691c\u51fa\u3057\u3066\u3044\u307e\u3059\u3002Samsung\u3001Amazon\u4e21\u793e\u3068\u3082\u3001 \u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u5831\u544a\u3092\u53d7\u3051\u53d6\u3063\u305f\u5f8c\u3001\u5f71\u97ff\u306e\u3042\u3063\u305f\u30c7\u30d0\u30a4\u30b9\u306e\u30d1\u30c3\u30c1\u3092\u30ea\u30ea\u30fc\u30b9\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3059\u3079\u3066\u306eAndroid\u30c7\u30d0\u30a4\u30b9 \u30d9\u30f3\u30c0\u30fc\u306b\u7f6e\u304b\u308c\u307e\u3057\u3066\u306f\u3001Android 4.3\u642d\u8f09\u30c7\u30d0\u30a4\u30b9\u3092\u542b\u3081\u305f\u5168\u30c7\u30d0\u30a4\u30b9\u3067\u3053\u306e\u8106\u5f31\u6027\u304c\u306a\u3044\u304b\u691c\u8a3c\u3059\u308b\u3088\u3046\u304a\u9858\u3044\u3057\u307e\u3059\u3002<\/p>\n<p>Android\u30d0\u30fc\u30b8\u30e7\u30f34.4\u4ee5\u964d\u3067\u306f\u3053\u306e\u8106\u5f31\u6027\u306f\u4fee\u6b63\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3><strong>\u5bfe\u7b56<\/strong><\/h3>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u3001\u8106\u5f31\u6027\u30b9\u30ad\u30e3\u30ca\u30fc \u30a2\u30d7\u30ea\u3092<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.paloaltonetworks.ctd.ihscanner\">Google Play Store<\/a>\u3067\u516c\u958b\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001\u3053\u306e\u8106\u5f31\u6027\u30b9\u30ad\u30e3\u30ca\u30fc \u30a2\u30d7\u30ea\u3067 \u300cInstaller Hijacking\u300d\u8106\u5f31\u6027\u306e\u5b58\u5728\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3059\u308b\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb \u30d3\u30c7\u30aa\u3092\u516c\u958b\u3057\u3066\u3044\u307e\u3059\u3002<a href=\"https:\/\/www.youtube.com\/watch?v=AgPEoYdHE34&amp;amp;amp;feature=youtu.be\" rel=\"wpdevart_lightbox_video\">\u3053\u3053\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044<\/a>\u3002<\/p>\n<p>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7814\u7a76\u8005\u3084\u4ed6\u306e\u30d9\u30f3\u30c0\u30fc\u306b\u4fbf\u5b9c\u3092\u56f3\u308b\u305f\u3081\u3001\u8106\u5f31\u6027\u30b9\u30ad\u30e3\u30ca\u30fc \u30a2\u30d7\u30ea\u306e\u30bd\u30fc\u30b9\u3092Github\u306e<a href=\"https:\/\/github.com\/PaloAltoNetworks-BD\/InstallerHijackingVulnerabilityScanner\">https:\/\/github.com\/PaloAltoNetworks-BD\/InstallerHijackingVulnerabilityScanner<\/a>\u3067\u516c\u958b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8106\u5f31\u6027\u30ea\u30b9\u30af\u306b\u61f8\u5ff5\u3092\u6301\u3064\u4f01\u696d\u306f\u4ee5\u4e0b\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u53d6\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u8106\u5f31\u6027\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u30c7\u30d0\u30a4\u30b9\u306b\u306f\u3001Google Play\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u307f\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3053\u3068\u3002\u3053\u308c\u3089\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u4fdd\u8b77\u3055\u308c\u3066\u3044\u308b\u30b9\u30da\u30fc\u30b9\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u308b\u305f\u3081\u3001\u653b\u6483\u8005\u306b\u3088\u308a\u66f8\u304d\u63db\u3048\u3089\u308c\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<li>Android 4.3_r0.9\u4ee5\u964d\u306e\u30e2\u30d0\u30a4\u30eb \u30c7\u30d0\u30a4\u30b9\u3092\u5c55\u958b\u3059\u308b\u3053\u3068\u3002\u305f\u3060\u3057\u3001\u4e00\u90e8\u306b\u306f\u8106\u5f31\u306aAndroid 4.3\u30c7\u30d0\u30a4\u30b9\u3082\u3042\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<li>\u30a2\u30d7\u30ea\u306blogcat\u3078\u306e\u30a2\u30af\u30bb\u30b9\u8a31\u53ef\u3092\u4e0e\u3048\u306a\u3044\u3053\u3068\u3002Logcat\u306f\u30b7\u30b9\u30c6\u30e0 \u30ed\u30b0\u3067\u3001\u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u3068\u60aa\u7528\u3092\u5358\u7d14\u5316\u3001\u81ea\u52d5\u5316\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002Android 4.1\u4ee5\u964d\u3067\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u30a2\u30d7\u30ea\u306b\u3088\u308b\u30b7\u30b9\u30c6\u30e0\u304a\u3088\u3073\u305d\u306e\u4ed6\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u305f\u30a2\u30d7\u30ea\u306elogcat\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u7981\u6b62\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u3067\u3082\u3001\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u305f\u30a2\u30d7\u30ea\u306f\u3001\uff52oot\u5316\u3055\u308c\u305fAndroid 4.1\u4ee5\u964d\u306e\u30e2\u30d0\u30a4\u30eb \u30c7\u30d0\u30a4\u30b9\u4e0a\u306e\u4ed6\u306e\u30a2\u30d7\u30ea\u306elogcat\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<li>\u30e6\u30fc\u30b6\u30fc\u306broot\u5316\u3055\u308c\u305f\u30c7\u30d0\u30a4\u30b9\u306e\u4f7f\u7528\u3092\u8a31\u53ef\u3057\u306a\u3044\u3053\u3068\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u8106\u5f31\u6027\u30ea\u30b9\u30af\u306b\u61f8\u5ff5\u3092\u6301\u3064\u30a2\u30d7\u30ea\u958b\u767a\u8005\u306f\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305fAPK\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u8b77\u3055\u308c\u3066\u3044\u308b\u30b9\u30c8\u30ec\u30fc\u30b8 \u30b9\u30da\u30fc\u30b9\u306e\u307f\u306b\u4fdd\u5b58\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3><strong>\u30d9\u30f3\u30c0\u30fc \u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af<\/strong><\/h3>\n<h4><strong>Google\u304b\u3089:<\/strong><\/h4>\n<p><em>\u300cAndroid Open Source Project<\/em> <em>\u306b\u306fAndroid 4.3\u4ee5\u964d\u306b\u5bfe\u3059\u308b\u3053\u306e\u554f\u984c\u306e\u30d1\u30c3\u30c1\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/em> <em>\u30d1\u30c3\u30c1\u306f\u3053\u3053\u3067\u5165\u624b\u3067\u304d\u307e\u3059\u3002<\/em><a href=\"https:\/\/android.googlesource.com\/platform\/packages\/apps\/PackageInstaller\/+\/2b3202c3ff18469b294629bf1416118f12492173\"><em>https:\/\/android.googlesource.com\/platform\/packages\/apps\/PackageInstaller\/+\/2b3202c3ff18469b294629bf1416118f12492173<\/em><\/a><\/p>\n<p><em>Android Security Team\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc<\/em> <em>\u30c7\u30d0\u30a4\u30b9\u4e0a\u3067\u3053\u306e\u8106\u5f31\u6027\u3092\u60aa\u7528\u3059\u308b\u8a66\u307f\u306f\u4e00\u5207\u78ba\u8a8d\u3057\u3066\u3044\u307e\u305b\u3093\u300d<\/em><\/p>\n<h4><strong>Amazon\u304b\u3089:<\/strong><\/h4>\n<p>\u300c<em>\u304a\u5ba2\u69d8\u306b\u306fFire\u30c7\u30d0\u30a4\u30b9\u3067\u81ea\u52d5\u66f4\u65b0\u3055\u308c\u308b\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306eAmazon AppStore\u3078\u306e\u79fb\u884c\u3092\u304a\u9858\u3044\u3057\u307e\u3059\u3002<\/em> <em>\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3Android\u30c7\u30d0\u30a4\u30b9\u306f<\/em><a href=\"https:\/\/blog.paloaltonetworks.com\/2015\/03\/android-installer-hijacking-vulnerability-could-expose-android-users-to-malware\/www.amazon.com\/getappstore\"><em>www.amazon.com\/getappstore<\/em><\/a><em>\u3067\u66f4\u65b0\u3067\u304d\u307e\u3059<\/em>\u300d<\/p>\n<h3><strong>\u958b\u793a\u306e\u5c65\u6b74<\/strong><\/h3>\n<ul>\n<li>2014\u5e741\u6708\uff1a \u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u304c\u521d\u3081\u3066\u767a\u898b<\/li>\n<li>2014\u5e742\u6708\uff1a Google Android Security Team\u3078\u8106\u5f31\u6027\u3092\u5831\u544a<\/li>\n<li>2014\u5e743\u6708\uff1a Samsung\u3078\u8106\u5f31\u6027\u3092\u5831\u544a<\/li>\n<li>2014\u5e749\u6708\uff1a Amazon\u3078\u8106\u5f31\u6027\u3092\u5831\u544a<\/li>\n<li>2015\u5e743\u6708\uff1a \u4e00\u822c\u516c\u958b<\/li>\n<\/ul>\n<h3><strong>\u8b1d\u8f9e<\/strong><\/h3>\n<p>\u8106\u5f31\u6027\u306e\u78ba\u8a8d\u3001\u304a\u3088\u3073\u30d9\u30f3\u30c0\u30fc\u3078\u306e\u901a\u77e5\u306b\u304a\u3044\u3066\u60dc\u3057\u307f\u306a\u3044\u5354\u529b\u3092\u3057\u3066\u304f\u308c\u305f\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306eRyan Olson\u3001Huagang Xie\u3001Claud Xiao\u3001Colt Blackmore\u3001\u304a\u3088\u3073Taylor Ettema\u306b\u611f\u8b1d\u3057\u307e\u3059\u3002\u8106\u5f31\u6027\u306e\u516c\u958b\u3068\u30b9\u30ad\u30e3\u30ca\u30fc \u30a2\u30d7\u30ea\u306e\u69cb\u7bc9\u3067\u529b\u3092\u767a\u63ee\u3057\u305f\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306eScott Simkin\u3001JL Watkins\u3001Baoyue Hu\u3001\u304a\u3088\u3073Erik Jacobsen\u306b\u3082\u611f\u8b1d\u3057\u307e\u3059\u3002 \u307e\u305f\u3001\u3053\u306e\u8106\u5f31\u6027\u306e\u78ba\u8a8d\u3068\u30d1\u30c3\u30c1\u4f5c\u6210\u3067\u5f53\u793e\u306b\u5354\u529b\u3044\u305f\u3060\u3044\u305fSamsung Knox team\u3001Google Android Security team\u3001\u304a\u3088\u3073Amazon Web Services &amp; Lab126\u306b\u656c\u610f\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 \u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306f\u3001Google\u306eAndroid OS\u306e\u8106\u5f31\u6027\u300cAndroid Installer 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