{"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\/pl\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Luka w Pythonie, kt\u00f3ra pozwala na wywo\u0142ywanie polece\u0144 systemowych z izolowanych skrypt\u00f3w.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Opublikowano metod\u0119 omijania system\u00f3w izolowanego wykonania kodu w j\u0119zyku Python, opart\u0105 na wykorzystaniu dawno znanego b\u0142\u0119du, kt\u00f3ry pojawi\u0142 si\u0119 w Pythonie 2.7, zidentyfikowanego w 2012 roku i do tej pory niepoprawionego w Pythonie 3. B\u0142\u0105d ten pozwala, za pomoc\u0105 specjalnie skonstruowanego kodu w j\u0119zyku Python, zainicjowa\u0107 dost\u0119p do ju\u017c zwolnionej pami\u0119ci (Use-After-Free) w CPython. Pierwotnie s\u0105dzono, \u017ce b\u0142\u0105d nie stanowi zagro\u017cenia bezpiecze\u0144stwa i tylko w bardzo rzadkich przypadkach, zazwyczaj sztucznie stworzonych, mo\u017ce prowadzi\u0107 do awaryjnego zako\u0144czenia skryptu. <\/p>\n

Badacz bezpiecze\u0144stwa pos\u0142uguj\u0105cy si\u0119 pseudonimem kn32 zainteresowa\u0142 si\u0119 problemem i uda\u0142o mu si\u0119 przygotowa\u0107 dzia\u0142aj\u0105cy exploit, kt\u00f3ry pozwala na wywo\u0142anie dowolnego polecenia systemowego, nie maj\u0105c bezpo\u015bredniego dost\u0119pu do metod typu os.system. Exploit jest napisany w czystym j\u0119zyku Python i dzia\u0142a bez importowania zewn\u0119trznych bibliotek oraz instalowania obs\u0142ugi 'code.__new__'. Z hook\u00f3w u\u017cywany jest tylko 'builtin.__id__', kt\u00f3ry zazwyczaj nie jest zabroniony. Z praktycznego punktu widzenia proponowany kod mo\u017ce by\u0107 u\u017cywany do omijania mechanizm\u00f3w izolacji w r\u00f3\u017cnych us\u0142ugach i \u015brodowiskach (np. w \u015brodowiskach edukacyjnych, online-shelach, wbudowanych obs\u0142ugach itd.), kt\u00f3re dopuszczaj\u0105 wykonanie kodu w j\u0119zyku Python, ale ograniczaj\u0105 dost\u0119pne wywo\u0142ania i nie zezwalaj\u0105 na korzystanie z takich metod jak os.system. <\/p>\n

Proponowany kod jest analogiem wywo\u0142ania os.system, dzia\u0142aj\u0105cym przez wykorzystanie luki w CPython. Exploit dzia\u0142a ze wszystkimi wersjami Pythona 3 na systemach z architektur\u0105 x86-64 i wykazuje stabilne dzia\u0142anie w Ubuntu 22.04, nawet przy w\u0142\u0105czonych trybach ochrony PIE, RELRO i CET. Dzia\u0142anie polega na uzyskaniu z kodu w j\u0119zyku Python informacji o adresie jednej z funkcji w wykonywalnym kodzie CPython. Na podstawie tego adresu obliczany jest podstawowy adres CPython w pami\u0119ci oraz adres funkcji system() w za\u0142adowanym w pami\u0119ci przyk\u0142adzie libc. Na koniec nast\u0119puje bezpo\u015brednie przej\u015bcie do okre\u015blonego adresu system, podstawiaj\u0105c wska\u017anik pierwszego argumentu na string '\/bin\/sh'.

\"Luka<\/center>
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\u0179r\u00f3d\u0142o: 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\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\udd47Luka w Pythonie, kt\u00f3ra umo\u017cliwia wywo\u0142ywanie polece\u0144 systemowych z izolowanych skrypt\u00f3w | ProHoster","description":"Opublikowano metod\u0119 omijania system\u00f3w izolowanego wykonania kodu w j\u0119zyku Python, opart\u0105 na wykorzystaniu dawno znanego b\u0142\u0119du, kt\u00f3ry pojawi\u0142 si\u0119 w Pythonie 2.7, zidentyfikowanego w 2012 roku i do tej pory 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