Appshark is a static taint analysis platform to scan vulnerabilities in an Android app.
Prerequisites
Appshark requires a specific version of JDK — JDK 11. After testing, it does not work on other LTS versions, JDK 8 and JDK 16, due to the dependency compatibility issue.
Building/Compiling AppShark
We assume that you are working in the root directory of the project repo. You can build the whole project with the gradle tool.
$ ./gradlew build -x test After executing the above command, you will see an artifact file AppShark-0.1.1-all.jar in the directory build/libs.
Running AppShark
Like the previous step, we assume that you are still in the root folder of the project. You can run the tool with
$ java -jar build/libs/AppShark-0.1.1-all.jar config/config.json5The config.json5 has the following configuration contents.
{
"apkPath": "/Users/apks/app1.apk",
"out": "out",
"rules": "unZipSlip.json",
"maxPointerAnalyzeTime": 600
} Each JSON field is explained below.
- apkPath: the path of the apk file to analyze
- out: the path of the output directory
- rules: the path(s) of the rule file(s), can be more than 1 rules
- maxPointerAnalyzeTime: the timeout duration in seconds set for the analysis started from an entry point
- debugRule: specify the rule name that enables logging for debugging
If you provide a configuration JSON file which sets the output path as out in the project root directory, you will find the result file out/results.json after running the analysis.
Interpreting the Results
Below is an example of the results.json.
{
"AppInfo": {
"AppName": "test",
"PackageName": "net.bytedance.security.app",
"min_sdk": 17,
"target_sdk": 28,
"versionCode": 1000,
"versionName": "1.0.0"
},
"SecurityInfo": {
"FileRisk": {
"unZipSlip": {
"category": "FileRisk",
"detail": "",
"model": "2",
"name": "unZipSlip",
"possibility": "4",
"vulners": [
{
"details": {
"position": "",
"Sink": "->$r31",
"entryMethod": "",
"Source": "->$r3",
"url": "/Volumes/dev/zijie/appshark-opensource/out/vuln/1-unZipSlip.html",
"target": [
"->$r3",
"pf{obj{:35=>java.lang.StringBuilder}(unknown)->@data}",
"->$r11",
"->$r31"
]
},
"hash": "ec57a2a3190677ffe78a0c8aaf58ba5aee4d 2247",
"possibility": "4"
},
{
"details": {
"position": "",
"Sink": "->$r34",
"entryMethod": "",
"Source": "->$r3",
"url": "/Volumes/dev/zijie/appshark-opensource/out/vuln/2-unZipSlip.html",
"target": [
"->$r3",
"pf{obj{:33=>java.lang.StringBuilder}(unknown)->@data}",
"->$r14",
"->$r34"
]
},
"hash": "26c6d6ee704c59949cfef78350a1d9aef04c29ad",
"possibility": "4"
}
],
"wiki": "",
"deobfApk": "/Volumes/dev/zijie/appshark-opensource/app.apk"
}
}
},
"DeepLinkInfo": {
},
"HTTP_API": [
],
"JsBridgeInfo": [
],
"BasicInfo": {
"ComponentsInfo": {
},
"JSNativeInterface": [
]
},
"UsePermissions": [
],
"DefinePermis sions": {
},
"Profile": "/Volumes/dev/zijie/appshark-opensource/out/vuln/3-profiler.json"
} 
