Ve vyv\u00edjen\u00e9 knihovn\u011b libaom, kter\u00e1 poskytuje referen\u010dn\u00ed implementaci video k\u00f3dovac\u00edho form\u00e1tu AV1 a kterou spravuje aliance Open Media (AOMedia), byla odhalena kritick\u00e1 zranitelnost (CVE-2024-5171), kter\u00e1 vede k p\u0159ete\u010den\u00ed celo\u010d\u00edseln\u00e9 prom\u011bnn\u00e9 a z\u00e1pisu do oblasti mimo hranice z\u00e1sobn\u00edku p\u0159i zpracov\u00e1n\u00ed p\u0159\u00edli\u0161 velk\u00fdch hodnot v n\u011bkter\u00fdch parametrech. Podobn\u00e1 zranitelnost (CVE-2024-5197) byla odhalena v knihovn\u011b libvpx, kter\u00e1 implementuje kodeky VP8 a VP9. Probl\u00e9my byly odstran\u011bny v aktualizac\u00edch libaom 3.9.0 a libvpx 1.14.1. V distribuc\u00edch z\u016fst\u00e1vaj\u00ed zranitelnosti dosud neopraveny (Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD). <\/p>\n
Zranitelnost v libaom byla p\u0159i\u0159azena maxim\u00e1ln\u00ed \u00farove\u0148 nebezpe\u010d\u00ed (10 z 10), co\u017e implikuje mo\u017enost zneu\u017eit\u00ed p\u0159i zpracov\u00e1v\u00e1n\u00ed speci\u00e1ln\u011b vytvo\u0159en\u00e9ho obsahu v aplikac\u00edch, kter\u00e9 pou\u017e\u00edvaj\u00ed tuto knihovnu. U libvpx byla \u00farove\u0148 nebezpe\u010d\u00ed stanovena na 5,9 z 10, co\u017e odpov\u00edd\u00e1 omezen\u00fdm mo\u017enostem zneu\u017eit\u00ed. Hrozba zranitelnost\u00ed v libaom a libvpx pramen\u00ed z toho, \u017ee tyto knihovny se pou\u017e\u00edvaj\u00ed v webov\u00fdch prohl\u00ed\u017ee\u010d\u00edch, multimedi\u00e1ln\u00edch p\u0159ehr\u00e1va\u010d\u00edch a slu\u017eb\u00e1ch pro p\u0159ek\u00f3dov\u00e1n\u00ed videa. <\/p>\n
Zranitelnost se projevuje v libaom p\u0159i vol\u00e1n\u00ed funkc\u00ed aom_img_alloc(), aom_img_wrap() nebo aom_img_alloc_with_border() s velk\u00fdmi hodnotami v parametrech d_w, d_h a align, kter\u00e9 vedou k p\u0159ete\u010den\u00ed celo\u010d\u00edseln\u00e9 prom\u011bnn\u00e9 p\u0159i v\u00fdpo\u010dtu offset\u016f a velikost\u00ed z\u00e1sobn\u00edk\u016f. Podobn\u00e9 p\u0159ete\u010den\u00ed se objevuje ve funkc\u00edch vpx_img_alloc() a vpx_img_wrap(). Uveden\u00e9 funkce se pou\u017e\u00edvaj\u00ed p\u0159i k\u00f3dov\u00e1n\u00ed videa. <\/p>\n
Nejv\u011bt\u0161\u00ed hrozbu zranitelnost p\u0159edstavuje kv\u016fli potenci\u00e1ln\u00ed mo\u017enosti \u00fatoku na prohl\u00ed\u017ee\u010de, kde mohly b\u00fdt d\u0159\u00edv\u011bj\u0161\u00ed podobn\u00e9 zranitelnosti zneu\u017eity prost\u0159ednictv\u00edm otev\u0159en\u00ed speci\u00e1ln\u011b navr\u017een\u00e9 str\u00e1nky v prohl\u00ed\u017ee\u010di, kter\u00e1 vyvol\u00e1v\u00e1 JavaScriptov\u00e9 funkce pro k\u00f3dov\u00e1n\u00ed videa, nebo prost\u0159ednictv\u00edm manipulac\u00ed s WebRTC. Podle z\u00e1stupc\u016f spole\u010dnosti Google tato zranitelnost nezasa\u017eila engine Chromium, proto\u017ee do funkc\u00ed aom_img_alloc(), aom_img_wrap(), vpx_img_alloc() a vpx_img_wrap() byly p\u0159ed\u00e1ny pouze ov\u011b\u0159en\u00e9 hodnoty argument\u016f d_w a d_h. V prohl\u00ed\u017ee\u010di Firefox pro dek\u00f3dov\u00e1n\u00ed AV1 pou\u017e\u00edv\u00e1 knihovnu dav1d, ale pro k\u00f3dov\u00e1n\u00ed se pou\u017e\u00edv\u00e1 libaom. Zda je Firefox touto probl\u00e9my posti\u017een, zat\u00edm nen\u00ed jasn\u00e9, proto\u017ee informace o tom, jak zranitelnost ovliv\u0148uje konkr\u00e9tn\u00ed produkty, zat\u00edm nebyly zve\u0159ejn\u011bny. \u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0430\u043b\u044c\u044f\u043d\u0441\u043e\u043c Open Media (AOMedia) \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libaom, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0434\u0435\u043e AV1, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-5171), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u0432\u043d\u0435 \u0433\u0440\u0430\u043d\u0438\u0446 \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u0445. \u0410\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-5197) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libvpx \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043a\u043e\u0434\u0435\u043a\u043e\u0432 VP8 \u0438 VP9. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 […]<\/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-116387","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 v referen\u010dn\u00edch 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"