{"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\/cs\/blog\/news\/loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya","title":{"rendered":"LoadLibrary, vrstva pro na\u010d\u00edt\u00e1n\u00ed Windows DLL do aplikac\u00ed Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tavis Ormandy (Tavis Ormandy<\/a><\/noindex>), bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edk z Google, rozv\u00edj\u00ed projekt LoadLibrary<\/a><\/noindex>, zam\u011b\u0159en\u00fd na portov\u00e1n\u00ed knihoven DLL navr\u017een\u00fdch pro Windows pro pou\u017eit\u00ed v aplikac\u00edch pro Linux. Projekt poskytuje p\u0159ekryvnou knihovnu, pomoc\u00ed kter\u00e9 je mo\u017en\u00e9 na\u010d\u00edst DLL soubor ve form\u00e1tu PE\/COFF a vyvolat v n\u011bm definovan\u00e9 funkce. Na\u010d\u00edtac\u00ed modul PE\/COFF je zalo\u017een na k\u00f3du ndiswrapper<\/a><\/noindex>. K\u00f3d projektu distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed GPLv2.<\/p>\n

LoadLibrary se uj\u00edm\u00e1 funkc\u00ed na\u010d\u00edt\u00e1n\u00ed knihovny do pam\u011bti a importu dostupn\u00fdch symbol\u016f, poskytuj\u00edc\u00ed aplikaci pro Linux API ve stylu dlopen. P\u0159ipojen\u00fd k\u00f3d lze ladit pomoc\u00ed gdb, ASAN a Valgrind. Je mo\u017en\u00e9 prov\u00e1d\u011bt \u00fapravy spustiteln\u00e9ho k\u00f3du za b\u011bhu prost\u0159ednictv\u00edm p\u0159ipojov\u00e1n\u00ed h\u00e1k\u016f a aplikace patch\u016f (runtime patching). Podpora pro zpracov\u00e1n\u00ed a tvrd\u00e9 ukon\u010den\u00ed (unwinding) v\u00fdjimek pro C++.<\/p>\n

C\u00edlem projektu je organizov\u00e1n\u00ed \u0161k\u00e1lovateln\u00e9ho a efektivn\u00edho distribuovan\u00e9ho fuzzing testov\u00e1n\u00ed knihoven DLL v prost\u0159ed\u00ed Linuxu. V syst\u00e9mu Windows realizace fuzzing a coverage testov\u00e1n\u00ed ned\u00e1v\u00e1 po\u017eadovanou efektivitu a \u010dasto vy\u017eaduje spu\u0161t\u011bn\u00ed samostatn\u00e9 virtualizovan\u00e9 instance Windows, zejm\u00e9na p\u0159i anal\u00fdze komplikovan\u00fdch produkt\u016f, jako je antivirov\u00fd software, kter\u00e9 zasahuj\u00ed na \u00farovni j\u00e1dra a u\u017eivatelsk\u00e9ho prostoru. Pomoc\u00ed LoadLibrary se v\u011bdci z Google zab\u00fdvaj\u00ed vyhled\u00e1v\u00e1n\u00edm zranitelnost\u00ed ve video kodec\u00edch, antivirov\u00fdch skenerech, knihovn\u00e1ch pro dekompresi dat, dekod\u00e9rech obraz\u016f atd. <\/p>\n

Nap\u0159\u00edklad pomoc\u00ed LoadLibrary se poda\u0159ilo portovat antivirov\u00fd motor Windows Defender pro spu\u0161t\u011bn\u00ed v Linuxu. Anal\u00fdza mpengine.dll, co\u017e je z\u00e1klad Windows Defender, umo\u017enila prov\u011b\u0159it velk\u00e9 mno\u017estv\u00ed komplikovan\u00fdch zpracovatel\u016f r\u016fzn\u00fdch form\u00e1t\u016f, emul\u00e1tor\u016f FS a interpreter\u016f jazyk\u016f, kter\u00e9 potenci\u00e1ln\u011b poskytuj\u00ed vektory pro mo\u017en\u00fdch<\/a><\/noindex> \u00fatok\u016f<\/a><\/noindex>.<\/p>\n

LoadLibrary byl tak\u00e9 pou\u017eit p\u0159i odhalen\u00ed vzd\u00e1len\u00e9 zranitelnosti<\/a><\/noindex> v antivirov\u00e9m bal\u00ed\u010dku Avast. P\u0159i zkoum\u00e1n\u00ed DLL tohoto antiviru bylo zji\u0161t\u011bno, \u017ee kl\u00ed\u010dov\u00fd privilegovan\u00fd proces skenov\u00e1n\u00ed zahrnuje plnohodnotn\u00fd JavaScript interpret, kter\u00fd se pou\u017e\u00edv\u00e1 k emulaci prov\u00e1d\u011bn\u00ed extern\u00edho JavaScript k\u00f3du. Tento proces nen\u00ed izolov\u00e1n v sandboxov\u00e9m prost\u0159ed\u00ed, nesni\u017euje privilegium a prov\u00e1d\u00ed anal\u00fdzu neov\u011b\u0159en\u00fdch extern\u00edch dat z FS a zachycen\u00e9ho s\u00ed\u0165ov\u00e9ho provozu. Jak\u00e1koli zranitelnost v tomto slo\u017eit\u00e9m a nezabezpe\u010den\u00e9m procesu m\u016f\u017ee potenci\u00e1ln\u011b v\u00e9st k vzd\u00e1len\u00e9mu kompromitov\u00e1n\u00ed cel\u00e9ho syst\u00e9mu, na z\u00e1klad\u011b LoadLibrary byl vyvinut speci\u00e1ln\u00ed wrapper. avscript<\/a><\/noindex> pro anal\u00fdzu zranitelnost\u00ed v antivirov\u00e9m skeneru Avast v prost\u0159ed\u00ed zalo\u017een\u00e9m na Linuxu.<\/p>\n

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

Zdroj: 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. […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-74109","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47LoadLibrary, vrstva pro na\u010d\u00edt\u00e1n\u00ed Windows DLL do Linuxov\u00fdch aplikac\u00ed | ProHoster","description":"Tavis Ormandy, v\u00fdzkumn\u00edk bezpe\u010dnosti z Google, rozv\u00edj\u00ed 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