Byla zve\u0159ejn\u011bna informace o zranitelnosti v opera\u010dn\u00edm syst\u00e9mu Qubes, kter\u00fd pou\u017e\u00edv\u00e1 hypervizor pro p\u0159\u00edsnou izolaci aplikac\u00ed a komponent syst\u00e9mu (ka\u017ed\u00e1 t\u0159\u00edda aplikac\u00ed a syst\u00e9mov\u00e9 slu\u017eby b\u011b\u017e\u00ed ve samostatn\u00fdch virtu\u00e1ln\u00edch stroj\u00edch). V p\u0159\u00edpad\u011b, \u017ee \u00fato\u010dn\u00edk kompromituje jeden z virtu\u00e1ln\u00edch stroj\u016f, zranitelnost umo\u017e\u0148uje obej\u00edt izolaci, z\u00edskat prov\u00e1d\u011bn\u00ed libovoln\u00fdch p\u0159\u00edkaz\u016f na stran\u011b hostitelsk\u00e9ho prost\u0159ed\u00ed (Dom0) a ovl\u00e1dnout cel\u00fd opera\u010dn\u00ed syst\u00e9m. Probl\u00e9m se projevuje, kdy\u017e u\u017eivatel pou\u017e\u00edv\u00e1 n\u00e1stroj «qvm-copy-to-vm» k zkop\u00edrov\u00e1n\u00ed souboru z hostitelsk\u00e9ho prost\u0159ed\u00ed do virtu\u00e1ln\u00edho stroje pod kontrolou \u00fato\u010dn\u00edka. Zranitelnost byla odstran\u011bna v aktualizaci bal\u00ed\u010dku qubes-core-dom0-linux 4.3.22. <\/p>\n
Probl\u00e9m je p\u0159\u00edtomen v n\u00e1stroji «qvm-copy-to-vm» a je zp\u016fsoben nevhodn\u00fdm zpracov\u00e1n\u00edm chyb, kter\u00e9 se vrac\u00ed p\u0159i vol\u00e1n\u00ed na virtu\u00e1ln\u00edm stroji<\/a>. Podstatou zranitelnosti je, \u017ee n\u00e1stroj qvm-copy-to-vm pro zobrazen\u00ed informace o chyb\u011b spou\u0161t\u011bl programy kdialog nebo zenity, pou\u017e\u00edvaj\u00edc funkci system() a vkl\u00e1dal \u00fadaje o ne\u00fasp\u011b\u0161n\u011b zkop\u00edrovan\u00e9m souboru jako volby do p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku. P\u0159itom \u010di\u0161t\u011bn\u00ed n\u00e1zvu souboru bylo omezeno na odstran\u011bn\u00ed ne-ASCII znak\u016f a dvojit\u00fdch uvozovek bez ov\u011b\u0159en\u00ed p\u0159\u00edtomnosti speci\u00e1ln\u00edch znak\u016f, kter\u00e9 jsou interpretov\u00e1ny p\u0159\u00edkazov\u00fdm interpretem, jako jsou «`» a «$». <\/p>\n Po dokon\u010den\u00ed kop\u00edrov\u00e1n\u00ed soubor\u016f z hostitelsk\u00e9ho syst\u00e9mu zpracovatel na stran\u011b virtu\u00e1ln\u00edho stroje vrac\u00ed potvrzen\u00ed operace, ve kter\u00e9m je krom\u011b jin\u00e9ho uvedeno jm\u00e9no posledn\u00edho p\u0159ij\u00edman\u00e9ho souboru. \u00datok spo\u010d\u00edv\u00e1 v navr\u00e1cen\u00ed k\u00f3du chyby nam\u00edsto potvrzen\u00ed a ur\u010den\u00ed pro soubor, kter\u00fd se nepoda\u0159ilo zkop\u00edrovat, jm\u00e9na se zpracov\u00e1van\u00fdmi speci\u00e1ln\u00edmi znaky p\u0159\u00edkazov\u00e9ho interpretu. Po obdr\u017een\u00ed chyby zpracovatel na stran\u011b hostitelsk\u00e9ho prost\u0159ed\u00ed spust\u00ed p\u0159\u00edkazem system() n\u00e1stroj pro zobrazen\u00ed dialogu s textem chyby, p\u0159i\u010dem\u017e do p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku p\u0159ed\u00e1 vr\u00e1cen\u00e9 \u00fato\u010dnick\u00e9 jm\u00e9no souboru (nap\u0159\u00edklad p\u0159i uveden\u00ed «file`id`» na stran\u011b hostitelsk\u00e9ho prost\u0159ed\u00ed bude spu\u0161t\u011bn p\u0159\u00edkaz id). \u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 Qubes, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0439 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440 \u0434\u043b\u044f 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-183295","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\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v opera\u010dn\u00edm syst\u00e9mu Qubes umo\u017e\u0148uj\u00edc\u00ed obej\u00edt izolaci a vykonat k\u00f3d na \u00farovni Dom0 | ProHoster","description":"Byla zve\u0159ejn\u011bna informace o zranitelnosti v opera\u010dn\u00edm syst\u00e9mu Qubes, kter\u00fd vyu\u017e\u00edv\u00e1 hypervisor pro p\u0159\u00edsnou izolaci aplikac\u00ed a komponent OS (ka\u017ed\u00e1 t\u0159\u00edda aplikac\u00ed a 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"