{"id":108554,"date":"2023-05-17T00:48:11","date_gmt":"2023-05-16T22:48:11","guid":{"rendered":"https:\/\/prohoster.info\/?p=108554"},"modified":"2023-05-17T10:40:17","modified_gmt":"2023-05-17T08:40:17","slug":"ataka-pmfault-pozvolyayushhaya-vyvesti-iz-stroya-cpu-na-nekotoryh-servernyh-sistemah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/ataka-pmfault-pozvolyayushhaya-vyvesti-iz-stroya-cpu-na-nekotoryh-servernyh-sistemah","title":{"rendered":"A PMFault t\u00e1mad\u00e1s, amely bizonyos szerverrendszerek CPU-j\u00e1t k\u00e9pes le\u00e1ll\u00edtani.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A birmingham-i egyetem kutat\u00f3i, akik kor\u00e1bban a Plundervolt \u00e9s VoltPillager t\u00e1mad\u00e1sok kidolgoz\u00e1s\u00e1r\u00f3l voltak ismertek, egy sebezhet\u0151s\u00e9get (CVE-2022-43309) az egyes szerver alaplapokon, amely lehet\u0151v\u00e9 teszi a CPU fizikai meghib\u00e1sod\u00e1s\u00e1t helyre\u00e1ll\u00edt\u00e1si lehet\u0151s\u00e9g n\u00e9lk\u00fcl. A PMFault k\u00f3dn\u00e9vvel ell\u00e1tott sebezhet\u0151s\u00e9g haszn\u00e1lhat\u00f3 olyan szerverek k\u00e1ros\u00edt\u00e1s\u00e1ra is, amelyekhez a t\u00e1mad\u00f3nak nincs fizikai hozz\u00e1f\u00e9r\u00e9se, de van privilegiz\u00e1lt hozz\u00e1f\u00e9r\u00e9se az oper\u00e1ci\u00f3s rendszerhez, p\u00e9ld\u00e1ul egy jav\u00edtatlan sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1val vagy az adminisztr\u00e1tor hiteles\u00edt\u0151 adatainak megszerz\u00e9s\u00e9vel.       <\/p>\n<p>A javasolt m\u00f3dszer l\u00e9nyege a PMBus interf\u00e9sz haszn\u00e1lata, amelyben az I2C protokoll alkalmaz\u00e1sra ker\u00fcl, a processzorra juttatott fesz\u00fclts\u00e9g megn\u00f6vel\u00e9s\u00e9re, amely chip s\u00e9r\u00fcl\u00e9st okoz. A PMBus interf\u00e9szt jellemz\u0151en a VRM (Fesz\u00fclts\u00e9g Szab\u00e1lyz\u00f3 Modul) modulban val\u00f3s\u00edtj\u00e1k meg, amelyhez hozz\u00e1f\u00e9r\u00e9st lehet kapni a BMC-vez\u00e9rl\u0151 manipul\u00e1l\u00e1s\u00e1val. A PMBus-t t\u00e1mogat\u00f3 alaplapok t\u00e1mad\u00e1s\u00e1hoz az oper\u00e1ci\u00f3s rendszerben adminisztr\u00e1tori jogok mellett sz\u00fcks\u00e9ges a BMC-hez (Alaplapi Kezel\u0151 Egys\u00e9g) val\u00f3 programozott hozz\u00e1f\u00e9r\u00e9s is, p\u00e9ld\u00e1ul az IPMI KCS (Billenty\u0171zet-vez\u00e9rl\u0151 St\u00edlus) interf\u00e9szen, Etherneten kereszt\u00fcl, vagy a BMC \u00fajraprogramoz\u00e1s\u00e1val a jelenlegi rendszeren kereszt\u00fcl.      <\/p>\n<p>A BMC hiteles\u00edt\u00e9si param\u00e9tereinek ismerete n\u00e9lk\u00fcli t\u00e1mad\u00e1st lehet\u0151v\u00e9 t\u00e9v\u0151 probl\u00e9m\u00e1t a Supermicro IPMI (X11, X12, H11 \u00e9s H12) t\u00e1mogat\u00e1s\u00fa alaplapjain \u00e9s az ASRock alaplapjain is meger\u0151s\u00edtett\u00e9k, de m\u00e1s szerverlapok is sebezhet\u0151k, amelyekhez hozz\u00e1f\u00e9rhet\u0151 a PMBus. A v\u00e9gzett k\u00eds\u00e9rletek sor\u00e1n ezekre az alaplapokra 2,84 voltos fesz\u00fclts\u00e9g emel\u00e9sekor k\u00e9t Intel Xeon processzor s\u00e9r\u00fclt meg. A BMC-hez val\u00f3 hozz\u00e1f\u00e9r\u00e9shez, an\u00e9lk\u00fcl, hogy ismern\u00e9nk a hiteles\u00edt\u00e9si param\u00e9tereket, de a rendszer oper\u00e1ci\u00f3s szint\u0171 root-jogosults\u00e1gaival, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get haszn\u00e1ltak a firmware-verifik\u00e1ci\u00f3s mechanizmusban, amely lehet\u0151v\u00e9 tette a m\u00f3dos\u00edtott firmware-friss\u00edt\u00e9s bet\u00f6lt\u00e9s\u00e9t a BMC-vez\u00e9rl\u0151be, valamint a hiteles\u00edt\u00e9st nem ig\u00e9nyl\u0151 hozz\u00e1f\u00e9r\u00e9st az IPMI KCS-en kereszt\u00fcl.     <\/p>\n<p>A fesz\u00fclts\u00e9g PMBus-on kereszt\u00fcli m\u00f3dos\u00edt\u00e1s\u00e1nak m\u00f3dszere alkalmazhat\u00f3 a Plundervolt t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1ra is, amely lehet\u0151v\u00e9 teszi, hogy a fesz\u00fclts\u00e9g minim\u00e1lis \u00e9rt\u00e9kekre cs\u00f6kkent\u00e9s\u00e9vel k\u00e1ros\u00edtsa a CPU adatokkal foglalkoz\u00f3 cell\u00e1it az Intel SGX elszigetelt k\u00f6rnyezet\u00e9ben, \u00e9s hib\u00e1kat okozzon kezdetben helyes algoritmusokban. P\u00e9ld\u00e1ul, ha siker\u00fcl v\u00e1ltoztatni a titkos\u00edt\u00e1s sor\u00e1n haszn\u00e1lt szorz\u00f3 \u00e9rt\u00e9k\u00e9n, a kimenet helytelen titkos\u00edt\u00e1st ad. Ha a t\u00e1mad\u00f3 hozz\u00e1f\u00e9r az SGX k\u00f3dol\u00f3 kezel\u0151j\u00e9hez a saj\u00e1t adatai titkos\u00edt\u00e1s\u00e1hoz, a hib\u00e1k gener\u00e1l\u00e1s\u00e1val statisztik\u00e1t halmozhat fel a kimeneti titkos\u00edt\u00e1sban bek\u00f6vetkez\u0151 v\u00e1ltoz\u00e1sokr\u00f3l, \u00e9s \u00edgy vissza\u00e1ll\u00edthatja az SGX k\u00f6rnyezetben t\u00e1rolt kulcs \u00e9rt\u00e9k\u00e9t.    <\/p>\n<p>A Supermicro \u00e9s ASRock alaplapok ellen\u00e1ll\u00e1s\u00e1nak tesztel\u00e9s\u00e9re alkalmas eszk\u00f6z, valamint a PMBus-hoz val\u00f3 hozz\u00e1f\u00e9r\u00e9s ellen\u0151rz\u00e9s\u00e9re szolg\u00e1l\u00f3 utilit\u00e1s is el\u00e9rhet\u0151 a GitHub-on.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=59136\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0411\u0438\u0440\u043c\u0438\u043d\u0433\u0435\u043c\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430, \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0435 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0430\u0442\u0430\u043a Plundervolt \u0438 VoltPillager, \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-43309) \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u043d\u0441\u043a\u0438\u0445 \u043f\u043b\u0430\u0442\u0430\u0445, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0438\u0437 \u0441\u0442\u0440\u043e\u044f CPU \u0431\u0435\u0437 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0435\u0433\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0433\u043e \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f PMFault, \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432, \u043a \u043a\u043e\u0442\u043e\u0440\u044b\u043c \u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u0433\u043e \u043d\u0435\u0442 \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u0430, \u043d\u043e \u0435\u0441\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 [&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-108554","post","type-post","status-publish","format-standard","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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property=\"article:modified_time\" content=\"2023-05-17T08:40:17+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47 A PMFault t\u00e1mad\u00e1s, amely k\u00e9pes t\u00f6nkretenni a CPU-t egyes szerver rendszereken | ProHoster","description":"A Birmingham-i Egyetem kutat\u00f3i, akik a Plundervolt \u00e9s a VoltPillager t\u00e1mad\u00e1sok fejleszt\u00e9s\u00e9r\u0151l ismertek, felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2022-43309) egyes szerver alaplapokban, amely lehet\u0151v\u00e9 teszi a fizikai elt\u00e1vol\u00edt\u00e1st.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/ataka-pmfault-pozvolyayushhaya-vyvesti-iz-stroya-cpu-na-nekotoryh-servernyh-sistemah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0410\u0442\u0430\u043a\u0430 PMFault, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0438\u0437 \u0441\u0442\u0440\u043e\u044f CPU \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0411\u0438\u0440\u043c\u0438\u043d\u0433\u0435\u043c\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430, \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0435 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0430\u0442\u0430\u043a Plundervolt \u0438 VoltPillager, \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-43309) \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u043d\u0441\u043a\u0438\u0445 \u043f\u043b\u0430\u0442\u0430\u0445, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438 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