{"id":94705,"date":"2020-09-20T07:42:30","date_gmt":"2020-09-20T05:42:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/organizacziya-effektivnyh-atak-po-vremeni-s-pomoshhyu-http-2-i-wpa3"},"modified":"2020-09-20T07:42:30","modified_gmt":"2020-09-20T05:42:30","slug":"organizacziya-effektivnyh-atak-po-vremeni-s-pomoshhyu-http-2-i-wpa3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/organizacziya-effektivnyh-atak-po-vremeni-s-pomoshhyu-http-2-i-wpa3","title":{"rendered":"Aja t\u00f5husate r\u00fcnnakute korraldamine HTTP\/2 ja WPA3 abil","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Uus r\u00fcnnaku meetod \u00fcletab v\u00f5rgu 'jitter' probleemid, mis v\u00f5ivad m\u00f5jutada r\u00fcnnakute edukust kolmandate osapoolte kanalitel.<\/p>\n<p><img decoding=\"async\" alt=\"Aja t\u00f5husate r\u00fcnnakute korraldamine HTTP\/2 ja WPA3 abil\" src=\"\/wp-content\/uploads\/2020\/09\/c79026eedd1d4411c1c0f49b41acabc9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUus meetod, mille on v\u00e4lja t\u00f6\u00f6tanud Leuven University (Belgia) ja New York University Abu Dhabis, on n\u00e4idanud, et kurjategijad v\u00f5ivad kasutada v\u00f5rgu protokollide omadusi, et korraldada konfidentsiaalse teabe lekkimist.<\/p>\n<p>See meetod, mille nimetus on <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/conference\/usenixsecurity20\/presentation\/van-goethem\">Ajatu ajamise r\u00fcnnakud<\/a><\/noindex>, mis esitati sel aastal Usenixi konverentsil, kasutab v\u00f5rgu protokollide kaudu samal ajal toimuvate p\u00e4ringute t\u00f6\u00f6tlemise erip\u00e4ra, et k\u00f5rvaldada \u00fcks probleemidest kaugjuhtimisr\u00fcnnakutes ajap\u00f5histel kolmandate osapoolte kanalitel.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Kaugjuhtimisr\u00fcnnakute ajaprobleemid<\/h3>\n<p>\nAjap\u00f5histe r\u00fcnnakute korral m\u00f5\u00f5davad kurjategijad k\u00e4ivitusaja erinevusi erinevate k\u00e4skude t\u00e4itmisel, p\u00fc\u00fcdes \u00fcletada kr\u00fcptimisega tagatud kaitset ja hankida konfidentsiaalsete andmete, nagu kr\u00fcptimisv\u00f5tmed, isiklikud vestlused ja kasutajate k\u00e4itumine veebi sirvimisel, teavet.<\/p>\n<p>Kuid ajar\u00fcnnaku eduka l\u00e4biviimise jaoks on r\u00fcndajal vajalik t\u00e4pne teadlikkus ajast, mis vajalik r\u00fcnnatava rakenduse p\u00e4ringu t\u00f6\u00f6tlemiseks.<\/p>\n<p>See muutub probleemiks, kui r\u00fcnnatakse selliseid kaug s\u00fcsteeme nagu veebiserverid, sest v\u00f5rgu viivitus (jitter) toob kaasa vastusaegade varieerumise, mis muudab t\u00f6\u00f6tlemise aja arvutamise keeruliseks.<\/p>\n<p>Kaugjuhtimisr\u00fcnnakute puhul saadavad r\u00fcndajad tavaliselt iga k\u00e4su mitu korda ja teevad vastusaegade statistilist anal\u00fc\u00fcsi, et v\u00e4hendada v\u00f5rgu jitteri m\u00f5ju. Kuid see meetod on kasulik vaid teatud m\u00e4\u00e4ral.<\/p>\n<p>\"Mida v\u00e4iksem on ajavahe, seda rohkem p\u00e4ringuid on vaja ning teatud etapil muutub arvutamine v\u00f5imatuks,\" r\u00e4\u00e4kis meile andmekaitses\u00fcsteemide uurija ja uue r\u00fcnnaku t\u00fc\u00fcbi peamine autor Tom Van G\u00f6tsem.<\/p>\n<h3>\"Ajast s\u00f5ltumatu\" ajar\u00fcnnak<\/h3>\n<p>\nG\u00f6tsemi ja tema kolleegide v\u00e4lja t\u00f6\u00f6tatud meetod viib kaugjuhtimisr\u00fcnnakud l\u00e4bi viisil, mis k\u00f5rvaldab v\u00f5rgu jitteri m\u00f5ju.<\/p>\n<p>Ajast s\u00f5ltumatu ajar\u00fcnnaku alusp\u00f5him\u00f5te on lihtne: tuleb tagada, et p\u00e4ringud j\u00f5uavad serverisse t\u00e4pselt samal ajal, mitte j\u00e4rjestikku.<\/p>\n<p>Samaajasus tagab, et k\u00f5ik p\u00e4ringud toimuvad v\u00f5rgu samaaegsetes tingimustes ning et nende t\u00f6\u00f6tlemist ei m\u00f5juta r\u00fcnnakulise ja serveri vahel olev tee. Vastuste saamise j\u00e4rjekord annab r\u00fcndajale kogu vajaliku teabe, et v\u00f5rrelda t\u00e4itmisaja erinevusi.<\/p>\n<p>\u201eAja s\u00f5ltumatute r\u00fcnnakute peamine eelis on see, et need on palju t\u00e4psemad, seet\u00f5ttu on vaja v\u00e4hem p\u00e4ringuid. See v\u00f5imaldab r\u00fcndajal eristada t\u00e4itmise ajalisi erinevusi kuni 100 ns\u201d, \u00fctleb Van Goetem.<\/p>\n<p>Minimum ajavahe, mida uurijad on t\u00e4hele pannud traditsiooniliselt ajar\u00fcnnakute korral Internetis, oli 10 \u00b5s, mis on 100 korda rohkem kui samaaegsete p\u00e4ringute r\u00fcnnakute korral.<\/p>\n<h3>Kuidas tagatakse samaajasus<\/h3>\n<p>\n\u201eSamaajasuse saavutame, paigutades m\u00f5lemad p\u00e4ringud \u00fchte v\u00f5rgu paketti,\u201d selgitab Van Goetem. \u201ePraktiliselt s\u00f5ltub rakendus peamiselt v\u00f5rguprotokollist.\u201d<\/p>\n<p>Samaaja p\u00e4ringute saatmiseks kasutavad uurijad erinevate v\u00f5rguprotokollide v\u00f5imalusi.<\/p>\n<p>N\u00e4iteks HTTP\/2, mis kiiresti muutub veebiserverite de facto standardiks, toetab \u201ep\u00e4ringute multiplexerimist\u201d - funktsiooni, mis v\u00f5imaldab kliendil saata \u00fche TCP-\u00fchenduse kaudu mitu p\u00e4ringut samaaegselt.<\/p>\n<p>\u201eHTTP\/2 korral peame lihtsalt tagama, et m\u00f5lemad p\u00e4ringud paigutataks \u00fchte paketti (n\u00e4iteks kirjutades m\u00f5lemad soketisse samaaegselt).\u201d Siiski on sellisel meetodil oma n\u00fcansid. N\u00e4iteks enamik sisuhaldusteenuseid, nagu Cloudflare, kellelt suurem osa veebisisust tuleb, teostab \u00fchendust piiripunktide serverite ja saidi vahel HTTP\/1.1 protokolliga, mis ei toeta p\u00e4ringute multiplexerimist.<\/p>\n<p>Kuigi see v\u00e4hendab aja r\u00fcnnaku efektiivsust, j\u00e4\u00e4vad need siiski t\u00e4psemaks kui klassikalised kaugr\u00fcnnakud ajale, kuna need elimineerivad jitteri r\u00fcndaja ja piiripunkti CDN-serveri vahel.<\/p>\n<p>Protokollide puhul, mis ei toeta p\u00e4ringute multiplexerimist, saavad r\u00fcndajad kasutada vahendavat v\u00f5rgu protokolli, mis kapseldab p\u00e4ringud.<\/p>\n<p>Uurijad n\u00e4itasid, kuidas ajar\u00fcnnak t\u00f6\u00f6tab Tor-v\u00f5rgus. Sel juhul kapseldab r\u00fcndaja mitmed p\u00e4ringud Tor'i s\u00f5lmes - kr\u00fcpteeritud pakett, mida edastatakse Tor'i v\u00f5rgu s\u00f5lmede vahel \u00fchesugustes TCP-pakettides.<\/p>\n<p>\u201eKuna Tor-ahel onion-teenuste jaoks juhib kogu tee serverisse, saame garanteerida, et p\u00e4ringud j\u00f5uavad kohale samal ajal,\u201c \u00fctleb Van Goetem.<\/p>\n<h3>Ajar\u00fcnnakud praktikas<\/h3>\n<p>\nOma artiklis uurisid teadlased ajar\u00fcnnakute toimumist kolmes erinevas olukorras.<\/p>\n<p>Kaugjuhtimisega <b>otseses ajar\u00fcnnakud<\/b> r\u00fcndaja \u00fchendub otse serveriga ja \u00fcritab korraldada salajase teabe leket, mis on seotud rakendusega.<\/p>\n<p>\u201eKuna enamik veebirakendusi ei arvesta, et ajar\u00fcnnakud v\u00f5ivad olla v\u00e4ga praktilised ja t\u00e4psed, usume, et paljud veebisaidid on selliste r\u00fcnnakute suhtes haavatavad,\u201c \u00fctleb Van Goetem.<\/p>\n<p>Kaugjuhtimisega <b>ristveebir\u00fcnnakud<\/b> r\u00fcndaja saadab p\u00e4ringud teistel veebisaitidel ohvri brauserist ja teeb oletusi konfidentsiaalse teabe sisu kohta, j\u00e4lgides vastuste j\u00e4rjekorda.<\/p>\n<p>R\u00fcndajad kasutasid seda skeemi HackerOne'i veateate preemiate programmi haavatavuse \u00e4rakasutamiseks ja hankisid teavet, nagu salajastes aruanetes kasutatud m\u00e4rks\u00f5nad, mis k\u00e4sitlevad lahendamata haavatavusi.<\/p>\n<p>\u201eOtsisin juhtumeid, kus ajar\u00fcnnakut oli varem registreeritud, kuid see ei olnud efektiivne. HackerOne'i vea kohta on teatatud v\u00e4hemalt kolm korda (vead: <noindex><a rel=\"nofollow\" href=\"https:\/\/hackerone.com\/reports\/350432\">350432<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/hackerone.com\/reports\/348168\">348168<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/hackerone.com\/reports\/4701\">4701<\/a><\/noindex>), kuid seda ei k\u00f5rvaldatud, kuna arvati, et seda r\u00fcnnakut ei saa \u00e4ra kasutada. Seej\u00e4rel l\u00f5in lihtsa sisemise teadusprojekti ajar\u00fcnnakute kohta.<\/p>\n<p>Sel ajal j\u00e4i see endiselt v\u00e4ga mitteoptimeeritud, kuna me j\u00e4tkasime r\u00fcnnaku \u00fcksikasjade m\u00f5istmist, kuid siiski oli see \u00fcsna t\u00e4pne (minu kodu WiFi-\u00fchenduses sain v\u00e4ga t\u00e4pseid tulemusi).<\/p>\n<p>Uurijad proovisin ka l\u00e4bi viia <b>ajav\u00e4lised r\u00fcnnakud WiFi-protokollile WPA3<\/b>.<\/p>\n<p>\u00dcks artikli kaasautoritest Mati Vanhoef oli varem avastanud <noindex><a rel=\"nofollow\" href=\"https:\/\/wpa3.mathyvanhoef.com\/\">potentsiaalse ajaleket WPA3 \u00fchenduse t\u00f5endamise protokollis.<\/a><\/noindex>Kuid aeg oli kas liiga l\u00fchike, et kasutada seda k\u00f5rgtehnoloogilistes seadmetes, v\u00f5i seda ei saanud kasutada serverite vastu.<\/p>\n<p>\u201eUue aja p\u00f5hjal p\u00f5hinevate ajar\u00fcnnakute abil n\u00e4itasime, et autentimise \u00fchenduse (EAP-pwd) v\u00f5ib tegelikult serverite vastu kasutada, isegi kui need t\u00f6\u00f6tavad v\u00f5imsa riistvaraga,\u201c selgitab Van Ghetem.<\/p>\n<h3>Ideaalne hetk<\/h3>\n<p>\nOma artiklis pakkusid teadlased soovitusi serverite kaitsmiseks ajar\u00fcnnakute eest, n\u00e4iteks pideva ajaga t\u00e4itmise piiramine ja juhuslikku viivituse lisamine. T\u00f5husate kaitsevahendite rakendamiseks ajar\u00fcnnakute vastu, mis m\u00f5jutavad v\u00f5rgu toimimist minimaalselt, on vajalikud edasised uuringud.<\/p>\n<p>\u201eUsume, et see uurimisvaldkond on \u00e4\u00e4rmiselt algusj\u00e4rgus ja vajab palju s\u00fcgavamate uuringute l\u00e4biviimist,\u201c \u00fctleb Van Ghetem.<\/p>\n<p>Tulevastes uuringutes on v\u00f5imalik uurida muid meetodeid, mida kurjategijad v\u00f5iksid ajar\u00fcnnakute l\u00e4biviimiseks kasutada, teisi protokolle ja vahekihte, millele r\u00fcnnakud v\u00f5ivad suunatud olla, samuti hinnata populaarsete veebisaitide haavatavust, mis v\u00f5imaldavad selliseid uuringuid vihjeprogrammides.<\/p>\n<p>Nimi \u201eajatu\u201c valiti, \u201esest nende r\u00fcnnakute korral ei kasutanud me mingeid (absoluutseid) ajainfot,\u201c selgitab Van Ghetem.<\/p>\n<p>\u201eLisaks v\u00f5ib neid pidada \u201eajatuteks\u201c ka seet\u00f5ttu, et (kaug) ajar\u00fcnnakud on juba pikka aega kasutusel ja meie uuringute kohaselt olukord ainult halveneb.\u201c<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"DjRwTsUQt58\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/DjRwTsUQt58\/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><br \/>\nT\u00e4istek Usenixi aruandest on saadaval <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/system\/files\/sec20-van_goethem.pdf\">siin<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h4>Reklaami \u00f5igustes<\/h4>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/vdsina.ru\/cloud-servers?partner=habr105\">V\u00f5imsad VDS<\/a><\/noindex> DDoS-r\u00fcnnakute kaitse ja uusim riistvara. K\u00f5ik need on meie <b>epilised serverid<\/b>. Maksimaalne konfiguratsioon - 128 CPU s\u00fcdamikku, 512 GB RAM, 4000 GB NVMe.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/vdsina.ru\/cloud-servers?partner=habr105\"><img decoding=\"async\" alt=\"Aja t\u00f5husate r\u00fcnnakute korraldamine HTTP\/2 ja WPA3 abil\" src=\"\/wp-content\/uploads\/2020\/09\/24ab2d9ab30dd2a713ee4efdcaf75fac.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/vdsina\/blog\/519592\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u043e\u0432\u0430\u044f \u043c\u0435\u0442\u043e\u0434\u0438\u043a\u0430 \u0432\u0437\u043b\u043e\u043c\u0430 \u043f\u0440\u0435\u043e\u0434\u043e\u043b\u0435\u0432\u0430\u0435\u0442 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u00ab\u0434\u0436\u0438\u0442\u0442\u0435\u0440\u0430 \u0441\u0435\u0442\u0438\u00bb, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0432\u043b\u0438\u044f\u0442\u044c \u043d\u0430 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0441\u0442\u044c \u0430\u0442\u0430\u043a \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c \u041d\u043e\u0432\u0430\u044f \u043c\u0435\u0442\u043e\u0434\u0438\u043a\u0430, \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u0430\u044f \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u041b\u0435\u0432\u0435\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0411\u0435\u043b\u044c\u0433\u0438\u044f) \u0438 \u041d\u044c\u044e-\u0419\u043e\u0440\u043a\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0410\u0431\u0443-\u0414\u0430\u0431\u0438, \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0430, \u0447\u0442\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0443\u0442\u0435\u0447\u0435\u043a \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u042d\u0442\u0430 \u043c\u0435\u0442\u043e\u0434\u0438\u043a\u0430 \u043f\u043e\u0434 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c Timeless Timing Attacks, \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f 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