{"id":33743,"date":"2019-10-31T21:54:27","date_gmt":"2019-10-31T18:54:27","guid":{"rendered":"https:\/\/prohoster.info\/blog\/intel-vam-ne-nuzhno-otklyuchat-hyper-threading-dlya-zashhity-ot-zombieload\/"},"modified":"2019-10-31T21:54:27","modified_gmt":"2019-10-31T18:54:27","slug":"intel-vam-ne-nuzhno-otklyuchat-hyper-threading-dlya-zashhity-ot-zombieload","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/intel-vam-ne-nuzhno-otklyuchat-hyper-threading-dlya-zashhity-ot-zombieload","title":{"rendered":"Intel: Nen\u00ed nutn\u00e9 vyp\u00ednat Hyper-Threading pro ochranu proti ZombieLoad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pokud po p\u0159edchoz\u00edch<\/a><\/noindex> novink\u00e1ch<\/a><\/noindex> Pokud se panicky sna\u017e\u00edte zjistit, jak deaktivovat funkci Intel Hyper-Threading, abyste zabr\u00e1nili vyu\u017eit\u00ed nov\u00e9 zranitelnosti podobn\u00e9 Spectre a Meltdown, zhluboka se nadechn\u011bte \u2014 ofici\u00e1ln\u00ed doporu\u010den\u00ed od Intelu to ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f vskutku nedoporu\u010duje.<\/p>\n

\"Intel:<\/p>\n

ZombieLoad je podobn\u00e1 p\u0159edchoz\u00edm \u00fatok\u016fm pomoc\u00ed \u201ebo\u010dn\u00edch kan\u00e1l\u016f\u201c (angl. side-channel attack), kter\u00e9 nut\u00ed procesory Intel otev\u00edrat p\u0159\u00edstup k potenci\u00e1ln\u011b citliv\u00fdm informac\u00edm, kter\u00e9 jsou obvykle izolov\u00e1ny a dostupn\u00e9 pouze pro aplikace, kter\u00e9 je pou\u017e\u00edvaj\u00ed. Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edci d\u0159\u00edve ozn\u00e1mili, \u017ee tato zranitelnost je p\u0159\u00edtomna ve v\u011bt\u0161in\u011b \u010dip\u016f Intel a m\u016f\u017ee b\u00fdt vyu\u017eita na Windows, MacOS a Linuxu.<\/p>\n

\"Intel:<\/p>\n

Intel na svou stranu nesouhlas\u00ed s t\u00edm, jak v\u00e1\u017en\u011b je riziko ZombieLoad hodnoceno. Spole\u010dnost se dokonce rozhodla nazvat ZombieLoad jin\u00fdm n\u00e1zvem \u2014 Microarchitectural Data Sampling (MDS) neboli Mikroarchitektonick\u00e1 v\u00fdb\u011br dat. P\u0159iznejme si, \u017ee to zn\u00ed mnohem m\u00e9n\u011b d\u011bsiv\u011b ne\u017e odkaz na n\u011bjak\u00e9 zomb\u00edky.<\/p>\n

<\/center><\/p>\n

\u201eZranitelnost MDS je zalo\u017eena na v\u00fdb\u011bru dat, kter\u00e1 prosakuj\u00ed z mal\u00fdch struktur v CPU p\u0159i pou\u017eit\u00ed lok\u00e1ln\u011b prov\u00e1d\u011bn\u00e9ho bo\u010dn\u00edho kan\u00e1lu spekulativn\u00edho vykon\u00e1v\u00e1n\u00ed,\u201c vysv\u011btluj\u00ed ve spole\u010dnosti. \u201ePraktick\u00e9 zneu\u017eit\u00ed MDS je velmi slo\u017eit\u00e9. Samotn\u00e1 zranitelnost \u00fato\u010dn\u00edkovi neposkytuje zp\u016fsob, jak vybrat ta data, kter\u00e1 by cht\u011bl z\u00edskat.\u201c<\/p>\n

\u201eMDS byla ji\u017e na hardwarov\u00e9 \u00farovni odstran\u011bna v mnoha na\u0161ich posledn\u00edch procesorech Intel Core 8. a 9. generace, stejn\u011b jako v rodin\u011b procesor\u016f Intel Xeon Scalable druh\u00e9 generace,\u201c uv\u00e1d\u00ed se ve zpr\u00e1v\u011b spole\u010dnosti. \u201ePro dal\u0161\u00ed zasa\u017een\u00e9 produkty jsou k dispozici opat\u0159en\u00ed ke sn\u00ed\u017een\u00ed rizika prost\u0159ednictv\u00edm aktualizace mikrocode v kombinaci s p\u0159\u00edslu\u0161n\u00fdmi aktualizacemi opera\u010dn\u00edho syst\u00e9mu a softwaru hypervizora, kter\u00e9 jsou dostupn\u00e9 ji\u017e od dne\u0161ka. Poskytli jsme dal\u0161\u00ed informace<\/a><\/noindex> na na\u0161ich webov\u00fdch str\u00e1nk\u00e1ch a nad\u00e1le vyz\u00fdv\u00e1me v\u0161echny, aby udr\u017eovali sv\u00e9 syst\u00e9my aktu\u00e1ln\u00ed, nebo\u0165 je to jeden z nejlep\u0161\u00edch zp\u016fsob\u016f, jak zajistit bezpe\u010dnost.\u201c<\/p>\n

\"Intel:<\/p>\n

Z\u00e1stupci spole\u010dnosti Intel tak\u00e9 uvedli, \u017ee v\u00fdzkumn\u00e1 skupina ZombieLoad spolupracovala se spole\u010dnost\u00ed a dal\u0161\u00edmi specialisty v oblasti PC, aby vy\u0159e\u0161ila zranitelnost, ne\u017e se o n\u00ed ve\u0159ejn\u011b dozv\u011bd\u011blo. \u201eCht\u011bli bychom vyj\u00e1d\u0159it na\u0161i vd\u011b\u010dnost v\u00fdzkumn\u00edk\u016fm, kte\u0159\u00ed s n\u00e1mi pracovali, a na\u0161im partner\u016fm v odv\u011btv\u00ed za jejich p\u0159\u00ednos k koordinovan\u00e9mu \u0159e\u0161en\u00ed tohoto probl\u00e9mu.\u201c<\/p>\n

Co tedy s Hyper-Threadingem?<\/strong><\/p>\n

Intel uvedl, \u017ee deaktivace Hyper-Threadingu nen\u00ed povinnou a jedinou mo\u017enost\u00ed pro u\u017eivatele PC. Ve skute\u010dnosti, podle spole\u010dnosti Intel, si ka\u017ed\u00fd klient rozhoduje s\u00e1m, co m\u00e1 d\u011blat. Pokud nem\u016f\u017eeme zaru\u010dit bezpe\u010dnost nainstalovan\u00e9ho softwaru, pak ano, pravd\u011bpodobn\u011b by deaktivace Hyper-Threadingu byla dobr\u00fdm n\u00e1padem. Pokud v\u0161ak je software dod\u00e1n pouze z obchodu Microsoft, z IT odd\u011blen\u00ed nebo byl prost\u011b nainstalov\u00e1n z d\u016fv\u011bryhodn\u00fdch, podle v\u00e1s, zdroj\u016f, pravd\u011bpodobn\u011b m\u016f\u017eete Hyper-Threading nechat zapnut\u00fd. Opravdu to z\u00e1le\u017e\u00ed jen na tom, jak moc se ob\u00e1v\u00e1te o svou bezpe\u010dnost.<\/p>\n

\u201eVzhledem k tomu, \u017ee faktory se zna\u010dn\u011b li\u0161\u00ed pro r\u016fzn\u00e9 klienty, Intel nedoporu\u010duje deaktivovat Hyper-Threading, proto\u017ee je d\u016fle\u017eit\u00e9 pochopit, \u017ee to nen\u00ed jedin\u00e1 cesta k zaji\u0161t\u011bn\u00ed ochrany proti MDS a samo o sob\u011b nezaji\u0161\u0165uje ochranu,\u201c uvedla spole\u010dnost ve sv\u00e9m prohl\u00e1\u0161en\u00ed.<\/p>\n

Z\u00e1rove\u0148 se reakce v\u00fdrobc\u016f opera\u010dn\u00edch syst\u00e9m\u016f li\u0161\u00ed.<\/p>\n

Google vydal opravu pro Chrome OS, kter\u00e1 ve v\u00fdchoz\u00edm nastaven\u00ed deaktivuje Hyper-Threading pro Chromebooky. Lid\u00e9, kte\u0159\u00ed cht\u011bj\u00ed technologii v\u00edcevl\u00e1knov\u00e9ho zpracov\u00e1n\u00ed znovu aktivovat, mohou to ud\u011blat sami, tvrd\u00ed spole\u010dnost.<\/p>\n

Apple vydal aktualizaci pro MacOS Mojave a uvedl, \u017ee z\u00e1kazn\u00edci spole\u010dnosti, zejm\u00e9na ti, kte\u0159\u00ed vy\u017eaduj\u00ed vysokou \u00farove\u0148 zabezpe\u010den\u00ed, mohou Hyper-Threading deaktivovat sami.<\/p>\n

Microsoft uvedl, \u017ee vydal z\u00e1platy pro sv\u016fj software, aby sn\u00ed\u017eil pravd\u011bpodobnost zneu\u017eit\u00ed MDS, ale tak\u00e9 poznamenal, \u017ee z\u00e1kazn\u00edci by m\u011bli d\u00e1le z\u00edskat aktualizace firmwaru od sv\u00fdch v\u00fdrobc\u016f PC.<\/p>\n

Vzhledem k tomu, \u017ee v\u011bt\u0161ina poskytovatel\u016f opera\u010dn\u00edch syst\u00e9m\u016f se rozhodla ponechat Hyper-Threading zapnut\u00fd, hrozba ZombieLoad zjevn\u011b nen\u00ed tak v\u00e1\u017en\u00e1, jak se zd\u00e1lo je\u0161t\u011b p\u0159ed 24 hodinami. Nav\u00edc dosud neexistuje \u017e\u00e1dn\u00fd zn\u00e1m\u00fd p\u0159\u00edpad vyu\u017eit\u00ed t\u00e9to zranitelnosti v re\u00e1ln\u00e9m \u00fatoku.<\/p>\n

Nicm\u00e9n\u011b pou\u017eit\u00ed patch\u016f bez vypnut\u00ed technologie Hyper-Threading t\u00e9m\u011b\u0159 nesn\u00ed\u017euje v\u00fdkon procesor\u016f Intel.<\/p>\n

\"Intel:<\/p>\n

Ale nebudete v\u011b\u0159it, pokud se pod\u00edv\u00e1te na v\u00fdsledky testov\u00e1n\u00ed<\/a><\/noindex> Intel vliv patch\u016f na v\u00fdkon p\u0159i vypnut\u00e9m Hyper-Threadingu. Spole\u010dnost tvrd\u00ed, \u017ee bezpe\u010dnostn\u00ed opravy spolu s vypnut\u00edm Hyper-Threadingu maj\u00ed podez\u0159ele mal\u00fd vliv na v\u00fdkon.<\/p>\n

\"Intel:<\/p>\n

Port\u00e1l PCWorld<\/a><\/noindex> kategoricky nesouhlas\u00ed s n\u00e1zorem Intelu, \u017ee vypnut\u00ed Hyper-Threadingu nep\u0159edstavuje z\u00e1sadn\u00ed probl\u00e9m, p\u0159esto\u017ee Intel ve sv\u00e9m dokumentu ukazuje, \u017ee v\u00fdkon se prakticky nezm\u011bnil. Probl\u00e9m spo\u010d\u00edv\u00e1 v um\u011blosti test\u016f Intelu p\u0159i vypnut\u00ed Hyper-Threadingu, proto\u017ee spole\u010dnost netestovala specifick\u00e9 v\u00edcetr\u017en\u00ed zat\u00ed\u017een\u00ed. Kdyby Intel pou\u017eil testy Blender, Cinebench nebo jin\u00e9, kter\u00e9 jsou zam\u011b\u0159eny na v\u00edce j\u00e1drov\u00e9 a v\u00edcetr\u017en\u00ed procesory, okam\u017eit\u011b bychom vid\u011bli v\u00e1\u017en\u00e9 selh\u00e1n\u00ed v rychlosti.<\/p>\n

Abychom zd\u016fraznili, jak d\u016fle\u017eit\u00e1 je technologie Hyper-Threading, sta\u010d\u00ed se pod\u00edvat na procesory Intel i9-9900K za 500 USD a i7-9700K za 375 USD, jejich\u017e hlavn\u00edm rozd\u00edlem je pr\u00e1v\u011b podpora Hyper-Threadingu. Deaktivace Hyper-Threadingu na procesorech Intel by byla obrovskou ranou pro v\u0161echny, kter\u00fdm z\u00e1le\u017e\u00ed na v\u00edcetrhu v\u00fdkonu.<\/p>\n

Ale je tu i dobr\u00e1 zpr\u00e1va pro ty, kte\u0159\u00ed pou\u017e\u00edvaj\u00ed nejnov\u011bj\u0161\u00ed procesory Intel. Jak uvedla spole\u010dnost, mnoh\u00e9 z jej\u00edch posledn\u00edch procesor\u016f 8. a 9. generace ji\u017e maj\u00ed opravy hardwarov\u00e9ho mikrok\u00f3du, tak\u017ee majitel\u00e9 i9-9900K nemaj\u00ed d\u016fvod vyp\u00ednat Hyper-Threading. Hrozba ZombieLoad je zjevn\u011b vy\u0161\u0161\u00ed pro star\u0161\u00ed procesory. Majitel\u00e9 t\u011bchto syst\u00e9m\u016f se budou muset spolehnout na aktualizace opera\u010dn\u00edho syst\u00e9mu a softwaru, stejn\u011b jako na funk\u010dnost pou\u017e\u00edvan\u00fdch antivirov\u00fdch \u0159e\u0161en\u00ed, aby sn\u00ed\u017eili riziko z\u00edsk\u00e1n\u00ed \u0161kodliv\u00e9ho k\u00f3du. A tak\u00e9 znovu p\u0159ipom\u00edn\u00e1me, \u017ee dosud nen\u00ed zn\u00e1ma \u017e\u00e1dn\u00e1 \u00fatok, kter\u00fd by vyu\u017eil ZombieLoad.<\/p>\n

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Zdroj: 3dnews.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0415\u0441\u043b\u0438 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0438\u0445 \u043d\u043e\u0432\u043e\u0441\u0442\u0435\u0439 \u043e ZombieLoad \u0432\u044b \u0432 \u043f\u0430\u043d\u0438\u043a\u0435 \u0432\u044b\u044f\u0441\u043d\u044f\u0435\u0442\u0435, \u043a\u0430\u043a \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u044e Intel Hyper-Threading, \u0447\u0442\u043e\u0431\u044b \u043f\u0440\u0435\u0434\u043e\u0442\u0432\u0440\u0430\u0442\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043d\u043e\u0432\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u0445\u043e\u0436\u0435\u0439 \u043d\u0430 Spectre \u0438 Meltdown, \u0442\u043e \u0441\u0434\u0435\u043b\u0430\u0439\u0442\u0435 \u0433\u043b\u0443\u0431\u043e\u043a\u0438\u0439 \u0432\u044b\u0434\u043e\u0445 — \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e Intel \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043d\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442 \u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e \u0434\u043b\u044f \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0430 \u0441\u043b\u0443\u0447\u0430\u0435\u0432. ZombieLoad \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u0430 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0438\u043c \u0430\u0442\u0430\u043a\u0430\u043c \u043f\u043e «\u043f\u043e\u0431\u043e\u0447\u043d\u044b\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c» (\u0430\u043d\u0433\u043b. side-channel attack), \u0432\u044b\u043d\u0443\u0436\u0434\u0430\u044e\u0449\u0438\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b Intel \u043e\u0442\u043a\u0440\u044b\u0432\u0430\u0442\u044c […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25423,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-33743","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\udd47Intel: Nen\u00ed nutn\u00e9 vyp\u00ednat Hyper-Threading pro ochranu p\u0159ed ZombieLoad | ProHoster","description":"Pokud po p\u0159edchoz\u00edch zpr\u00e1v\u00e1ch o ZombieLoad panika\u0159\u00edte, jak na 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