Ve v\u00fdvojov\u00e9m n\u00e1stroji Flatpak, kter\u00fd je ur\u010den k vytv\u00e1\u0159en\u00ed autonomn\u00edch bal\u00ed\u010dk\u016f, kter\u00e9 nejsou v\u00e1z\u00e1ny na konkr\u00e9tn\u00ed distribuce Linuxu a jsou izolov\u00e1ny od zbytku syst\u00e9mu, byla nalezena zranitelnost (CVE-2024-32462). Tato zranitelnost umo\u017e\u0148uje \u0161kodliv\u00e9 nebo kompromitovan\u00e9 aplikaci dod\u00e1van\u00e9 v bal\u00ed\u010dku flatpak obej\u00edt nastaven\u00fd re\u017eim sandboxov\u00e9 izolace a z\u00edskat p\u0159\u00edstup k soubor\u016fm v hlavn\u00edm syst\u00e9mu. Probl\u00e9m se projevuje pouze u bal\u00ed\u010dk\u016f, kter\u00e9 pou\u017e\u00edvaj\u00ed port\u00e1ly Freedesktop (xdg-desktop-portal), kter\u00e9 se pou\u017e\u00edvaj\u00ed k organizaci p\u0159\u00edstupu k prost\u0159edk\u016fm u\u017eivatelsk\u00e9ho prost\u0159ed\u00ed z izolovan\u00fdch aplikac\u00ed. Zranitelnost byla opravena v oprav\u00e1ch flatpak 1.15.8, 1.14.6, 1.12.9 a 1.10.9. Obchvatov\u00e1 cesta pro ochranu byla tak\u00e9 navr\u017eena ve verz\u00edch xdg-desktop-portal 1.16.1 a 1.18.4. <\/p>\n
D\u00edky zranitelnosti m\u016f\u017ee aplikace nach\u00e1zej\u00edc\u00ed se v izolovan\u00e9m prost\u0159ed\u00ed pou\u017e\u00edt rozhran\u00ed xdg-desktop-portal k vytvo\u0159en\u00ed souboru «.desktop» s p\u0159\u00edkazem pro spu\u0161t\u011bn\u00ed aplikace z Flatpak, co\u017e umo\u017e\u0148uje p\u0159\u00edstup k soubor\u016fm hlavn\u00edho syst\u00e9mu. Pro opu\u0161t\u011bn\u00ed izolovan\u00e9ho prost\u0159ed\u00ed se pou\u017e\u00edvaj\u00ed manipulace s parametrem «—command», kter\u00fd se pou\u017e\u00edv\u00e1 k p\u0159ed\u00e1n\u00ed n\u00e1zvu programu nach\u00e1zej\u00edc\u00edho se uvnit\u0159 Flatpak bal\u00ed\u010dku, kter\u00fd m\u00e1 b\u00fdt spu\u0161t\u011bn v izolovan\u00e9m prost\u0159ed\u00ed. Pro nastaven\u00ed izolovan\u00e9ho prost\u0159ed\u00ed pou\u017e\u00edv\u00e1 Flatpak n\u00e1stroj bwrap a p\u0159ed\u00e1v\u00e1 mu uveden\u00fd n\u00e1zev programu. Nap\u0159\u00edklad pro spu\u0161t\u011bn\u00ed n\u00e1stroje ls v izolovan\u00e9m prost\u0159ed\u00ed bal\u00ed\u010dku lze pou\u017e\u00edt konstrukci «flatpak run —command=ls org.gnome.gedit», co\u017e povede k spu\u0161t\u011bn\u00ed «bwrap <izola\u010dn\u00ed_parametry> ls». <\/p>\n
Podstata zranitelnosti spo\u010d\u00edv\u00e1 v tom, \u017ee pokud n\u00e1zev programu za\u010d\u00edn\u00e1 na znaky «—«, bude pova\u017eov\u00e1n n\u00e1strojem bwrap za vlastn\u00ed mo\u017enost. Nap\u0159\u00edklad spu\u0161t\u011bn\u00ed «flatpak run —command=—bind org.gnome.gedit \\\/ \\\/host ls -l \\\/host» povede k proveden\u00ed «bwrap <izola\u010dn\u00ed_parametry> —bind \\\/ \\\/host ls -l \\\/host», tj. n\u00e1zev «—bind» bude zpracov\u00e1n nikoli jako n\u00e1zev spou\u0161t\u011bn\u00e9 aplikace, ale jako mo\u017enost bwrap. <\/p>\n
Zranitelnost se zhor\u0161uje t\u00edm, \u017ee rozhran\u00ed D-Bus «org.freedesktop.portal.Background.RequestBackground» umo\u017e\u0148uje aplikaci z Flatpak bal\u00ed\u010dku uv\u00e9st jak\u00fdkoli p\u0159\u00edkaz k proveden\u00ed pomoc\u00ed «flatpak run —command», v\u010detn\u011b p\u0159\u00edkaz\u016f za\u010d\u00ednaj\u00edc\u00edch znakem «—«. P\u0159edpokl\u00e1dalo se, \u017ee p\u0159ed\u00e1n\u00ed jak\u00fdchkoli p\u0159\u00edkaz\u016f nen\u00ed nebezpe\u010dn\u00e9, proto\u017ee budou provedeny v izolovan\u00e9m prost\u0159ed\u00ed bal\u00ed\u010dku. Nelze v\u0161ak p\u0159ehl\u00e9dnout, \u017ee p\u0159\u00edkazy za\u010d\u00ednaj\u00edc\u00ed na «—» budou zpracov\u00e1ny jako mo\u017enosti n\u00e1stroje bwrap. V\u00fdsledkem je, \u017ee rozhran\u00ed xdg-desktop-portal m\u016f\u017ee b\u00fdt pou\u017eito k vytvo\u0159en\u00ed souboru «.desktop» s p\u0159\u00edkazem, kter\u00fd zneu\u017e\u00edv\u00e1 zranitelnost. \u0412 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 Flatpak, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u043c \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u0430\u043c\u043e\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043d\u0435 \u043f\u0440\u0438\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u043a \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u043c \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u043c Linux \u0438 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043e\u0442 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-32462). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u043e\u043c\u0443 \u0438\u043b\u0438 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044e, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c\u0443 \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 flatpak, \u043e\u0431\u043e\u0439\u0442\u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0439 \u0440\u0435\u0436\u0438\u043c sandbox-\u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0430\u043c \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u043f\u0430\u043a\u0435\u0442\u0430\u0445, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u043f\u043e\u0440\u0442\u0430\u043b\u044b Freedesktop (xdg-desktop-portal), \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0435 \u0434\u043b\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-115168","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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost ve flatpaku, kter\u00e1 umo\u017e\u0148uje obej\u00edt izolaci sandboxu | ProHoster","description":"V n\u00e1stroji Flatpak, ur\u010den\u00e9m pro vytv\u00e1\u0159en\u00ed sob\u011bsta\u010dn\u00fdch bal\u00ed\u010dk\u016f, kter\u00e9 nejsou v\u00e1z\u00e1ny na konkr\u00e9tn\u00ed distribuce Linuxu a jsou izolov\u00e1ny od zbytku syst\u00e9mu, byla zji\u0161t\u011bna zranitelnost 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"