{"id":52649,"date":"2019-11-13T00:00:00","date_gmt":"2019-11-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/vyyavlen-novyj-variant-ataki-zombieload-na-protsessory-intel"},"modified":"2020-02-18T14:00:26","modified_gmt":"2020-02-18T11:00:26","slug":"vyyavlen-novyj-variant-ataki-zombieload-na-protsessory-intel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vyyavlen-novyj-variant-ataki-zombieload-na-protsessory-intel","title":{"rendered":"Felfedeztek egy \u00faj Zombieload t\u00e1mad\u00e1st az Intel processzorokon","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A grazi m\u0171szaki egyetem kutat\u00f3i felfedt\u00e9k<\/a><\/noindex> inform\u00e1ci\u00f3kat tettek k\u00f6zz\u00e9 egy \u00faj, oldals\u00f3 csatorn\u00e1kon v\u00e9gzett t\u00e1mad\u00e1sr\u00f3l ZombieLoad 2.0<\/a><\/noindex> (CVE-2019-11135<\/a><\/noindex>), amely lehet\u0151v\u00e9 teszi bizalmas inform\u00e1ci\u00f3k kiszed\u00e9s\u00e9t m\u00e1s folyamatokb\u00f3l, oper\u00e1ci\u00f3s rendszerekb\u0151l, virtu\u00e1lis g\u00e9pekb\u0151l \u00e9s v\u00e9dett k\u00f6rnyezetekb\u0151l (TEE, Trusted Execution Environment). A probl\u00e9ma csak az Intel processzorokat \u00e9rinti. Az ehhez kapcsol\u00f3d\u00f3 alkatr\u00e9szek k\u00edn\u00e1lnak<\/a><\/noindex> a tegnapi mikrok\u00f3d friss\u00edt\u00e9sben<\/a><\/noindex>. <\/p>\n

A probl\u00e9ma az MDS (Microarchitectural Data Sampling) oszt\u00e1ly\u00e1ba tartozik, \u00e9s a m\u00e1jusban k\u00f6zz\u00e9tett<\/a><\/noindex> ZombieLoad t\u00e1mad\u00e1s moderniz\u00e1lt v\u00e1ltozata. A ZombieLoad 2.0, mint m\u00e1s MDS oszt\u00e1ly\u00fa t\u00e1mad\u00e1sok, az oldals\u00f3 csatorn\u00e1kra t\u00f6rt\u00e9n\u0151 elemz\u00e9si m\u00f3dszerek alkalmaz\u00e1s\u00e1n alapul a mikroarchitekt\u00farai strukt\u00far\u00e1k adataihoz (p\u00e9ld\u00e1ul a kit\u00f6lt\u0151 bufferekben (Line Fill Buffer) \u00e9s a t\u00e1rol\u00e1si bufferekben (Store Buffer), ahol ideiglenesen adatokat tartanak, amelyek az Load \u00e9s Store m\u0171veletek v\u00e9grehajt\u00e1sa sor\u00e1n haszn\u00e1ltak).<\/p>\n

Az \u00faj ZombieLoad t\u00e1mad\u00e1s v\u00e1ltozata azon alapul<\/a><\/noindex> hogy olyan sziv\u00e1rg\u00e1st okoz, amely a m\u0171veletek aszinkron megszak\u00edt\u00e1s\u00e1nak mechanizmus\u00e1n (TAA, TSX Asynchronous Abort) kereszt\u00fcl keletkezik, amelyet a TSX (Transactional Synchronization Extensions) kiterjeszt\u00e9s val\u00f3s\u00edt meg, mutatva az eszk\u00f6z\u00f6ket a tranzakci\u00f3s mem\u00f3ri\u00e1val val\u00f3 munk\u00e1hoz, lehet\u0151v\u00e9 t\u00e9ve a t\u00f6bb sz\u00e1l\u00fa alkalmaz\u00e1sok teljes\u00edtm\u00e9ny\u00e9nek n\u00f6vel\u00e9s\u00e9t a felesleges szinkroniz\u00e1ci\u00f3s m\u0171veletek dinamikus kiv\u00e9tel\u00e9vel (t\u00e1mogatott atomikus tranzakci\u00f3k, amelyeket vagy elfogadnak, vagy megszak\u00edtanak). Megszak\u00edt\u00e1s eset\u00e9n a tranzakci\u00f3s mem\u00f3riar\u00e9szben v\u00e9grehajtott m\u0171veletek vissza\u00e1llnak.<\/p>\n

A tranzakci\u00f3 megszak\u00edt\u00e1sa aszinkron m\u00f3don t\u00f6rt\u00e9nik, \u00e9s ezalatt m\u00e1s sz\u00e1lak hozz\u00e1f\u00e9rhetnek egy cache-hez, amely szint\u00e9n haszn\u00e1lva van a visszaesett tranzakci\u00f3s mem\u00f3ria ter\u00fcleten. A tranzakci\u00f3s megszak\u00edt\u00e1s kezdet\u00e9t\u0151l a t\u00e9nyleges befejez\u00e9s\u00e9ig nem z\u00e1rhat\u00f3 ki olyan helyzetek fell\u00e9p\u00e9se, amikor a processzor spekulat\u00edv v\u00e9grehajt\u00e1si m\u0171velet k\u00f6zben olvashat adatokat a bels\u0151 mikroarchitekt\u00far\u00e1s bufferekb\u0151l, \u00e9s \u00e1tadhatja \u0151ket egy spekulat\u00edvan v\u00e9grehajtott m\u0171veletnek. Ezt k\u00f6vet\u0151en a konfliktus felder\u00fcl, \u00e9s a spekulat\u00edv m\u0171velet elvet\u00e9sre ker\u00fcl, de az adatok a cache-ben maradnak, \u00e9s kinyerhet\u0151k oldals\u00f3 csatorn\u00e1kra \u00e9p\u00fcl\u0151 cache vissza\u00e1ll\u00edt\u00e1si m\u00f3dszerekkel. <\/p>\n

A t\u00e1mad\u00e1s l\u00e9nyege, hogy TSX tranzakci\u00f3kat ind\u00edtanak \u00e9s felt\u00e9teleket teremtenek azok aszinkron megszak\u00edt\u00e1s\u00e1hoz, melynek sor\u00e1n felt\u00e9telek alakulnak ki a bels\u0151 pufferekb\u0151l sz\u00e1rmaz\u00f3 tartalmak kisziv\u00e1rg\u00e1s\u00e1ra, amelyek spekulat\u00edvan megtelnek a CPU azon magj\u00e1n v\u00e9grehajtott mem\u00f3riaolvas\u00e1si m\u0171veletekb\u0151l sz\u00e1rmaz\u00f3 adatokkal. A kisziv\u00e1rg\u00e1s korl\u00e1tozott az aktu\u00e1lis fizikai CPU magra (amin a t\u00e1mad\u00f3 k\u00f3dja fut), de mivel a mikroarchitekt\u00far\u00e1k pufferei megosztva haszn\u00e1latosak a Hyper-Threading \u00fczemm\u00f3dban, el\u0151fordulhat mem\u00f3riaolvas\u00e1si m\u0171veletek kisziv\u00e1rg\u00e1sa, amelyek m\u00e1s CPU sz\u00e1lakban futnak. <\/p>\n

T\u00e1mad\u00e1s alatt<\/a><\/noindex> t\u00f6bb nyolcadik, kilencedik \u00e9s tizedik gener\u00e1ci\u00f3s Intel Core processzor, valamint Intel Pentium Gold, Intel Celeron 5000, Intel Xeon E, Intel Xeon W \u00e9s a m\u00e1sodik gener\u00e1ci\u00f3s Intel Xeon Scalable modellek is \u00e9rintettek. Ide tartoznak az \u00fajonnan bemutatott Intel processzorok is, amelyek az \u00e1prilisi Cascade Lake mikroarchitekt\u00far\u00e1ra \u00e9p\u00fclnek, amely eredetileg nem volt kit\u00e9ve az RIDL \u00e9s Fallout t\u00e1mad\u00e1soknak. A Zombieload 2.0 mellett a kutat\u00f3k azt is felfedezt\u00e9k, hogy lehets\u00e9ges a kor\u00e1bban javasolt MDS-t\u00e1mad\u00e1sok ellen v\u00e9delmet ny\u00fajt\u00f3 m\u00f3dszerek megker\u00fcl\u00e9se, amelyek a mikroarchitekt\u00far\u00e1k puffereinek t\u00f6rl\u00e9s\u00e9re szolg\u00e1l\u00f3 VERW utas\u00edt\u00e1s haszn\u00e1lat\u00e1n alapultak, amikor a kernelb\u0151l a felhaszn\u00e1l\u00f3i t\u00e9rbe visszat\u00e9rnek, vagy amikor \u00e1tadj\u00e1k a vez\u00e9rl\u00e9st egy vend\u00e9g rendszernek.<\/p>\n

Az Intel jelent\u00e9se szerint a heterog\u00e9n terhel\u00e9s\u0171 rendszerek eset\u00e9ben a t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1sa neh\u00e9zkes, mivel a mikroarchitekt\u00far\u00e1b\u00f3l sz\u00e1rmaz\u00f3 kisziv\u00e1rg\u00e1s az eg\u00e9sz rendszer aktivit\u00e1s\u00e1t lefedi, \u00e9s a t\u00e1mad\u00f3 nem tudja befoly\u00e1solni az el\u0151h\u00fazott adatok forr\u00e1s\u00e1t, azaz csak felhalmozhatja a kisziv\u00e1rg\u00e1s eredm\u00e9nyek\u00e9nt megjelen\u0151 inform\u00e1ci\u00f3kat, \u00e9s pr\u00f3b\u00e1lhat az adatok k\u00f6z\u00f6tt hasznos inform\u00e1ci\u00f3kat keresni, an\u00e9lk\u00fcl, hogy c\u00e9lzottan \u00e9rz\u00e9keln\u00e9 a konkr\u00e9t mem\u00f3ria c\u00edmekhez kapcsol\u00f3d\u00f3 adatokat. Ennek ellen\u00e9re a kutat\u00f3k k\u00f6zz\u00e9tettek exploitat<\/a><\/noindex>, amely Linux \u00e9s Windows rendszeren m\u0171k\u00f6dik, \u00e9s bemutatt\u00e1k a t\u00e1mad\u00e1s lehet\u0151s\u00e9g\u00e9t a root felhaszn\u00e1l\u00f3 jelszav\u00e1nak hash \u00e9rt\u00e9k\u00e9nek meghat\u00e1roz\u00e1s\u00e1ra.
\nLehets\u00e9ges<\/a><\/noindex> t\u00e1mad\u00e1st v\u00e9grehajtani egy vend\u00e9g rendszerr\u0151l az olyan adatok felhalmoz\u00e1s\u00e1ra, amelyek m\u00e1s vend\u00e9g rendszerek, a host k\u00f6rnyezet, a hiperny\u0171g \u00e9s az Intel SGX enclave-ok m\u0171veleteiben szerepelnek.<\/p>\n

\r\n \"Vide\u00f3\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

Jav\u00edt\u00e1sokat adtak ki a sebezhet\u0151s\u00e9g blokkol\u00e1s\u00e1ra beleker\u00fcltek<\/a><\/noindex> a Linux kernel k\u00f3dalapj\u00e1ba, \u00e9s ezek beker\u00fcltek a k\u00f6vetkez\u0151 kiad\u00e1sokba \t5.3.11, 4.19.84, 4.14.154, 4.9.201 \u00e9s 4.4.201<\/a><\/noindex>. Friss\u00edt\u00e9sek a kernellel \u00e9s mikrok\u00f3ddal szint\u00e9n m\u00e1r ki lettek adva a f\u0151bb disztrib\u00faci\u00f3khoz (Debian<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, FreeBSD<\/a><\/noindex>). A probl\u00e9ma \u00e1prilisban v\u00e1lt nyilv\u00e1nval\u00f3v\u00e1, \u00e9s a jav\u00edt\u00e1st az Intel az oper\u00e1ci\u00f3s rendszerek fejleszt\u0151ivel egy\u00fcttm\u0171k\u00f6dve koordin\u00e1lta.<\/p>\n

A lege simple m\u00f3dszer a Zombieload 2.0 blokkol\u00e1s\u00e1ra a TSX t\u00e1mogat\u00e1s\u00e1nak letilt\u00e1sa a CPU-ban. A Linux kernelhez javasolt jav\u00edt\u00e1s t\u00f6bb v\u00e9delmi lehet\u0151s\u00e9get is mag\u00e1ban foglal. Az els\u0151 lehet\u0151s\u00e9g egy «tsx=on\/off\/auto» param\u00e9tert aj\u00e1nl, amely lehet\u0151v\u00e9 teszi a TSX kiterjeszt\u00e9s enged\u00e9lyez\u00e9s\u00e9nek kezel\u00e9s\u00e9t a CPU-ban (az auto \u00e9rt\u00e9k csak a sebezhet\u0151 CPU-kn\u00e1l tiltja le a TSX-et). A m\u00e1sodik v\u00e9delmi lehet\u0151s\u00e9g a «tsx_async_abort=off\/full\/full,nosmt» param\u00e9terrel aktiv\u00e1lhat\u00f3, \u00e9s a mikroarchitekt\u00far\u00e1s pufferek t\u00f6rl\u00e9s\u00e9n alapul a kontextusv\u00e1lt\u00e1s sor\u00e1n (a nosmt z\u00e1szl\u00f3 kieg\u00e9sz\u00edt\u0151leg letiltja az SMT\/Hyper-Threadinget). A rendszer sebezhet\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9re a sysfs-ben a «\/sys\/devices\/system\/cpu\/vulnerabilities\/tsx_async_abort» param\u00e9ter \u00e1ll rendelkez\u00e9sre.<\/p>\n

Ezen k\u00edv\u00fcl, a friss\u00edt\u00e9s<\/a><\/noindex> mikrok\u00f3d eliminates<\/a><\/noindex> m\u00e9g egy vulnerability<\/a><\/noindex> (CVE-2018-12207<\/a><\/noindex>) az Intel processzorokban, amely szint\u00e9n blokkolva van a leg\u00fajabb friss\u00edt\u00e9s<\/a><\/noindex> Linux kernelt. A sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt t\u00e1mad\u00f3 szolg\u00e1ltat\u00e1smegtagad\u00e1st okozzon, ami a rendszert 'Machine Check Error' \u00e1llapotba hozza. MMM-DD-YYYY<\/a><\/noindex> nem privilegiz\u00e1lt t\u00e1mad\u00f3nak kezdem\u00e9nyeznie kell egy szolg\u00e1ltat\u00e1smegtagad\u00e1st, amely a rendszert «Machine Check Error» \u00e1llapotba vezet.
\n a vend\u00e9g rendszeren kereszt\u00fcl is v\u00e9grehajthat\u00f3. \ud83e\udd47\u00daj Zombieload t\u00e1mad\u00e1si vari\u00e1ns ker\u00fclt el\u0151 az Intel processzorok ellen | ProHoster<\/a><\/noindex> \ud83e\udd47\u00daj Zombieload t\u00e1mad\u00e1si vari\u00e1ns \u00e9szlelve Intel processzorokon | ProHoster<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f) \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u043d\u043e\u0432\u043e\u043c \u043c\u0435\u0442\u043e\u0434\u0435 \u0430\u0442\u0430\u043a\u0438 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c ZombieLoad 2.0 (CVE-2019-11135), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u043c \u0438\u0437\u0432\u043b\u0435\u0447\u044c \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u0438\u0437 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d \u0438 \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0445 \u0430\u043d\u043a\u043b\u0430\u0432\u043e\u0432 (TEE, Trusted Execution Environment). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u044b Intel. \u041a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b \u0434\u043b\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u0432\u043e \u0432\u0447\u0435\u0440\u0430\u0448\u043d\u0435\u043c \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 MDS […]<\/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-52649","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\udd47\u00daj Zombieload t\u00e1mad\u00e1si vari\u00e1ns felfedezve az Intel processzorokon | 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