{"id":82556,"date":"2020-05-22T19:41:55","date_gmt":"2020-05-22T17:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc"},"modified":"2020-05-22T19:41:55","modified_gmt":"2020-05-22T17:41:55","slug":"kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc","title":{"rendered":"Kriitiline haavatavus memcpy funktsiooni rakenduses ARMv7 Glibc koostises.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Turvauuringute ekspert Cisco ettev\u00f5ttest avalikustas<\/a><\/noindex> \u00fcksikasjad haavatavusest<\/a><\/noindex> (CVE-2020-6096<\/a><\/noindex>) Glibc funktsiooni memcpy() rakenduses 32-bitisel ARMv7 platvormil. Probleem tuleneb parameetri negatiivsete v\u00e4\u00e4rtuste vale k\u00e4itlemise t\u00f5ttu, mis m\u00e4\u00e4rab kopeeritava ala suuruse, seoses assembleri optimeerimistega, mis manipuleerivad 32-bitiste allkirjastatud t\u00e4isarvudega. memcpy() kutsumine ARMv7 s\u00fcsteemides negatiivse suurusega p\u00f5hjustab vale v\u00e4\u00e4rtuste v\u00f5rdlemise ja kirjutamise v\u00e4ljaspool m\u00e4\u00e4ratud puhvri piire.<\/p>\n

Haavatavust saab \u00e4ra kasutada koodi t\u00e4itmiseks olukordades, kus r\u00fcndaja suudab organiseerida muutujate negatiivsete v\u00e4\u00e4rtuste genereerimise, mille kaudu edastatakse kopeeritavate andmete suurus (n\u00e4iteks l\u00e4hevad negatiivseks, kui edastatakse rohkem kui 2 GB andmeid, kuid r\u00fcnnaku k\u00e4igus, et viia bufri piirist \u00fcle, tuleb edastada v\u00e4hemalt 4 GB). Funktsiooni memcpy() kasutatakse laialdaselt rakendustes ning ARMv7 protsessorid on levinud autot\u00f6\u00f6stuses, mobiilses, t\u00f6\u00f6stuslikus, tarbijate, side- ja sisseehitatud seadmetes, mis v\u00f5ivad potentsiaalselt saada Bluetoothi, HD Radio\/DAB, USB, CAN buss, Wi-Fi ja muude v\u00e4liste andmeallikate (n\u00e4iteks v\u00f5ivad r\u00fcnnakuobjektideks olla v\u00f5rgus ligip\u00e4\u00e4setavad teenused ja rakendused, mis v\u00f5tavad sisendeid ilma suuruse piiranguteta) r\u00fcnnakute sihtm\u00e4rgiks.<\/p>\n

N\u00e4idisena tuuakse v\u00e4lja t\u00f6\u00f6 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 loomine r\u00fcnnakuks auto info- ja meelelahutuss\u00fcsteemide http-serverile, mis on ligip\u00e4\u00e4setav auto Wi-Fi v\u00f5rgu kaudu. Kolmas isik saab \u00e4ra kasutada serveris olevaid haavatavusi memcpy kaudu, edastades v\u00e4ga suure GET-p\u00e4ringu ning teenides endale root-juurdep\u00e4\u00e4su s\u00fcsteemile.<\/p>\n

\"Kriitiline<\/a><\/noindex><\/center><\/p>\n

32-bitistel x86 s\u00fcsteemidel probleem ei ilmne, kuna memcpy teostus selle arhitektuuri jaoks interpreteerib m\u00f5\u00f5tmuutuja \u00f5igesti kui m\u00e4rketa t\u00e4isarv suuruse t\u00fc\u00fcbiga size_t (asm keeles kirjutatud). rakenduste<\/a><\/noindex> ARMv7 puhul t\u00f6\u00f6deldakse seda signed integerina). Parandus on hetkel saadaval kujul, pat\u0161<\/a><\/noindex>mis kuulub augustis ilmuvasse Glibc 2.32 uuendusse.
\nParandus seisneb assembleri k\u00e4skude asendamises, mis t\u00f6\u00f6tavad m\u00e4rgiga operandide (bge ja blt) asemele m\u00e4rketa analoogidega (blo ja bhs). <\/p>\n

Probleem ei ole veel lahendatud Debian 9 ja 10<\/a><\/noindex> (Debian 8-s ei ilmne), Fedora<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, OpenEmbedded, Tizen (kasutatakse glibc). RHEL<\/a><\/noindex> ja SUSE<\/a><\/noindex> probleem ei m\u00f5juta, kuna nad ei toeta 32-bitiseid ARMv7 s\u00fcsteeme. Android ei ole haavatav, kuna kasutab oma libc (Bionic) rakendust. V OpenWRT<\/a><\/noindex> vaikimisi enamikus kooslustes kasutatakse Musli, kuid hoidlas on ka glibc.<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-82556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Kriitiline haavatavus memcpy funktsiooni rakenduses ARMv7 Glibc'is | ProHoster","description":"Cisco'i turvauuringute spetsialistid avaldasid 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