{"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\/ro\/blog\/administrirovanie\/organizacziya-effektivnyh-atak-po-vremeni-s-pomoshhyu-http-2-i-wpa3","title":{"rendered":"Organizarea atacurilor eficiente \u00een timp folosind HTTP\/2 \u0219i WPA3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Noua metod\u0103 de atac ocole\u0219te problema \u201ejitters-ului de re\u021bea\u201d, care poate afecta succesul atacurilor prin canale externe.<\/p>\n<p><img decoding=\"async\" alt=\"Organizarea atacurilor eficiente \u00een timp folosind HTTP\/2 \u0219i WPA3\" src=\"\/wp-content\/uploads\/2020\/09\/c79026eedd1d4411c1c0f49b41acabc9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNoua metod\u0103, dezvoltat\u0103 de cercet\u0103tori de la Universitatea Leuwen (Belgia) \u0219i Universitatea New York din Abu Dhabi, a ar\u0103tat c\u0103 atacatorii pot folosi caracteristicile protocoalelor de re\u021bea pentru a organiza scurgeri de informa\u021bii confiden\u021biale.<\/p>\n<p>Aceast\u0103 metod\u0103, denumit\u0103 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/conference\/usenixsecurity20\/presentation\/van-goethem\">Atacuri Temporale f\u0103r\u0103 Timp<\/a><\/noindex>, a fost demonstrat\u0103 anul acesta la conferin\u021ba Usenix \u0219i folose\u0219te caracteristicile proces\u0103rii cererilor simultane de c\u0103tre protocoalele de re\u021bea pentru a elimina una dintre problemele atacurilor de tip remote pe timp prin canale externe.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Problemele atacurilor de tip remote pe timp<\/h3>\n<p>\n\u00cen cadrul atacurilor temporale, atacatorii m\u0103soar\u0103 diferen\u021bele \u00een timpul de execu\u021bie al diferitelor comenzi, \u00eencerc\u00e2nd s\u0103 ocoleasc\u0103 protec\u021bia oferit\u0103 prin criptare \u0219i s\u0103 ob\u021bin\u0103 date despre informa\u021biile confiden\u021biale, cum ar fi cheile de criptare, coresponden\u021ba privat\u0103 \u0219i comportamentul utilizatorilor \u00een timpul navig\u0103rii pe web.<\/p>\n<p>Dar pentru implementarea cu succes a atacurilor temporale, atacatorul are nevoie de o cunoa\u0219tere precis\u0103 a timpului necesar aplica\u021biei atacate pentru procesarea cererii.<\/p>\n<p>Acest lucru devine problematic atunci c\u00e2nd atac\u0103m sisteme remote, cum ar fi serverele web, deoarece \u00eent\u00e2rzierea \u00een re\u021bea (jitter) duce la varia\u021bii \u00een timpul de r\u0103spuns, complic\u00e2nd calculul timpului de procesare.<\/p>\n<p>\u00cen cursul atacurilor de tip remote pe timp, atacatorii trimit de obicei fiecare comand\u0103 de mai multe ori \u0219i efectueaz\u0103 o analiz\u0103 statistic\u0103 a timpului de r\u0103spuns pentru a reduce influen\u021ba jitter-ului de re\u021bea. Dar aceast\u0103 metod\u0103 este util\u0103 doar \u00eentr-o anumit\u0103 m\u0103sur\u0103.<\/p>\n<p>\u201eCu c\u00e2t diferen\u021ba de timp este mai mic\u0103, cu at\u00e2t sunt necesare mai multe cereri, iar la un anumit moment calculul devine imposibil\u201d, ne spune cercet\u0103torul \u00een securitatea datelor \u0219i principalul autor al lucr\u0103rii despre acest nou tip de atac, Tom Van Goetem.<\/p>\n<h3>Atac pe timp \u201ef\u0103r\u0103 timp\u201d<\/h3>\n<p>\nMetoda dezvoltat\u0103 de Goetem \u0219i colegii s\u0103i realizeaz\u0103 atacuri remote pe timp astfel \u00eenc\u00e2t s\u0103 elimine influen\u021ba jitter-ului de re\u021bea.<\/p>\n<p>Principiul care st\u0103 la baza atacului pe timp f\u0103r\u0103 timp este simplu: trebuie s\u0103 facem astfel \u00eenc\u00e2t cererile s\u0103 ajung\u0103 pe server \u00een exact acela\u0219i moment, \u0219i nu s\u0103 fie transmise secven\u021bial.<\/p>\n<p>Simultanitatea garanteaz\u0103 c\u0103 toate cererile se afl\u0103 \u00een acelea\u0219i condi\u021bii de re\u021bea \u0219i c\u0103 drumul dintre atacator \u0219i server nu influen\u021beaz\u0103 procesarea lor. Ordinea \u00een care sunt primite r\u0103spunsurile va oferi atacatorului toate informa\u021biile necesare pentru a compara timpii de execu\u021bie.<\/p>\n<p>\"Principalul avantaj al atacurilor temporale f\u0103r\u0103 timp este c\u0103 acestea sunt mult mai precise, astfel \u00eenc\u00e2t sunt necesare mai pu\u021bine cereri. Acest lucru \u00eei permite atacatorului s\u0103 recunoasc\u0103 diferen\u021bele de timp de execu\u021bie de p\u00e2n\u0103 la 100 ns\", spune Van Goetem.<\/p>\n<p>Diferen\u021ba minim\u0103 de timp observat\u0103 de cercet\u0103tori \u00een cazul unui atac temporal tradi\u021bional prin Internet a fost de 10 \u00b5s, adic\u0103 de 100 de ori mai mult dec\u00e2t \u00een cazul atacurilor cu cereri simultane.<\/p>\n<h3>Cum se asigur\u0103 simultaneitatea<\/h3>\n<p>\n\"Asigur\u0103m simultaneitatea prin includerea ambelor cereri \u00eentr-un singur pachet de re\u021bea\", explic\u0103 Van Goetem. \"\u00cen practic\u0103, implementarea depinde \u00een principal de protocolul de re\u021bea.\"<\/p>\n<p>Pentru a trimite cereri simultane, cercet\u0103torii utilizeaz\u0103 func\u021bionalit\u0103\u021bile diferitelor protocoale de re\u021bea.<\/p>\n<p>De exemplu, HTTP\/2, care devine rapid standardul de facto pentru serverele web, suport\u0103 \"multiplexarea cererilor\" \u2014 o func\u021bie care permite clientului s\u0103 trimit\u0103 mai multe cereri \u00een paralel printr-o singur\u0103 conexiune TCP.<\/p>\n<p>\"\u00cen cazul HTTP\/2, trebuie doar s\u0103 ne asigur\u0103m c\u0103 ambele cereri sunt incluse \u00eentr-un singur pachet (de exemplu, scriind-le simultan \u00een socket)\". Totu\u0219i, aceast\u0103 metod\u0103 are propriile nuan\u021be. De exemplu, \u00een majoritatea re\u021belelor de livrare a con\u021binutului, cum ar fi Cloudflare, care furnizeaz\u0103 con\u021binut pentru o mare parte din web, conexiunea \u00eentre serverele de front \u0219i site se realizeaz\u0103 prin protocolul HTTP\/1.1, care nu suport\u0103 multiplexarea cererilor.<\/p>\n<p>De\u0219i acest lucru reduce eficien\u021ba atacului temporal, ele r\u0103m\u00e2n totu\u0219i mai precise dec\u00e2t atacurile tradi\u021bionale la distan\u021b\u0103 bazate pe timp, deoarece elimin\u0103 jitter-ul dintre atacator \u0219i serverul CDN de frontier\u0103.<\/p>\n<p>\u00cen cazul protocoalelor care nu suport\u0103 multiplexarea cererilor, atacatorii pot utiliza un protocol de re\u021bea intermediar care \u00eencorporeaz\u0103 cererile.<\/p>\n<p>Cercet\u0103torii au demonstrat cum func\u021bioneaz\u0103 atacul temporal \u00een afara timpului \u00een re\u021beaua Tor. \u00cen acest caz, atacatorul \u00eenglobeaz\u0103 multiple solicit\u0103ri \u00eentr-o celul\u0103 Tor - un pachet criptat, transmis \u00eentre nodurile re\u021belei Tor \u00een pachete TCP unice.<\/p>\n<p>\u201eDeoarece lan\u021bul Tor pentru serviciile onion parcurge tot drumul p\u00e2n\u0103 la server, putem garanta c\u0103 solicit\u0103rile vor ajunge simultan\u201d, spune Van Goetem.<\/p>\n<h3>Atacuri temporale \u00een practic\u0103<\/h3>\n<p>\n\u00cen articolul s\u0103u, cercet\u0103torii au analizat atacuri temporale \u00een trei situa\u021bii diferite.<\/p>\n<p>Upon <b>atacuri directe temporale<\/b> atacatorul se conecteaz\u0103 direct la server \u0219i \u00eencearc\u0103 s\u0103 organizeze o scurgere de informa\u021bii secrete legate de aplica\u021bie.<\/p>\n<p>\u201eDeoarece majoritatea aplica\u021biilor web nu iau \u00een considerare faptul c\u0103 atacurile temporale pot fi foarte practice \u0219i precise, consider\u0103m c\u0103 multe site-uri web sunt vulnerabile la astfel de atacuri\u201d, afirm\u0103 Van Goeten.<\/p>\n<p>Upon <b>atacuri intersite temporale<\/b> atacatorul efectueaz\u0103 solicit\u0103ri c\u0103tre alte site-uri web din browserul victimei \u0219i face presupuneri cu privire la con\u021binutul informa\u021biilor confiden\u021biale, observ\u00e2nd secven\u021ba r\u0103spunsurilor.<\/p>\n<p>Atacatorii au folosit acest mecanism pentru a exploata vulnerabilitatea programului de recompense pentru bug-uri HackerOne \u0219i au ob\u021binut informa\u021bii precum cuvintele cheie utilizate \u00een rapoartele confiden\u021biale despre vulnerabilit\u0103\u021bile nerezolvate.<\/p>\n<p>\u201eC\u0103utam cazuri \u00een care atacul temporal fusese \u00eenregistrat anterior, dar nu fusese considerat eficient. Despre bug-ul HackerOne s-a raportat cel pu\u021bin de trei ori (identificatorii bug-ului: <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> \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/hackerone.com\/reports\/4701\">4701<\/a><\/noindex>), dar nu a fost remediat deoarece se credea c\u0103 acest atac nu poate fi exploatat. Atunci am creat un simplu proiect de cercetare intern cu atacuri temporale \u00een afara timpului.<\/p>\n<p>La acea vreme, era \u00eenc\u0103 foarte neoptimizat, deoarece continu\u0103m s\u0103 ne ocup\u0103m cu detaliile atacului, dar, cu toate acestea, s-a dovedit destul de precis (pe conexiunea mea WiFi de acas\u0103 am reu\u0219it s\u0103 ob\u021bin rezultate foarte precise).<\/p>\n<p>Cercet\u0103torii au \u00eencercat de asemenea s\u0103 efectueze <b>atacuri temporale \u00een afara timpului pe protocolul WiFi WPA3<\/b>.<\/p>\n<p>Unul dintre coautorii articolului, Matti Vanhoef, a descoperit anterior <noindex><a rel=\"nofollow\" href=\"https:\/\/wpa3.mathyvanhoef.com\/\">o scurgere poten\u021bial\u0103 de timp \u00een protocolul de confirmare a conexiunii WPA3.<\/a><\/noindex>. Dar timpul fie a fost prea scurt pentru a fi folosit pe dispozitive cu performan\u021be ridicate, fie nu a putut fi utilizat \u00eempotriva serverelor.<\/p>\n<p>\u201eCu ajutorul unui nou tip de atacuri temporale f\u0103r\u0103 timp, am demonstrat c\u0103 se poate folosi handshake-ul de autentificare (EAP-pwd) \u00eempotriva serverelor, chiar dac\u0103 acestea ruleaz\u0103 pe hardware puternic\u201d, explic\u0103 Van Goetem.<\/p>\n<h3>Momentul ideal<\/h3>\n<p>\n\u00cen articolul lor, cercet\u0103torii au oferit recomand\u0103ri pentru protejarea serverelor \u00eempotriva atacurilor temporale f\u0103r\u0103 timp, de exemplu, limitarea execu\u021biei la un timp constant \u0219i ad\u0103ugarea unei \u00eent\u00e2rzieri aleatoare. Implementarea unor m\u0103suri practice de protec\u021bie \u00eempotriva atacurilor temporale directe, care s\u0103 afecteze pu\u021bin func\u021bionarea re\u021belei, necesit\u0103 cercet\u0103ri suplimentare.<\/p>\n<p>\u201eConsider\u0103m c\u0103 acest domeniu de cercetare se afl\u0103 \u00eentr-o etap\u0103 foarte timpurie de dezvoltare \u0219i necesit\u0103 studii mult mai aprofundate\u201d, afirm\u0103 Van Goetem.<\/p>\n<p>\u00cen viitoarele cercet\u0103ri, ar putea fi investigate alte metode pe care autorii de atacuri le-ar putea folosi pentru a efectua atacuri temporale simultane, alte protocoale \u0219i straturi intermediare de re\u021bea care pot fi atacate, precum \u0219i evaluarea vulnerabilit\u0103\u021bii site-urilor web populare care permit astfel de cercet\u0103ri \u00een cadrul unor programe de descoperire a bug-urilor.<\/p>\n<p>Numele \u201ef\u0103r\u0103 timp\u201d a fost ales \u201edeoarece la aceste atacuri nu am folosit nicio informa\u021bie (absolut\u0103) despre timp\u201d, explic\u0103 Van Goetem.<\/p>\n<p>\u201e\u00cen plus, ele pot fi considerate 'f\u0103r\u0103 timp' \u0219i pentru c\u0103 atacurile (la distan\u021b\u0103) temporale au fost utilizate de mult, iar, conform cercet\u0103rilor noastre, situa\u021bia se va agrava doar\u201d.<\/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=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nTextul complet al raportului cu Usenix se afl\u0103 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.usenix.org\/system\/files\/sec20-van_goethem.pdf\">aici<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h4>\u00cen numele publicit\u0103\u021bii<\/h4>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/vdsina.ru\/cloud-servers?partner=habr105\">VDS puternice<\/a><\/noindex> cu protec\u021bie \u00eempotriva atacurilor DDoS \u0219i cele mai noi echipamente. Toate acestea se refer\u0103 la serverele noastre <b>epice<\/b>. Configura\u021bia maxim\u0103 - 128 nuclee CPU, 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=\"Organizarea atacurilor eficiente \u00een timp folosind HTTP\/2 \u0219i WPA3\" src=\"\/wp-content\/uploads\/2020\/09\/24ab2d9ab30dd2a713ee4efdcaf75fac.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Sursa: <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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