{"id":74109,"date":"2020-03-14T08:42:14","date_gmt":"2020-03-14T05:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya"},"modified":"2020-03-14T08:42:14","modified_gmt":"2020-03-14T05:42:14","slug":"loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya","title":{"rendered":"LoadLibrary, et lag til at indl\u00e6se Windows DLL i Linux-applikationer","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tavis Ormandy (Tavis Ormandy<\/a><\/noindex>), sikkerhedsforsker fra Google, udvikler et projekt LoadLibrary<\/a><\/noindex>, der sigter mod at porte DLL-biblioteker opbygget til Windows til brug i applikationer til Linux. Projektet leverer et lag-bibliotek, som g\u00f8r det muligt at indl\u00e6se en DLL-fil i PE\/COFF-format og kalde definerede funktioner i den. PE\/COFF-laderen er baseret p\u00e5 kode ndiswrapper<\/a><\/noindex>. Projektkoden distribueres<\/a><\/noindex> er under GPLv2-licensen.<\/p>\n

LoadLibrary h\u00e5ndterer opgaverne med at indl\u00e6se biblioteker i hukommelsen og importere eksisterende symboler, hvilket giver Linux-applikationen et API i dlopen-stil. Den underst\u00f8ttede kode kan fejls\u00f8ges ved hj\u00e6lp af gdb, ASAN og Valgrind. Der er mulighed for at justere den eksekverbare kode under k\u00f8rslen ved hj\u00e6lp af tilkobling af hooks og patching (runtime patching). Undtagelser for C++ underst\u00f8ttes.<\/p>\n

Projektets m\u00e5l er at organisere skalerbar og effektiv distribueret fuzzing-testning af DLL-biblioteker i et Linux-baseret milj\u00f8. I Windows g\u00f8r fuzzing- og coverage-testning det sv\u00e6rt at opn\u00e5 den n\u00f8dvendige effektivitet og kr\u00e6ver ofte, at der k\u00f8res en s\u00e6rskilt virtualiseret Windows-forekomst, is\u00e6r n\u00e5r man fors\u00f8ger at analysere komplekse produkter som antivirussoftware, der d\u00e6kker funktioner p\u00e5 kernel- og brugerrum-niveau. Ved hj\u00e6lp af LoadLibrary s\u00f8ger forskere fra Google efter s\u00e5rbarheder i videokodeker, antivirus-scannere, dataudpakningsbiblioteker, billeddecoders osv. <\/p>\n

For eksempel har LoadLibrary gjort det muligt at porte antivirusmotoren Windows Defender til at k\u00f8re p\u00e5 Linux. Unders\u00f8gelsen af mpengine.dll, som udg\u00f8r grundlaget for Windows Defender, har gjort det muligt at analysere et stort antal komplekse h\u00e5ndteringsenheder af forskellige formater, filsystememulatorer og sprogfortolkere, der potentielt giver vektorer for mulige<\/a><\/noindex> angreb<\/a><\/noindex>.<\/p>\n

LoadLibrary er ogs\u00e5 blevet brugt til at identificere fjernede s\u00e5rbarheder<\/a><\/noindex> i antiviruspakken Avast. Ved analyse af DLL fra denne antivirus blev det afsl\u00f8ret, at den centrale privilegerede scanningsproces omfatter en fuld JavaScript-fortolker, der bruges til at emulere udf\u00f8relsen af tredjeparts JavaScript-kode. Denne proces er ikke isoleret i et sandbox-milj\u00f8, opgiver ikke privilegier og analyserer up\u00e5lidelige eksterne data fra filsystemet og opsnappet netv\u00e6rkstrafik. Da enhver s\u00e5rbarhed i denne komplicerede og usikrede proces potentielt kan f\u00f8re til fjernkompromittering af hele systemet, blev der udviklet et s\u00e6rligt lag baseret p\u00e5 LoadLibrary. avscript<\/a><\/noindex> til analyse af s\u00e5rbarheder i antivirusprogrammet Avast i et Linux-baseret milj\u00f8.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0422\u044d\u0432\u0438\u0441 \u041e\u0440\u043c\u0430\u043d\u0434\u0438 (Tavis Ormandy), \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 Google, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442 \u043f\u0440\u043e\u0435\u043a\u0442 LoadLibrary, \u043d\u0430\u0446\u0435\u043b\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043f\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u043e\u0431\u0440\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f Windows DLL-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a \u0434\u043b\u044f \u0438\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445 \u0434\u043b\u044f Linux. \u041f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430-\u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0430, \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0442\u044c DLL-\u0444\u0430\u0439\u043b \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 PE\/COFF \u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0435 \u0432 \u043d\u0451\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438. \u0417\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a PE\/COFF \u043e\u0441\u043d\u043e\u0432\u0430\u043d \u043d\u0430 \u043a\u043e\u0434\u0435 ndiswrapper. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2. 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