{"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\/da\/blog\/news\/predstavlen-novyj-klass-uyazvimostej-v-protsessorah-intel","title":{"rendered":"Pr\u00e6senteret er en ny klasse af s\u00e5rbarheder i Intel-processorer","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Intel <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/security-center\/advisory\/intel-sa-00233.html\">offentliggjorde<\/a><\/noindex> information om den nye <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">s\u00e5rbarhedsklasse<\/a><\/noindex> i deres processorer \u2013 <noindex><a rel=\"nofollow\" href=\"https:\/\/mdsattacks.com\/\">MDS<\/a><\/noindex> \uff08Microarchitectural Data Sampling\uff09. Ligesom tidligere angreb i Spectre-klassen kan de nye problemer f\u00f8re til l\u00e6kage af fortrolige data fra operativsystemet, virtuelle maskiner og andres processer. Det p\u00e5st\u00e5s, at problemerne f\u00f8rst blev opdaget af ansatte og partnere hos Intel under en intern revision, hvorefter informationen om lignende problemer hos Intel blev overdraget til uafh\u00e6ngige forskere. Processorer fra AMD og ARM er ikke p\u00e5virket af problemet.<\/p>\n<p>Baseret p\u00e5 de opdagede problemer har forskere fra Graz University of Technology (\u00d8strig) <noindex><a rel=\"nofollow\" href=\"https:\/\/cpu.fail\/\">udviklet<\/a><\/noindex> flere praktiske angreb via sidel\u00f8bende kanaler:<\/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>) \u2013 muligg\u00f8r udtr\u00e6kning af f\u00f8lsomme informationer fra andre processer, operativsystemet, virtuelle maskiner og beskyttede enclaves (TEE, Trusted Execution Environment). For eksempel er muligheden for at bestemme historien for \u00e5bning af sider i Tor-browseren, der k\u00f8rer i en anden virtuel maskine, blevet demonstreret, samt at bestemme de adgangsn\u00f8gler og adgangskoder, der anvendes i applikationer;\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>) \u2013 muligg\u00f8r organisering af informationsl\u00e6kager mellem forskellige isolerede omr\u00e5der i Intel-processorer, s\u00e5som bufferbeholdere, lagringsbuffere og indl\u00e6sning porte. Eksempler p\u00e5 angreb er vist for at organisere l\u00e6kager fra andre processer, operativsystemet, virtuelle maskiner og beskyttede enclaves. For eksempel er det vist, hvordan man kan finde indholdet af hash-koden til root-adgangskoden fra \/etc\/shadow ved hj\u00e6lp af periodiske autentificeringsfors\u00f8g (angrebet tog 24 timer);\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=\"Afspil video\" 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>Derudover er et eksempel p\u00e5 et angreb ved hj\u00e6lp af JavaScript og WebAssembly blevet vist, n\u00e5r en ondsindet side \u00e5bnes i SpiderMonkey-motoren (i moderne komplette browsere er et s\u00e5dant angreb usandsynligt p\u00e5 grund af begr\u00e6nsninger i timerens n\u00f8jagtighed og foranstaltninger til beskyttelse mod Spectre);<\/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=\"Afspil video\" 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>) \u2013 giver mulighed for at l\u00e6se data, der for nylig er blevet skrevet af operativsystemet, og bestemme OS-hukommelseslayoutet for at lette udf\u00f8relsen af andre angreb;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/cpu.fail\/store_to_leak_forwarding.pdf\">Store-To-Leak Forwarding<\/a><\/noindex> \u2013 udnytter CPU-optimeringer relateret til arbejdet med lagringsbuffere og kan anvendes til at omg\u00e5 mekanismen for randomisering af kernelens adressrum (KASLR), til overv\u00e5gning af operativsystemets tilstand eller til <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cyberus-technology.de\/posts\/2019-05-14-zombieload.html\">organisere<\/a><\/noindex> l\u00e6kager i kombination med gadgets baseret p\u00e5 Spectre-metoder.\n<\/ul>\n<p>Opdagede <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/software-guidance\/microarchitectural-data-sampling\">s\u00e5rbarheder<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\"> CVE-2018-12126 \u2013 MSBDS (Microarchitectural Store Buffer Data Sampling), gendannelse af indholdet af lagringsbuffere. Bruges i angrebet Fallout. Fareniveauet er bestemt til 6.5 po\u00e4ng (CVSS);\n<li class=\"l\"> CVE-2018-12127 \u2013 MLPDS (Microarchitectural Load Port Data Sampling), gendannelse af indholdet af indl\u00e6sningsporte. Bruges i angrebet RIDL. CVSS 6.5;\n<li class=\"l\"> CVE-2018-12130 \u2013 MFBDS (Microarchitectural Fill Buffer Data Sampling), gendannelse af indholdet af bufferbeholdere. Bruges i angrebene ZombieLoad og RIDL. CVSS 6.5;\n<li class=\"l\"> CVE-2019-11091 \u2013 MDSUM (Microarchitectural Data Sampling Uncacheable Memory), gendannelse af indholdet af ikke-cachet hukommelse. Bruges i angrebet RIDL. 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\">Essensen<\/a><\/noindex> Identificerede problemer med anvendelsen af analyseteknikker fra sidekanaler p\u00e5 data i mikroarkitektoniske strukturer, som applikationer ikke har direkte adgang til. Det drejer sig om s\u00e5danne lavniveau strukturer som udfyldningsbuffere (Line Fill Buffer), lagringsbuffere (Store Buffer) og indl\u00e6sningsporte (Load Port), som er mere grundl\u00e6ggende komponenter end f\u00f8rste niveau cache (L1D), hukommelsescache (RDCL) eller L1TF (L1 Terminal Fault), og som derfor indeholder f\u00e6rre oplysninger og opdateres mere intensivt.<br \/>\n<center><img decoding=\"async\" alt=\"Pr\u00e6senteret er en ny klasse af s\u00e5rbarheder i Intel-processorer\" src=\"\/wp-content\/uploads\/2019\/05\/205ff034e070b8b057f01c02d6381c2a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Angreb via sidekanaler p\u00e5 mikroarkitektoniske strukturer er betydeligt sv\u00e6rere at udf\u00f8re sammenlignet med metoder til genoprettelse af cacheindhold og kr\u00e6ver overv\u00e5gning og analyse af store m\u00e6ngder data for at bestemme deres forbindelse til specifikke adresser i hukommelsen (i det v\u00e6sentlige kan angriberen ikke m\u00e5lrette specifikke data, men kan i l\u00e6ngere tid akkumulere l\u00e6kager og anvende statistiske metoder til at rekonstruere bestemte datatyper). Desuden p\u00e5virker angrebet kun data p\u00e5 det samme fysiske CPU-kerne som angriberens kode.<\/p>\n<p>De foresl\u00e5ede metoder til identifikation af indholdet af mikroarkitektoniske strukturer er baseret p\u00e5, at disse strukturer anvendes under speculativ behandling af undtagelser (fejl) eller operationer load og store.<br \/>\nVed spekulativ udf\u00f8relse bliver indholdet af interne strukturer omdirigeret til behandling i registre eller cache. Speculative operationer afsluttes ikke, og resultatet kasseres, men det omdirigerede indhold kan identificeres ved hj\u00e6lp af metoder til sidekanal analyse af cache.<\/p>\n<p>Boot ports are used by the processor to retrieve data from memory or input\/output subsystems and provide the retrieved information to the CPU registers. Due to the implementation specifics, the data from older load operations remains in the ports until it is overwritten with new data, which allows for indirectly determining the data state in the load port through fault manipulations and SSE\/AVX\/AVX-512 instructions that load more than 64 bits of data. In such conditions, load operations speculatively expose outdated data values from internal structures into dependent operations. A similar leak occurs through the storage buffer, used to accelerate writing to the CPU cache and including a table of addresses, values, and flags, as well as through the fill buffer, which contains data not yet in the L1 cache (cache-miss) during loading from caches of other levels.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1557869220.png\"><img decoding=\"async\" alt=\"Pr\u00e6senteret er en ny klasse af s\u00e5rbarheder i Intel-processorer\" src=\"\/wp-content\/uploads\/2019\/05\/1f8bf290cd6ecbec5a5f17cc3103010d.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Problemet <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/engineering-new-protections-into-hardware.html\">affects<\/a><\/noindex> Intel processor models released since 2011 (starting from the 6th generation). Hardware vulnerabilities are blocked starting from some models of the 8th and 9th generations of Intel Core and the 2nd generation of Intel Xeon Scalable (this can be checked via the ARCH_CAP_MDS_NO bit in the IA32_ARCH_CAPABILITIES MSR). Vulnerabilities are also already <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">er blevet rettet<\/a><\/noindex> addressed at the firmware, microcode, and operating system levels. Intel estimates that the performance loss after activating patches for most users <noindex><a rel=\"nofollow\" href=\"https:\/\/www.intel.com\/content\/www\/us\/en\/architecture-and-technology\/mds.html\">does not exceed<\/a><\/noindex> 3%. When disabling Hyper-Threading, performance degradation can reach up to 9% in the SPECint_rate_base test, up to 11% during active integer calculations, and up to 19% when running server-side Java applications (with HT enabled, performance degradation is almost nonexistent). Patches have little impact on input\/output operation performance.<\/p>\n<p>In the Linux kernel, protection against MDS <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=fa4bff165070dc40a3de35b78e4f8da8e8d85ec5\">tilf\u00f8jet<\/a><\/noindex> is present in today's <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/\">updates<\/a><\/noindex>  \t5.1.2, 5.0.16,<br \/>\n4.19.43, 4.14.119, and 4.9.176. The protection method <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/html\/latest\/x86\/mds.html#mds\">is based<\/a><\/noindex> on clearing the contents of microarchitectural buffers when returning from kernel to user space or when transferring control to a guest system, using the VERW instruction. For the protection to work, support for the MD_CLEAR mode, implemented in the latest microcode update, is required. For complete protection, it is also advisable to disable Hyper-Threading. To verify system susceptibility to vulnerabilities in the Linux kernel. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/html\/latest\/admin-guide\/hw-vuln\/mds.html\">tilf\u00f8jet<\/a><\/noindex> behandler \u00ab\/sys\/devices\/system\/cpu\/vulnerabilities\/mds\u00bb. For at styre aktiveringen af forskellige blocking-niveauer for s\u00e5rbarheden er der tilf\u00f8jet parameteren \u00abmds=\u00bb, som kan tage v\u00e6rdierne \u00abfull\u00bb, \u00abfull,nosmt\u00bb (deaktivering af Hyper-Threads), \u00abvmwerv\u00bb og \u00aboff\u00bb.<\/p>\n<p> Pakkeforl\u00f8b er allerede udgivet for <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2018-12127\">RHEL<\/a><\/noindex> og <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2018\/CVE-2018-12127.html\">Ubuntu<\/a><\/noindex>, men er endnu ikke tilg\u00e6ngelige for <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> og <noindex><a rel=\"nofollow\" href=\"https:\/\/www.suse.com\/security\/cve\/CVE-2018-12127\/\">SUSE<\/a><\/noindex>.<br \/>\nL\u00f8sningen til at blokere datal\u00e6kager fra virtuelle maskiner ogs\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-297.html\">er designet<\/a><\/noindex> for hypervisoren Xen. For at beskytte virtualiseringssystemer, der udf\u00f8rer kommandoen L1D_FLUSH f\u00f8r kontrolen overg\u00e5r til en anden virtuel maskine, og for at beskytte Intel SGX enclave er det tilstr\u00e6kkeligt at opdatere mikrokoden.  <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <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 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" 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