{"id":114581,"date":"2024-03-26T12:25:42","date_gmt":"2024-03-26T10:25:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/zenhammer-metod-ataki-dlya-iskazheniya-soderzhimogo-pamyati-na-platformah-amd-zen"},"modified":"2024-03-26T12:25:42","modified_gmt":"2024-03-26T10:25:43","slug":"zenhammer-metod-ataki-dlya-iskazheniya-soderzhimogo-pamyati-na-platformah-amd-zen","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/zenhammer-metod-ataki-dlya-iskazheniya-soderzhimogo-pamyati-na-platformah-amd-zen","title":{"rendered":"ZenHammer \u2014 t\u00e1mad\u00e1si m\u00f3dszer az AMD Zen platformokon a mem\u00f3ria tartalm\u00e1nak torz\u00edt\u00e1s\u00e1ra","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A sv\u00e1jci Z\u00fcrichi M\u0171szaki Egyetem kutat\u00f3i kifejlesztettek egy ZenHammer t\u00e1mad\u00e1si m\u00f3dszert, amely a RowHammer t\u00edpus\u00fa t\u00e1mad\u00e1sok egyik v\u00e1ltozata a dinamikus RAM (DRAM) egyes biteinek tartalm\u00e1nak megv\u00e1ltoztat\u00e1s\u00e1ra, \u00e9s alkalmas az AMD processzorokkal rendelkez\u0151 platformokon val\u00f3 haszn\u00e1latra. A kor\u00e1bbi RowHammer t\u00e1mad\u00e1si m\u00f3dszerek Intel alap\u00fa rendszerekre korl\u00e1toz\u00f3dtak, de a v\u00e9gzett kutat\u00e1s azt mutatta, hogy mem\u00f3ria cell\u00e1k torzul\u00e1sa az AMD mem\u00f3ria vez\u00e9rl\u0151kkel rendelkez\u0151 platformokon is el\u00e9rhet\u0151. <\/p>\n

A m\u00f3dszer alkalmaz\u00e1s\u00e1t bemutatt\u00e1k az AMD Zen 2 \u00e9s Zen 3 rendszereken h\u00e1rom vezet\u0151 gy\u00e1rt\u00f3 (Samsung, Micron \u00e9s SK Hynix) DDR4 mem\u00f3ria moduljaival. A t\u00e1mad\u00e1s sikeresen megker\u00fcli a mem\u00f3ri\u00e1ban tal\u00e1lhat\u00f3 TRR (Target Row Refresh) mechanizmust, amely a szomsz\u00e9dos sorokban l\u00e9v\u0151 mem\u00f3ria cell\u00e1k torzul\u00e1sa ellen v\u00e9den\u00e9 a chipet. A kutat\u00f3k szerint az AMD Zen 3 CPU alap\u00fa rendszerek sebezhet\u0151s\u00e9ge nagyobb, mint az Intel Coffee Lake processzorral rendelkez\u0151 rendszerek\u00e9, \u00e9s ezek t\u00e1mad\u00e1sa egyszer\u0171bb \u00e9s hat\u00e9konyabb. Az AMD Zen 2 rendszereken 10 tesztelt DDR4 chipb\u0151l 7-en siker\u00fclt cellatorzul\u00e1st el\u00e9rni, m\u00edg a Zen 3 rendszereken 6-b\u00f3l siker\u00fclt. A kutat\u00f3k azt is elemezt\u00e9k, hogy lehets\u00e9ges-e t\u00e1madni az AMD Zen 4 rendszereket DDR5 mem\u00f3ri\u00e1val, de a DDR4-re kifejlesztett t\u00e1mad\u00e1si m\u00f3dszert csak 1-b\u0151l 10 tesztelt DDR5 chipen siker\u00fclt reproduk\u00e1lni, \u00e9s b\u00e1r a t\u00e1mad\u00e1s lehet\u0151s\u00e9ge nem z\u00e1rhat\u00f3 ki, fejlettebb olvas\u00e1si mint\u00e1k kidolgoz\u00e1s\u00e1t ig\u00e9nyli, amelyek megfelelnek a DDR5 eszk\u00f6z\u00f6knek. <\/p>\n

Az AMD chipekkel val\u00f3 munk\u00e1hoz siker\u00fclt adapt\u00e1lni a kor\u00e1bban kifejlesztett exploitokat, amelyek megv\u00e1ltoztatj\u00e1k a mem\u00f3riaoldalak bejegyz\u00e9seinek tartalm\u00e1t (PTE, page table entry), hogy kernel jogokat szerezzenek, megker\u00fclve a jelsz\u00f3 \/ jogosults\u00e1g ellen\u0151rz\u00e9s\u00e9t a folyamat mem\u00f3ria m\u00f3dos\u00edt\u00e1s\u00e1val, \u00e9s megs\u00e9rti az OpenSSH-ban t\u00e1rolt RSA-2048 nyilv\u00e1nos kulcsot a z\u00e1r kulcs \u00fajb\u00f3li l\u00e9trehoz\u00e1s\u00e1hoz. A mem\u00f3riaoldalak elleni t\u00e1mad\u00e1st 10 tesztelt DDR4 chipb\u0151l 7 eset\u00e9ben siker\u00fclt reproduk\u00e1lni, m\u00edg az RSA kulcs elleni t\u00e1mad\u00e1st 6 chipn\u00e9l, a sudo elleni t\u00e1mad\u00e1st pedig 4 chipn\u00e9l hajtott\u00e1k v\u00e9gre, az attack id\u0151tartama pedig 164, 267 \u00e9s 209 m\u00e1sodperc volt.

\"ZenHammer<\/center> <\/p>\n

A m\u00f3dszer alkalmazhat\u00f3 a rendszer b\u00f6ng\u00e9sz\u0151k\u00f6n kereszt\u00fcli t\u00e1mad\u00e1s\u00e1ra is, hogy v\u00e1ltoztat\u00e1sokat eszk\u00f6z\u00f6ljenek a virtu\u00e1lis g\u00e9pekhez<\/a> vagy a h\u00e1l\u00f3zati t\u00e1mad\u00e1s megszervez\u00e9s\u00e9hez. A GitHub-on, MIT licenc alatt, el\u00e9rhet\u0151 a DARE eszk\u00f6zk\u00e9szlet forr\u00e1sk\u00f3dja a DRAM mem\u00f3ria c\u00edmz\u00e9s\u00e9nek visszafejt\u00e9s\u00e9re, valamint k\u00e9t sorozat hasznos seg\u00e9dprogram a mem\u00f3ria bitkorrupts\u00e1g\u00e1nak fuzzing tesztel\u00e9s\u00e9re - ddr4_zen2_zen3_pub DDR4 chipekhez (Zen 2 \u00e9s Zen 3) \u00e9s ddr5_zen4_pub DDR5 chipekhez (Zen 4), amelyeket saj\u00e1t rendszereik t\u00e1mad\u00e1sokra val\u00f3 \u00e9rz\u00e9kenys\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9re haszn\u00e1lhatnak.

\"ZenHammer<\/center> <\/p>\n

A bitek torz\u00edt\u00e1s\u00e1hoz RowHammer m\u00f3dszert alkalmaznak, amely azon alapul, hogy a DRAM mem\u00f3ri\u00e1ban, amely egy k\u00e9tdimenzi\u00f3s cella m\u00e1trix, kondenz\u00e1torb\u00f3l \u00e9s tranzisztorb\u00f3l \u00e1ll, egyazon mem\u00f3ria ter\u00fclet folyamatos olvas\u00e1sa fesz\u00fclts\u00e9gingadoz\u00e1st \u00e9s anom\u00e1li\u00e1kat okoz, ami a szomsz\u00e9dos cell\u00e1k kis mennyis\u00e9g\u0171 t\u00f6lt\u00e9sveszt\u00e9s\u00e9hez vezet. Ha az olvas\u00e1si intenzit\u00e1s nagy, a szomsz\u00e9dos cella elegend\u0151 t\u00f6lt\u00e9st vesz\u00edthet, \u00e9s a k\u00f6vetkez\u0151 regener\u00e1ci\u00f3s ciklus nem k\u00e9pes vissza\u00e1ll\u00edtani az eredeti \u00e1llapot\u00e1t, aminek k\u00f6vetkezt\u00e9ben megv\u00e1ltozik a cell\u00e1ban t\u00e1rolt adatok \u00e9rt\u00e9ke. A kutat\u00f3 felfedezte az AMD processzorokban alkalmazott fizikai mem\u00f3ria lek\u00e9pez\u00e9si \u00e9s mem\u00f3riafriss\u00edt\u00e9si szinkroniz\u00e1l\u00e1si mechanizmusok saj\u00e1toss\u00e1gait, amelyek lehet\u0151v\u00e9 tett\u00e9k a DRAM alacsony szint\u0171 c\u00edmz\u00e9s\u00e9nek rekonstrukci\u00f3j\u00e1t, a szomsz\u00e9dos cell\u00e1k c\u00edm\u00e9nek meghat\u00e1roz\u00e1s\u00e1t, a gyors\u00edt\u00f3t\u00e1raz\u00e1s megker\u00fcl\u00e9s\u00e9nek m\u00f3dszereit, valamint a t\u00f6lt\u00e9sveszt\u00e9shez vezet\u0151 m\u0171veletek mint\u00e1inak \u00e9s gyakoris\u00e1g\u00e1nak kisz\u00e1m\u00edt\u00e1s\u00e1t. <\/p>\n

A RowHammer t\u00e1mad\u00e1sokkal szembeni v\u00e9dekez\u00e9s \u00e9rdek\u00e9ben a chipgy\u00e1rt\u00f3k TRR (Target Row Refresh) mechanizmust alkalmaznak, amely blokkolja a cell\u00e1k torz\u00edt\u00e1s\u00e1t egyes esetekben, de nem v\u00e9d minden lehets\u00e9ges t\u00e1mad\u00e1si forma ellen. A legsz\u00e9lesebb k\u00f6rben hat\u00e9kony v\u00e9dekez\u00e9si m\u00f3dszer a hibajav\u00edt\u00f3 k\u00f3dokkal (ECC) rendelkez\u0151 mem\u00f3ria haszn\u00e1lata, amelyek jelent\u0151sen megnehez\u00edtik, de nem z\u00e1rj\u00e1k ki teljesen a RowHammer t\u00edpus\u00fa t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1s\u00e1t. A mem\u00f3ria regener\u00e1ci\u00f3s gyakoris\u00e1g\u00e1nak n\u00f6vel\u00e9se szint\u00e9n cs\u00f6kkenti a sikeres t\u00e1mad\u00e1s val\u00f3sz\u00edn\u0171s\u00e9g\u00e9t. <\/p>\n

Az AMD k\u00f6zz\u00e9tette a probl\u00e9m\u00e1val kapcsolatos jelent\u00e9s\u00e9t, amelyben kifejti, hogy az AMD processzorok mem\u00f3riavez\u00e9rl\u0151ket alkalmaznak, amelyek megfelelnek a DDR el\u0151\u00edr\u00e1soknak, \u00e9s mivel a t\u00e1mad\u00e1s sikeress\u00e9ge els\u0151sorban a rendszer \u00e9s a DRAM mem\u00f3ria be\u00e1ll\u00edt\u00e1sait\u00f3l f\u00fcgg, a probl\u00e9m\u00e1k megold\u00e1s\u00e1val kapcsolatban a mem\u00f3ria- \u00e9s rendszergy\u00e1rt\u00f3khoz kell fordulni. A Rowhammer t\u00edpus\u00fa t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1s\u00e1nak nehez\u00edt\u00e9s\u00e9re megl\u00e9v\u0151 m\u00f3dszerek k\u00f6z\u00e9 tartozik az ECC mem\u00f3ria haszn\u00e1lata, a mem\u00f3ria regener\u00e1ci\u00f3s frekvencia n\u00f6vel\u00e9se, a k\u00e9sleltetett regener\u00e1ci\u00f3s m\u00f3d kikapcsol\u00e1sa \u00e9s olyan processzorok haszn\u00e1lata, amelyek t\u00e1mogatj\u00e1k a MAC (Maximum Activate Count) m\u00f3dot a DDR4-hez (1., 2. \u00e9s 3. gener\u00e1ci\u00f3s AMD EPYC 'Naple', 'Rome' \u00e9s 'Milan') valamint az RFM (Refresh Management) m\u00f3dot a DDR5-h\u00f6z (4. gener\u00e1ci\u00f3s AMD EPYC).
\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 \u0428\u0432\u0435\u0439\u0446\u0430\u0440\u0441\u043a\u043e\u0439 \u0432\u044b\u0441\u0448\u0435\u0439 \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0448\u043a\u043e\u043b\u044b \u0426\u044e\u0440\u0438\u0445\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 ZenHammer, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0431\u043e\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 RowHammer \u0434\u043b\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (DRAM), \u0430\u0434\u0430\u043f\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u0445 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 AMD. \u041f\u0440\u043e\u0448\u043b\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 RowHammer \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u043b\u0438\u0441\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 Intel, \u043d\u043e \u043f\u0440\u043e\u0432\u0435\u0434\u0451\u043d\u043d\u043e\u0435 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e, \u0447\u0442\u043e \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u044f \u044f\u0447\u0435\u0435\u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u0442\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u043d\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114582,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114581","post","type-post","status-publish","format-standard","has-post-thumbnail","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 ZenHammer \u2014 t\u00e1mad\u00e1si m\u00f3dszer az AMD Zen platformok mem\u00f3riatartalm\u00e1nak megv\u00e1ltoztat\u00e1s\u00e1ra | ProHoster","description":"A Z\u00fcrichi M\u0171szaki Egyetem kutat\u00f3i kidolgoztak egy ZenHammer nev\u0171 t\u00e1mad\u00e1si m\u00f3dszert, amely a RowHammer t\u00edpus\u00fa t\u00e1mad\u00e1sok egy vari\u00e1ci\u00f3ja, amely lehet\u0151v\u00e9 teszi egyes bitek tartalm\u00e1nak megv\u00e1ltoztat\u00e1s\u00e1t a dinamikus RAM-ban.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/zenhammer-metod-ataki-dlya-iskazheniya-soderzhimogo-pamyati-na-platformah-amd-zen","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 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