{"id":55763,"date":"2020-01-28T00:00:00","date_gmt":"2020-01-27T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/l1des-cacheout-i-vrs-novye-uyazvimosti-v-mikroarhitekturnyh-strukturah-cpu-intel"},"modified":"2020-02-18T14:03:54","modified_gmt":"2020-02-18T11:03:54","slug":"l1des-cacheout-i-vrs-novye-uyazvimosti-v-mikroarhitekturnyh-strukturah-cpu-intel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/l1des-cacheout-i-vrs-novye-uyazvimosti-v-mikroarhitekturnyh-strukturah-cpu-intel","title":{"rendered":"L1DES (CacheOut) ja VRS \u2014 uued haavatavused Intel CPU mikroarhitektuurides.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Intel Corporation <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.intel.com\/technology\/2020\/01\/ipas-intel-sa-00329\/\">avalikuks<\/a><\/noindex> teave kahe uue Intel CPU haavatavuse kohta, mis on p\u00f5hjustatud andmete lekimisest L1D vahem\u00e4lust (<noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/l1d-eviction-sampling\">CVE-2020-0549<\/a><\/noindex>, L1DES &#8212; L1D Eviction Sampling) \u0438 \u0432\u0435\u043a\u0442\u043e\u0440\u043d\u044b\u0445 \u0440\u0435\u0433\u0438\u0441\u0442\u0440\u043e\u0432 (<noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/vector-register-sampling\">CVE-2020-0548<\/a><\/noindex>, VRS &#8212; Vector Register Sampling). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442\u043d\u043e\u0441\u044f\u0442\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">MDS<\/a><\/noindex> (Mikroarhitektuurilised andmete proovimise meetodid) ja p\u00f5hinevad anal\u00fc\u00fcsimeetodite rakendamisel k\u00f5rvalkanalitest mikroarhitektuuriliste struktuuride andmetele. AMD, ARM ja muud protsessorid ei ole nende probleemide suhtes vastuv\u00f5tlikud.<\/p>\n<p>Suurimat ohtu kujutab endast L1DES haavatavus, mis  <noindex><a rel=\"nofollow\" href=\"https:\/\/access.redhat.com\/solutions\/l1d-cache-eviction-and-vector-register-sampling\">lubab<\/a><\/noindex> vahem\u00e4lu esimesest tasemest (L1D) v\u00e4lja t\u00f5rjutud vahem\u00e4ludatakandeid (cache line) j\u00e4\u00e4da t\u00e4itmisbufferisse (Fill Buffer), mis peaks sel hetkel olema t\u00fchi. Bufferisse j\u00e4\u00e4nud andmete m\u00e4\u00e4ratlemiseks v\u00f5ib rakendada k\u00f5rvalkanalite anal\u00fc\u00fcsimeetodeid, mis on varem ette pandud r\u00fcnnakutes <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">MDS<\/a><\/noindex> (Mikroarhitektuuriline andmete proovimine) ja <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51852\">TAA<\/a><\/noindex> (Tehinguline as\u00fcnkroonne katkestus). Varasemate MDS ja TAA kaitsekohtade sisu seisnes mikroarhitektuuriliste bufrite puhastamises enne konteksti vahetamist, kuid nagu selgus, v\u00f5ivad andmed m\u00f5nel tingimusel spekuleerivalt tagasi puhastamise operatsiooni j\u00e4rel bufritesse p\u00e4\u00e4seda, mist\u00f5ttu MDS ja TAA meetodid j\u00e4\u00e4vad kehtima.<br \/>\nL\u00f5ppkokkuv\u00f5ttes v\u00f5ib r\u00fcndaja saavutada, et m\u00e4\u00e4ravad v\u00e4lja t\u00f5rjutud andmed esimesest tasemest, mis on muudetud rakenduse t\u00e4itmise k\u00e4igus, mis eelnevalt kasutas praegust CPU tuuma, v\u00f5i rakenduste, mis k\u00e4ivad paralleelselt teistes loogilistes voogudes (hyperthread) samas CPU tuumas (HyperThreadingu keelamine nullib r\u00fcnnaku t\u00f5hususe). Erinevalt r\u00fcnnakust<\/p>\n<p><center><img decoding=\"async\" alt=\"L1DES (CacheOut) ja VRS - uued haavatavused Intel CPU mikroarhitektuuris\" src=\"\/wp-content\/uploads\/2020\/01\/0a5f61b0703517504135e27e32c762bc.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>L1TF <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49134\">, L1DES ei v\u00f5imalda valida konkreetseid f\u00fc\u00fcsilisi aadresse kontrollimiseks, kuid annab v\u00f5imaluse passiivselt j\u00e4lgida aktiivsust teistes loogilistes voogudes, mis on seotud v\u00e4\u00e4rtuste laadimise v\u00f5i salvestamisega m\u00e4lu.<\/a><\/noindex>L1DESi alusel on erinevad uurijate r\u00fchmad v\u00e4lja t\u00f6\u00f6tanud mitmeid r\u00fcnnakute variante, mis potentsiaalselt v\u00f5imaldavad konfidentsiaalsete andmete v\u00e4lja t\u00f5mbamist teistest protsessidest, operatsioonis\u00fcsteemist, virtuaalmasinatest ja kaitstud SGX anklavadest.<\/p>\n<p>VUSeci meeskond <\/p>\n<ul>\n<li class=\"l\"> kohandas <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/#ridl-nng\">RIDLi r\u00fcnnaku meetodit L1DES haavatavusele. Saadaval<\/a><\/noindex> \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 RIDL \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 L1DES. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/vusec\/ridl\/blob\/master\/pocs\/verw_bypass_l1des.c\">exploiti protot\u00fc\u00fcbi<\/a><\/noindex>, mis see muu hulgas \u00fcletab Intel'i MDS-i kaitsemeetodi, mis p\u00f5hineb VERW k\u00e4su kasutamisel mikroarhitektuuriliste puhvrite sisu puhastamiseks tuuma ja kasutaja ruumi vahel naasmisel v\u00f5i k\u00fcljest v\u00f5\u00f5rustavale s\u00fcsteemile juhtimise \u00fcleandmisel (uurijad v\u00e4itsid algselt, et VERW (mikroarhitektuuriliste puhvrite puhastamine) ei ole piisav kaitseks ja on vajalik L1 vahem\u00e4lu t\u00e4ielik t\u00fchjendamine iga konteksti vahetuse ajal).\n<li class=\"l\"> Meeskond <noindex><a rel=\"nofollow\" href=\"https:\/\/zombieloadattack.com\/\">ZombieLoad<\/a><\/noindex>  uuendas oma <noindex><a rel=\"nofollow\" href=\"https:\/\/zombieloadattack.com\/zombieload.pdf\">r\u00fcnde meetod<\/a><\/noindex> L1DES haavatavuse arvesse v\u00f5tmisega.\n<li class=\"l\"> Michigan'i \u00fclikooli teadlased t\u00f6\u00f6tasid v\u00e4lja omaenda r\u00fcndeviisi <noindex><a rel=\"nofollow\" href=\"https:\/\/cacheoutattack.com\/\">CacheOut<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/cacheoutattack.com\/CacheOut.pdf\">PDF<\/a><\/noindex>), mis v\u00f5imaldab t\u00f5mmata konfidentsiaalset teavet operatsioonis\u00fcsteemi kernist, virtuaalmasinatest ja kaitstud SGX anklavadest. Meetod p\u00f5hineb <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51852\">manipulatsioonidel<\/a><\/noindex> asus\u00fcnkroonse operatsiooni katkestamise mehhanismiga (TAA, TSX Asynchronous Abort), et m\u00e4\u00e4rata vahem\u00e4lu sisu p\u00e4rast andmelekke L1D vahem\u00e4lust.\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1580195677.png\"><img decoding=\"async\" alt=\"L1DES (CacheOut) ja VRS - uued haavatavused Intel CPU mikroarhitektuuris\" src=\"\/wp-content\/uploads\/2020\/01\/68cf9a4cf24206c7d226e0f69b8cad55.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<\/ul>\n<p>Teine haavatavus VRS (Vector Register Sampling) <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/vector-register-sampling\">seondub<\/a><\/noindex> vektoriregistritest lugemisoperatsioonide tulemuste lekkele salvestuspuhvris (Store Buffer), mis on muudetud vektorik\u00e4sudega (SSE, AVX, AVX-512) sama CPU tuuma k\u00e4ivitamisel. Leke toimub \u00fcsna harvade asjaolude t\u00f5ttu ja on p\u00f5hjustatud spekuleerimisest, mille t\u00f5ttu operatsioon, mis viib vektoriregistrite oleku peegelduse salvestuspuhvris, viibib ja l\u00f5peb p\u00e4rast puhvri puhastamist, mitte enne. Sarnaselt L1DES haavatavusele, saab salvestuspuhvri sisu seej\u00e4rel m\u00e4\u00e4rata MDS ja TAA r\u00fcnnaku meetodite abil.  <\/p>\n<p>VUSeci uurimisgrupi teadlased <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/#ridl-nng\">valmis<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/vusec\/ridl\/blob\/master\/pocs\/vrs.c\">exploiti protot\u00fc\u00fcbi<\/a><\/noindex>, mis v\u00f5imaldab m\u00e4\u00e4rata vektoriregistrite v\u00e4\u00e4rtusi, mis on saadud teiste sama CPU tuuma loogiliste koostisosade arvutuste tulemusena. Intel <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/vector-register-sampling\">hindas<\/a><\/noindex> VRS haavatavust liiga keeruliseks reaalsete r\u00fcnnakute teostamiseks ja andis sellele minimaalset ohtu (2.8 CVSS).<\/p>\n<p>Teave probleemidest edastati Intelile 2019. aasta mail Grazitehnika\u00fclikooli Zombieload meeskonna ja Amsterdami Vaba \u00dclikooli VUSec r\u00fchma poolt ning hiljem, p\u00e4rast teiste MDS r\u00fcnnaku rakendusvaldkondade anal\u00fc\u00fcsi, kinnitasid m\u00f5ned teised teadlased haavatavusi. Esimeses MDS aruandes ei sisaldunud L1DES ja VRS probleemide teavet, kuna lahendust ei olnud. Lahendus ei ole t\u00e4naseni saadaval, kuid n\u00f5utud avalikustamise t\u00e4htajad on m\u00f6\u00f6das.<br \/>\nKaitseks soovitatakse v\u00e4lja l\u00fclitada HyperThreading. Tuumapoolse haavatavuse blokeerimiseks soovitatakse t\u00fchjendada L1 vahem\u00e4lu igas kontekstit\u00f5lkes (MSR plokk MSR_IA32_FLUSH_CMD) ja v\u00e4lja l\u00fclitada TSX laiendus (MSR plokid MSR_IA32_TSX_CTRL ja MSR_TSX_FORCE_ABORT).<\/p>\n<p>Intel <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.intel.com\/technology\/2020\/01\/ipas-intel-sa-00329\/\">lubab<\/a><\/noindex> v\u00e4lja anda mikrokoodi uuendus, mis rakendab mehhanisme probleemide blokeerimiseks l\u00e4hitulevikus. Intel m\u00e4rkis ka, et 2018. aastal soovitatud kaitsemeetmete rakendamine r\u00fcnnaku vastu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49134\">, L1DES ei v\u00f5imalda valida konkreetseid f\u00fc\u00fcsilisi aadresse kontrollimiseks, kuid annab v\u00f5imaluse passiivselt j\u00e4lgida aktiivsust teistes loogilistes voogudes, mis on seotud v\u00e4\u00e4rtuste laadimise v\u00f5i salvestamisega m\u00e4lu.<\/a><\/noindex> (L1 Terminal Fault) v\u00f5imaldab blokeerida L1DES haavatavuse \u00e4rakasutamise virtuaalses keskkonnas. R\u00fcnnak <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/processors-affected-l1d-eviction-sampling\">on altid<\/a><\/noindex> Intel Core protsessorid alates kuuendast p\u00f5lvkonnast (Sky, Kaby, Coffee, Whiskey, Amber Lake jms), samuti m\u00f5ned Intel Xeon ja Xeon Scalable mudelid.<\/p>\n<p>Lisaks v\u00f5ib m\u00e4rkida <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/#ridl-nng\">t\u00e4iustamine<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/vusec\/ridl\/\">eksploid<\/a><\/noindex>, mis v\u00f5imaldab rakendada r\u00fcnnakumeetodeid <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/\">RIDL<\/a><\/noindex> k\u00fclmkapis asuva root parooli hash'i sisu tuvastamiseks \/etc\/shadow perioodiliste autentimis\u00fcrituste k\u00e4igus. Kui algselt pakutud eksploit m\u00e4\u00e4ras parooli hash'i <noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?v=JXPebaGY8RA\">24 tunni jooksul<\/a><\/noindex>, siis p\u00e4rast lekke rakendamist as\u00fcnkroonne katkestusmehanismi (TAA, TSX Asynchronous Abort) toimingute tegemisel sama operatsiooni 36 sekundi jooksul. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?v=zaTxBZXE9pQ\">, siis uus variant viib r\u00fcnnaku l\u00f5pule 4 sekundi jooksul.<\/a><\/noindex>, \u0442\u043e \u043d\u043e\u0432\u044b\u0439  \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0441\u043e\u0432\u0435\u0440\u0448\u0430\u0435\u0442 \u0430\u0442\u0430\u043a\u0443 \u0437\u0430 4 \u0441\u0435\u043a\u0443\u043d\u0434\u044b.<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"4DQAcCfg3b8\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/4DQAcCfg3b8\/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><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=52260\">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 \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0430 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 CPU Intel, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u044b\u0445 \u0443\u0442\u0435\u0447\u043a\u043e\u0439 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u043a\u044d\u0448\u0430 L1D (CVE-2020-0549, L1DES &#8212; L1D Eviction Sampling) \u0438 \u0432\u0435\u043a\u0442\u043e\u0440\u043d\u044b\u0445 \u0440\u0435\u0433\u0438\u0441\u0442\u0440\u043e\u0432 (CVE-2020-0548, VRS &#8212; Vector Register Sampling). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442\u043d\u043e\u0441\u044f\u0442\u0441\u044f \u043a \u043a\u043b\u0430\u0441\u0441\u0443 MDS (Microarchitectural Data Sampling) \u0438 \u043e\u0441\u043d\u043e\u0432\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c \u043a \u0434\u0430\u043d\u043d\u044b\u043c \u0432 \u043c\u0438\u043a\u0440\u043e\u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u044b\u0445 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430\u0445. AMD, [&hellip;]<\/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-55763","post","type-post","status-publish","format-standard","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 \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0430 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 CPU Intel, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u044b\u0445 \u0443\u0442\u0435\u0447\u043a\u043e\u0439 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u043a\u044d\u0448\u0430.\" \/>\n\t<meta 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