{"id":104043,"date":"2022-05-15T09:36:47","date_gmt":"2022-05-15T07:36:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov"},"modified":"2022-05-15T09:36:47","modified_gmt":"2022-05-15T07:36:48","slug":"uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Ranjivost u Pythonu koja omogu\u0107ava izvr\u0161avanje sistemskih komandi iz izoliranih skripti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Objavljen je metod za zaobila\u017eenje sustava izoliranog izvr\u0161avanja koda na Pythonu, koji se temelji na ve\u0107 dugo poznatoj gre\u0161ci otkrivenoj u Pythonu 2.7, identificiranoj 2012. godine i koja do danas nije ispravljena u Pythonu 3. Gre\u0161ka omogu\u0107uje da se uz pomo\u0107 posebno strukturiranog koda na Pythonu inicira pristup ve\u0107 oslobo\u0111enoj memoriji (Use-After-Free) u CPythonu. Izvorno je pretpostavljeno da gre\u0161ka ne predstavlja sigurnosnu prijetnju i da mo\u017ee dovesti do prekida izvo\u0111enja skripte samo u vrlo rijetkim, obi\u010dno umjetno stvorenim, slu\u010dajevima. <\/p>\n

Sigurnosni istra\u017eiva\u010d pod pseudonimom kn32 zainteresirao se za problem i uspio pripremiti funkcionalni exploit koji omogu\u0107uje pozivanje bilo koje sistemske komande bez izravnog pristupa metodama poput os.system. Exploit je razvijen na \u010distom Python jeziku i radi bez uvoza vanjskih biblioteka i bez instalacije obrade \u201ecode.__new__\u201c. Koristi se samo \u201ebuiltin.__id__\u201c, koji obi\u010dno nije zabranjen. Sa prakti\u010dne strane, predlo\u017eeni kod mo\u017ee se primijeniti zaobila\u017eenju mehanizama izolacije u raznim servisima i okru\u017eenjima (na primjer, u obrazovnim okru\u017eenjima, online su\u010deljima, ugra\u0111enim obradnicima itd.) koji omogu\u0107uju izvr\u0161avanje koda na Python jeziku, ali ograni\u010davaju dostupne pozive i ne dopu\u0161taju pristup metodama poput os.system. <\/p>\n

Predlo\u017eeni kod predstavlja analogni poziv os.system, koji djeluje iskori\u0161tavaju\u0107i ranjivost u CPython-u. Exploit radi sa svim verzijama Python 3 na sustavima s x86-64 arhitekturom i pokazuje stabilno funkcioniranje na Ubuntu 22.04, \u010dak i pri uklju\u010divanju za\u0161titnih na\u010dina rada kao \u0161to su PIE, RELRO i CET. Operacija se svodi na dobivanje informacija iz Python koda o adresi jedne od funkcija u izvr\u0161nom kodu CPython-a. Na temelju te adrese izra\u010dunava se osnovna adresa CPython-a u memoriji i adresa funkcije system() u u\u010ditanom primjerku libc. Na kraju se inicira izravni prijelaz na odre\u0111enu adresu system s zamjenom pokaziva\u010da prvog argumenta s nizom \"\/bin\/sh\".

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

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043c\u0435\u0442\u043e\u0434 \u043e\u0431\u0445\u043e\u0434\u0430 \u0441\u0438\u0441\u0442\u0435\u043c \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0434\u0430\u0432\u043d\u043e \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438, \u043f\u043e\u044f\u0432\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u0432 Python 2.7, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 2012 \u0433\u043e\u0434\u0443 \u0438 \u0434\u043e \u0441\u0438\u0445 \u043f\u043e\u0440 \u043d\u0435 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":104044,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104043","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Ranjivost u Pythonu koja omogu\u0107uje izvr\u0161avanje sistemskih komandi iz izoliranih skripti | ProHoster","description":"Objavljen je metod za zaobila\u017eenje sustava izoliranog izvr\u0161avanja koda na Pythonu, koji se temelji na ve\u0107 dugo poznatoj gre\u0161ci otkrivenoj u Pythonu 2.7, identificiranoj 2012. godine i koja do danas nije 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