A Study of Android Application Security.pdf

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1、fPvpqbjp^kaFkqbokbqfFkco^pqor`qrobPb`rofqvKbqtloh^kaPb`rofqvObpb^o`e@bkqboAbm^oqjbkqlc@ljmrqboP`fbk`b^kaBkdfkbbofkdMbkkpvis^kf^Pq^qbRkfsbopfqv)RkfsbopfqvM^ohM>AStudyofAndroidApplicationSecurityWilliamEnck,DamienOcteau,PatrickMcDaniel,andSwaratChaudhuriUSENIXSecurityS

2、ymposiumAugust2011SystemsandInternetInfrastructureSecurityLaboratory(SIIS)Page1NewDominantPlayerSystemsandInternetInfrastructureSecurityLaboratory(SIIS)Page2NewDominantPlayer•Nobodyislookingatalltheapps(250Kandgrowing)•Whatwouldyoulookforifyoudid?SystemsandInternetIn

3、frastructureSecurityLaboratory(SIIS)Page2StudyingApplications•Goal:StudyabreadthofsecuritypropertiesinalargesetofpopularAndroidsmartphoneapplications.•Howdoyougettheapplicationsandsourcecode?‣Howtoretrieveapplicationpackages(.apkfiles)?‣Howtoretrievingapplicationsourc

4、ecode?•Howdoyougoaboutstudyingthesourcecode?‣Whatdoyoulookfor?‣Howdoyoulookforit?‣Howdoyouknowwhat’sactuallythere?SystemsandInternetInfrastructureSecurityLaboratory(SIIS)Page3DalvikEXecutables•AndroidapplicationswrittenJava,compiledtoJavabytecode,andtranslatedintoDEX

5、bytecode(DalvikVM)JavadxCompilerClass1.class.dexfileConstantPoolHeaderClassInfoDataConstantPoolJavaSourceCodeClass1definition(.javafiles)ClassN.classConstantPoolClassNdefinitionClassInfoDataData•WewanttoworkwithJava,notDEXbytecode‣Therearealotofexistingprogramanalysistoo

6、lsforJava‣Wewanttoseewhatthedeveloperwasdoing(i.e.,confirmation)•Non-trivialtoretargetbacktoJava:‣registervs.stackarchitecture,constantpools,ambiguousscalartypes,nullreferences,etc.SystemsandInternetInfrastructureSecurityLaboratory(SIIS)Page4GettingbacktotheSourceReta

7、rgetingProcess•ThededdecompilerCFGConstruction(1)DEXParsingTypeInferenceProcessing‣ReferstoboththeentireprocessMissingTypeInferenceConstantandthe.dex⇒.classretargetingtoolIdentification(2)Java.classConstantPoolConversionConversionConstantPoolTranslation‣Multi-stagepro

8、cesswithmanyMethodCodeRetargetingBytecodesub-stagesReorganization(3)Java.classOptimizationInstructionSet‣http://siis.cse.psu.edu/de