{"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\/et\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Pythonis ilmnenud haavatavus, mis v\u00f5imaldab kutsuda s\u00fcsteemik\u00e4ske isolatsiooni all olevatest skriptidest","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avaldatud on meetod koodide isoleeritud k\u00e4itamise s\u00fcsteemide \u00fcmbersaatmiseks Pythonis, mis p\u00f5hineb juba pikka aega tuntud veal, mis tekkis Python 2.7-s, avastatud 2012. aastal ja siiani parandamata Python 3-s. Veat v\u00f5imaldab spetsiaalselt koostatud koodi abil esitada p\u00e4ringuid juba vabastatud m\u00e4llu (Use-After-Free) CPythonis. Alguses arvatati, et see viga ei kujuta endast turvariski ja v\u00f5ib p\u00f5hjustada skripti ootamatut l\u00f5petamist ainult v\u00e4ga harvadel juhtudel, mis on tavaliselt kunstlikult loodud. <\/p>\n

Turvauuringute spetsialist, kes kasutab h\u00fc\u00fcdnime kn32, on uurinud probleemi ja suutnud koostada t\u00f6\u00f6tava eksploidiga, mis v\u00f5imaldab k\u00e4ivitada mis tahes s\u00fcsteemi k\u00e4sku ilma otsese juurdep\u00e4\u00e4suta meetoditele nagu os.system. Eksploidi on kirjutatud puhtas Pythonis ja see t\u00f6\u00f6tab ilma v\u00e4liste raamatukogude impordita ning ilma 'code.__new__' t\u00f6\u00f6tleja installimiseta. Kasutatakse ainult 'builtin.__id__' hook'e, mis tavaliselt ei ole keelatud. Praktiliselt v\u00f5ib etten\u00e4htud koodi kasutada isolatsioonimehhanismide v\u00e4ltimiseks erinevates teenustes ja keskkondades (nt \u00f5ppimiskeskkonnad, online-liideseid, sisseehitatud t\u00f6\u00f6tlejad jne), mis lubavad Pythonis koodi t\u00e4itmist, kuid piiravad saadaval olevaid k\u00f5nesid ja ei luba kasutada selliseid meetodeid nagu os.system. <\/p>\n

Eten\u00e4htud kood on os.systemi kutse analoog, mis t\u00f6\u00f6tab CPython'i haavatavust \u00e4ra kasutades. Eksploidi t\u00f6\u00f6tab k\u00f5igi Python 3 versioonide peal x86-64 arhitektuuriga s\u00fcsteemides ja t\u00f5endab stabiilset t\u00f6\u00f6tlust Ubuntu 22.04, isegi kui PIE, RELRO ja CET kaitsere\u017eiimid on sisse l\u00fclitatud. T\u00f6\u00f6 seisneb selles, et saame Python koodist teavet \u00fche funktsiooni aadressi kohta CPython'i t\u00e4idetud koodis. Selle aadressi p\u00f5hjal arvutatakse CPython'i p\u00f5hiaadress m\u00e4lus ja adress system() funktsiooni laaditud instantsis libc. L\u00f5puks algatatakse otsene h\u00fcpe kindlasse aadressi system, asendades esimese argumendi n\u00e4idiku stringiga '\/bin\/sh'.

\"Pythonis<\/center>
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Allikas: 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\udd47Haavatavus Pythonis, mis v\u00f5imaldab kutsuda s\u00fcsteemik\u00e4ske isoleeritud skriptidest | ProHoster","description":"Avaldatud on meetod koodi isoleeritud t\u00e4itmise s\u00fcsteemide \u00fcmbers\u00f5iduks Pythonis, mis p\u00f5hineb ammu tuntud veal, mis ilmus Python 2.7-s, tuvastatud 2012. aastal ja siiani 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