{"id":33659,"date":"2019-10-31T21:53:59","date_gmt":"2019-10-31T18:53:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/predstavlen-novyj-klass-uyazvimostej-v-protsessorah-intel\/"},"modified":"2019-10-31T21:53:59","modified_gmt":"2019-10-31T18:53:59","slug":"predstavlen-novyj-klass-uyazvimostej-v-protsessorah-intel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/predstavlen-novyj-klass-uyazvimostej-v-protsessorah-intel","title":{"rendered":"Esitati uus haavatavuste klass Intel'i protsessorites","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Intel Corporation <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/security-center\/advisory\/intel-sa-00233.html\">avalikustas<\/a><\/noindex> teave uuest <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">haavatavuse klassist<\/a><\/noindex> oma protsessorites \u2014 <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/\">MDS<\/a><\/noindex> (Microarchitectural Data Sampling). Nagu varasemad Spectre klassi r\u00fcnnakud, v\u00f5ivad uued probleemid viia operatsioonis\u00fcsteemi, virtuaalmasinate ja teiste protsesside konfidentsiaalsete andmete lekkimiseni. Teadaolevalt tuvastasid probleemid esmalt Intel'i t\u00f6\u00f6tajad ja partnerid siseauditi k\u00e4igus, mille j\u00e4rel jagasid s\u00f5ltumatud teadlased teavet sarnaste probleemide kohta Intelis. AMD ja ARM protsessorid ei ole sellele probleemile vastuv\u00f5tlikud.<\/p>\n<p>Tuginedes teadlaste tuvastatud probleemidele Graz'i Tehnika\u00fclikoolist (Austria) <noindex><a rel=\"nofollow\" href=\"https:\/\/cpu.fail\/\">on v\u00e4lja t\u00f6\u00f6tatud<\/a><\/noindex> mitmeid praktilisi r\u00fcnnakuid k\u00fclgkanalite kaudu:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/zombieloadattack.com\/\">ZombieLoad<\/a><\/noindex>  (<noindex><a rel=\"nofollow\" href=\"https:\/\/zombieloadattack.com\/zombieload.pdf\">PDF<\/a><\/noindex>) \u2014 v\u00f5imaldab eraldada konfidentsiaalset teavet teistest protsessidest, operatsioonis\u00fcsteemist, virtuaalmasinatest ja kaitstud k\u00e4\u00e4nikutest (TEE, Trusted Execution Environment). N\u00e4iteks on demonstreeritud v\u00f5imalust m\u00e4\u00e4rata Tor brauseri k\u00fclastuste ajalugu, kui see on k\u00e4ivitatud teises virtuaalmasinas, samuti m\u00e4\u00e4rata rakendustes kasutatavaid p\u00e4\u00e4sukochleid ja parolle;\n<p><center><br \/>\n<video controls=\"\" style=\"width: 720px; max-width:100%\" poster=\"https:\/\/zombieloadattack.com\/public\/images\/demo.jpg\"  src=\"https:\/\/zombieloadattack.com\/public\/videos\/demo_720.mp4\"><source src=\"https:\/\/zombieloadattack.com\/public\/videos\/demo_720.mp4\" type=\"video\/mp4\" label=\"720p\"><\/video><\/center><\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/\">RIDL<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/files\/ridl.pdf\">PDF<\/a><\/noindex>) \u2014 v\u00f5imaldab korraldada teabe lekkeid erinevate isoleeritud piirkondade vahel Intel protsessorites, nagu andmevahetuspuurid, salvestuspuurid ja laadimisportid. R\u00fcnnaku n\u00e4iteid on n\u00e4idatud teabe lekete korraldamiseks teistest protsessidest, operatsioonis\u00fcsteemist, virtuaalmasinatest ja kaitstud k\u00e4\u00e4nikutest. N\u00e4iteks on n\u00e4idatud, kuidas teada saada root parooli r\u00e4si sisu \/etc\/shadow failist aeg-ajalt autentimise katsete k\u00e4igus (r\u00fcnnak kestis 24 tundi);\n<p><center><div class=\"youtube-placeholder\" data-id=\"JXPebaGY8RA\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/JXPebaGY8RA\/hqdefault.jpg\" alt=\"M\u00e4ngi videot\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>Lisaks on n\u00e4idatud r\u00fcnnaku n\u00e4idet JavaScripti ja WebAssembly abil, kui avati pahavara lehte SpiderMonkey mootoris (kaasaegsetes t\u00e4ielikes brauserites on sellise r\u00fcnnaku t\u00f5en\u00e4osus v\u00e4ike, kuna taimeri t\u00e4psuse piirangud ja meetmed Spectre'i vastu);<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"KAgoDQmod1Y\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/KAgoDQmod1Y\/hqdefault.jpg\" alt=\"M\u00e4ngi videot\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/\">Fallout<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/files\/fallout.pdf\">PDF<\/a><\/noindex>) \u2014 annab v\u00f5imaluse lugeda andmeid, mis on hiljuti salvestatud operatsioonis\u00fcsteemi ja m\u00e4\u00e4rata OS-i m\u00e4lu jaotust, et lihtsustada teiste r\u00fcnnakute teostamist;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/cpu.fail\/store_to_leak_forwarding.pdf\">Store-To-Leak Forwarding<\/a><\/noindex> \u2014 kasutab CPU optimeerimisi andmevahetuspuuride t\u00f6\u00f6tlemiseks ja seda saab kasutada kerneliruumi adresseerimise randomiseerimise mehhanismi (KASLR) \u00fcmbersuunamiseks, et j\u00e4lgida operatsioonis\u00fcsteemi olekut v\u00f5i seda, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cyberus-technology.de\/posts\/2019-05-14-zombieload.html\">bufferite jagamiseks mitme protsessi vahel nendele tekstuuridele, mis on asetatud videom\u00e4lu. Lisaks on lisatud j\u00f5udluse optimeerimised piltide dekodeerimise jaoks, mis kasutavad kiiruselisi SIMD k\u00e4ske ja v\u00e4hendavad formaadi konversiooni aega 5-10%.<\/a><\/noindex> andmete lekkimise korraldamiseks koos Spectre meetodite p\u00f5hjal loodud seadmetega.\n<\/ul>\n<p>Tuvastatud <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/microarchitectural-data-sampling\">haavatavuse<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> CVE-2018-12126 \u2014 MSBDS (Microarchitectural Store Buffer Data Sampling), salvestuspuuride sisu taastamine. Kasutatakse Fallout r\u00fcnnakus. Ohtlikkuse aste on m\u00e4\u00e4ratud 6,5 punkti (CVSS);\n<li class=\"l\"> CVE-2018-12127 \u2014 MLPDS (Microarchitectural Load Port Data Sampling), laadimisportide sisu taastamine. Kasutatakse RIDL r\u00fcnnakus. CVSS 6,5;\n<li class=\"l\"> CVE-2018-12130 \u2014 MFBDS (Microarchitectural Fill Buffer Data Sampling), t\u00e4itepuuride sisu taastamine. Kasutatakse r\u00fcnnakutes ZombieLoad ja RIDL. CVSS 6,5;\n<li class=\"l\"> CVE-2019-11091 \u2014 MDSUM (Microarchitectural Data Sampling Uncacheable Memory), seda taastamine, mis on salvestatud mittevahemiku m\u00e4llu. Kasutatakse RIDL r\u00fcnnakus. CVSS 3,8.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/deep-dive-intel-analysis-microarchitectural-data-sampling\">Sisu<\/a><\/noindex> Tuvastatud probleemid kanali kaudu anal\u00fc\u00fcsimeetodite rakendamise v\u00f5imalustes mikroarhitektuuriliste struktuuride andmetele, millele rakendused otse ei p\u00e4\u00e4se. Teema k\u00e4sitleb madalama taseme struktuure, nagu t\u00e4itemeetodid (Line Fill Buffer), salvestusbuffereid (Store Buffer) ja laadimisporte (Load Port), mis on v\u00e4iksemat t\u00fc\u00fcpi koostisosad kui esimese taseme vahem\u00e4lu (L1D), andmete laadimise vahem\u00e4lu (RDCL) v\u00f5i L1TF (L1 Terminal Fault) ning seega sisaldavad v\u00e4hem teavet ja uueneb sagedamini.<br \/>\n<center><img decoding=\"async\" alt=\"Esitati uus haavatavuste klass Intel&#039;i protsessorites\" src=\"\/wp-content\/uploads\/2019\/05\/205ff034e070b8b057f01c02d6381c2a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Mikroarhitektuuriliste struktuuride kanalip\u00f5hised r\u00fcnnakud on oluliselt keerulisemad v\u00f5rreldes vahem\u00e4lu andmesisu taastamise meetoditega ning n\u00f5uavad suurte andmemahtude j\u00e4lgimist ja anal\u00fc\u00fcsimist nende seose tuvastamiseks konkreetsete m\u00e4lu aadressidega (praktikas ei saa r\u00fcndaja sihip\u00e4raselt teatud andmeid kinni p\u00fc\u00fcda, vaid v\u00f5ib pika aja jooksul akumuleerida lekkekandeid ning rakendada statistilisi meetodeid teatud andmet\u00fc\u00fcpide rekonstrueerimiseks). Lisaks m\u00f5jutab r\u00fcnnak ainult andmeid samas f\u00fc\u00fcsilises CPU tuumas, mis on r\u00fcndaja koodi asukohaks.<\/p>\n<p>E propuestas, m\u00e4\u00e4ratakse mikroarhitektuuriliste struktuuride andmesisu spekulatiivse vahejuhtumite (fault) v\u00f5i laadimis- ja salvestusoperatsioonide k\u00e4igus.<br \/>\nSpekulatiivse t\u00e4itmise k\u00e4igus suunatakse sisemiste struktuuride sisu t\u00f6\u00f6tlemiseks registritesse v\u00f5i vahem\u00e4lu. Spekulatiivsed operatsioonid ei l\u00f5peta ning tulemused loobutakse, kuid suunatud sisu saab m\u00e4\u00e4rata kanalip\u00f5histe vahem\u00e4lu anal\u00fc\u00fcsimeetodite abil.<\/p>\n<p>Laadimisportid on protsessori poolt kasutatavad m\u00e4lu v\u00f5i sisendi\/v\u00e4ljundi alam\u00fcsteemist andmete saamises ja saadud teabe edastamiseks CPU registritesse. Kuna vanade laadimisoperatsioonide andmed j\u00e4\u00e4vad portidesse enne nende \u00fclekirjutamist uute andmetega, saab efektiivselt m\u00e4\u00e4rata laadimisporti andmete oleku, tehes erandite (fault) ja SSE\/AVX\/AVX-512 k\u00e4skude kaudu, mis laadivad rohkem kui 64 bitti andmeid. Sellistes tingimustes spekulatiivsed laadimisoperatsioonid paljastavad aegunud andmed sisemistest struktuuridest s\u00f5ltuvates operatsioonides. Sarnane andmete lekkimine toimub ka m\u00e4lupuhvris, mida kasutatakse CPU vahem\u00e4lu kirjutamise kiirendamiseks ja mis sisaldab aadresside, v\u00e4\u00e4rtuste ja lipukeste tabelit, samuti t\u00e4item\u00e4lu, mis sisaldab andmeid, kuni L1 vahem\u00e4lus puuduvad (cache-miss), kuni need laaditakse teistest vahem\u00e4lutasanditest.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1557869220.png\"><img decoding=\"async\" alt=\"Esitati uus haavatavuste klass Intel&#039;i protsessorites\" src=\"\/wp-content\/uploads\/2019\/05\/1f8bf290cd6ecbec5a5f17cc3103010d.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Probleem <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/engineering-new-protections-into-hardware.html\">puudutab<\/a><\/noindex> Intel'i protsessori mudelid, mis on toodetud alates 2011. aastast (alates 6. p\u00f5lvkonnast). Samuti blokeeritakse riistvara tasemel haavatavused alates m\u00f5nest 8. ja 9. p\u00f5lvkonna Intel Core mudelist ning 2. p\u00f5lvkonna Intel Xeon Scalable mudelist (selle saab kontrollida bit ARCH_CAP_MDS_NO kaudu IA32_ARCH_CAPABILITIES MSR). Haavatavused on juba <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">on k\u00f5rvaldatud<\/a><\/noindex> veel tasemel p\u00fcsivara, mikroprogrammeerimise ja operatsioonis\u00fcsteemide. Intel'i hinnangul on enamikule kasutajatest j\u00f5udluse kaotus p\u00e4rast paranduse aktiveerimist <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">mitte \u00fcletab<\/a><\/noindex> 3%. Hyper-Threading'i tehnoloogia v\u00e4ljal\u00fclitamisel v\u00f5ib j\u00f5udluse langus ulatuda 9%-ni SPECint_rate_base testis, 11%-ni aktiivsete t\u00e4isarvuliste arvutuste korral ning 19%-ni serveri Java rakenduste k\u00e4itamisel (HT lubamisel on j\u00f5udluse langus peaaegu olematu). Parandused ei m\u00f5juta praktiliselt andme sisendi\/v\u00e4ljundi operatsioonide j\u00f5udlust.<\/p>\n<p>Linuxi k\u00e4rus on MDS-i kaitse <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=fa4bff165070dc40a3de35b78e4f8da8e8d85ec5\">lisatud<\/a><\/noindex> t\u00e4na <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/\">uuendustes<\/a><\/noindex>  \t5.1.2, 5.0.16,<br \/>\n4.19.43, 4.14.119 ja 4.9.176. Kaitsemeetod <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/html\/latest\/x86\/mds.html#mds\">p\u00f5hineb<\/a><\/noindex> mikroarhitektuuriliste puhversalte sisu puhastamisel vahetamisel kernist kasutaja ruumi v\u00f5i edastamisel juhtimise host-s\u00fcsteemile, mille jaoks kasutatakse k\u00e4sku VERW. Selle kaitse toimimiseks on vajalik toetada MD_CLEAR re\u017eiimi, mis on rakendatud v\u00e4rskes mikroprogrammeerimise uuenduses. T\u00e4ieliku kaitse tagamiseks on soovitatav ka Hyper-Threading v\u00e4lja l\u00fclitada. S\u00fcsteemi haavatavuse kontrollimiseks kernelis Linux <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/html\/latest\/admin-guide\/hw-vuln\/mds.html\">on lisatud<\/a><\/noindex> k\u00e4itleja \u2018\/sys\/devices\/system\/cpu\/vulnerabilities\/mds\u2019. Erinevate haavatavuste blokeerimise re\u017eiimide aktiveerimise haldamiseks on p\u00f5hikoodile lisatud parameeter \u2018mds=\u2019, mille v\u00e4\u00e4rtused v\u00f5ivad olla \u2018full\u2019, \u2018full,nosmt\u2019 (Hyper-Threads'i keelamine), \u2018vmwerv\u2019 ja \u2018off\u2019.<\/p>\n<p> Pakettide uuendused on juba v\u00e4lja antud <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2018-12127\">RHEL<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2018\/CVE-2018-12127.html\">Ubuntu<\/a><\/noindex>, kuid need on endiselt k\u00e4ttesaamatud <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2018-12130\">Debian<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bodhi.fedoraproject.org\/updates\/?releases=F30&#038;type=security\">Fedora<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.suse.com\/security\/cve\/CVE-2018-12127\/\">SUSE<\/a><\/noindex>.<br \/>\nParandus andmeleakide blokeerimiseks virtuaalmasinatest on samuti <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-297.html\">on loodud<\/a><\/noindex> Xeni h\u00fcperviisori jaoks. Virtuaals\u00fcsteemide kaitsmiseks, mis kutsuvad enne teise virtuaalmasina juhtimise edasiandmist esile k\u00e4su L1D_FLUSH, ning Intel SGX enklaavide kaitseks piisab mikrokoodi uuendamisest.  <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Intel \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u043d\u043e\u0432\u043e\u043c \u043a\u043b\u0430\u0441\u0441\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0441\u0432\u043e\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 &#8212; MDS (Microarchitectural Data Sampling). \u041a\u0430\u043a \u0438 \u043f\u0440\u043e\u0448\u043b\u044b\u0435 \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Spectre \u043d\u043e\u0432\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0442\u0435\u0447\u043a\u0435 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \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 \u0447\u0443\u0436\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432. \u0423\u0442\u0432\u0435\u0440\u0436\u0434\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441\u043f\u0435\u0440\u0432\u0430 \u0431\u044b\u043b\u0438 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0441\u043e\u0442\u0440\u0443\u0434\u043d\u0438\u043a\u0430\u043c\u0438 \u0438 \u043f\u0430\u0440\u0442\u043d\u0451\u0440\u0430\u043c\u0438 Intel \u0432 \u0445\u043e\u0434\u0435 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0433\u043e \u0430\u0443\u0434\u0438\u0442\u0430, \u043f\u043e\u043b\u0435 \u0447\u0435\u0433\u043e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25348,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-33659","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Intel 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