{"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\/cs\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Zranitelnost v Pythonu, kter\u00e1 umo\u017e\u0148uje spou\u0161t\u011bt syst\u00e9mov\u00e9 p\u0159\u00edkazy z izolovan\u00fdch skript\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byl zve\u0159ejn\u011bn metod obch\u00e1zen\u00ed syst\u00e9m\u016f izolovan\u00e9ho spou\u0161t\u011bn\u00ed k\u00f3du v jazyce Python, zalo\u017een\u00fd na vyu\u017eit\u00ed dlouho zn\u00e1m\u00e9 chyby, kter\u00e1 se objevila ve verzi Python 2.7, odhalena v roce 2012 a dodnes neopraven\u00e1 v Python 3. Tato chyba umo\u017e\u0148uje pomoc\u00ed speci\u00e1ln\u011b sestaven\u00e9ho k\u00f3du v jazyce Python iniciovat p\u0159\u00edstup k ji\u017e uvoln\u011bn\u00e9 pam\u011bti (Use-After-Free) v CPython. P\u016fvodn\u011b se p\u0159edpokl\u00e1dalo, \u017ee chyba nep\u0159edstavuje bezpe\u010dnostn\u00ed hrozbu a \u017ee pouze ve velmi vz\u00e1cn\u00fdch p\u0159\u00edpadech, obvykle um\u011ble vytvo\u0159en\u00fdch, m\u016f\u017ee v\u00e9st k ne\u010dekan\u00e9mu ukon\u010den\u00ed skriptu. <\/p>\n

Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edk pod pseudonymem kn32 se zaj\u00edmal o probl\u00e9m a dok\u00e1zal p\u0159ipravit funk\u010dn\u00ed exploit, kter\u00fd umo\u017e\u0148uje vyvolat jak\u00fdkoli syst\u00e9mov\u00fd p\u0159\u00edkaz, ani\u017e by m\u011bl p\u0159\u00edm\u00fd p\u0159\u00edstup k metod\u00e1m jako je os.system. Exploit je implementov\u00e1n ve \u010d pure Pythonu a funguje bez importov\u00e1n\u00ed extern\u00edch knihoven a bez instalace zpracovatele «code.__new__». Pou\u017e\u00edv\u00e1ny jsou pouze hooky «builtin.__id__», kter\u00e9 obvykle nejsou zak\u00e1z\u00e1ny. Z praktick\u00e9ho hlediska m\u016f\u017ee b\u00fdt navr\u017een\u00fd k\u00f3d pou\u017eit k obch\u00e1zen\u00ed izola\u010dn\u00edch mechanism\u016f v r\u016fzn\u00fdch slu\u017eb\u00e1ch a prost\u0159ed\u00edch (nap\u0159\u00edklad v tr\u00e9ninkov\u00fdch prost\u0159ed\u00edch, online shell-\u00edch, vestav\u011bn\u00fdch zpracovatel\u00edch atd.), kter\u00e9 umo\u017e\u0148uj\u00ed vykon\u00e1n\u00ed k\u00f3du v Pythonu, ale omezuj\u00ed dostupn\u00e9 vol\u00e1n\u00ed a neumo\u017e\u0148uj\u00ed p\u0159\u00edstup k metod\u00e1m jako je os.system. <\/p>\n

Navr\u017een\u00fd k\u00f3d p\u0159edstavuje ekvivalent vol\u00e1n\u00ed os.system, kter\u00fd pracuje na z\u00e1klad\u011b zneu\u017eit\u00ed zranitelnosti v CPython. Exploit funguje se v\u0161emi verzemi Pythonu 3 na syst\u00e9mech s architekturou x86-64 a ukazuje stabiln\u00ed funkci na Ubuntu 22.04, i kdy\u017e jsou zapnuty ochrann\u00e9 re\u017eimy PIE, RELRO a CET. Pr\u00e1ce spo\u010d\u00edv\u00e1 ve z\u00edsk\u00e1n\u00ed informac\u00ed z k\u00f3du v Pythonu o adrese jedn\u00e9 z funkc\u00ed v provediteln\u00e9m k\u00f3du CPython. Na z\u00e1klad\u011b t\u00e9to adresy se vypo\u010d\u00edt\u00e1 z\u00e1kladn\u00ed adresa CPython v pam\u011bti a adresa funkce system() ve na\u010dten\u00e9m instance libc. Na z\u00e1v\u011br je iniciov\u00e1n p\u0159\u00edm\u00fd p\u0159echod na ur\u010denou adresu system s nahrazen\u00edm ukazatele prvn\u00edho argumentu \u0159et\u011bzcem «\\\/bin\\\/sh».

\"Zranitelnost<\/center>
\n
Zdroj: 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 \u0432 Python 3. \u041e\u0448\u0438\u0431\u043a\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435 \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (Use-After-Free) \u0432 \u0421Python. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u0430\u0433\u0430\u043b\u043e\u0441\u044c, \u0447\u0442\u043e […]<\/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\udd47Zranitelnost v Pythonu umo\u017e\u0148uj\u00edc\u00ed spou\u0161t\u011bt syst\u00e9mov\u00e9 p\u0159\u00edkazy z izolovan\u00fdch skript\u016f | ProHoster","description":"Byl zve\u0159ejn\u011bn metod obch\u00e1zen\u00ed syst\u00e9m\u016f izolovan\u00e9ho spou\u0161t\u011bn\u00ed k\u00f3du v jazyce Python, zalo\u017een\u00fd na vyu\u017eit\u00ed dlouho zn\u00e1m\u00e9 chyby, kter\u00e1 se objevila ve verzi Python 2.7, odhalena v roce 2012 a dodnes neopraven\u00e1.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Python, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b 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