{"id":360,"date":"2023-12-07T03:12:42","date_gmt":"2023-12-07T00:12:42","guid":{"rendered":"https:\/\/sms-txt.net\/?p=360"},"modified":"2024-09-05T12:44:42","modified_gmt":"2024-09-05T09:44:42","slug":"ss7-skambucio-peremimas","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/lt\/skambuciu-peremimas\/ss7-skambucio-peremimas\/","title":{"rendered":"SS7 skambu\u010di\u0173 per\u0117mimas"},"content":{"rendered":"<p>Mobiliojo ry\u0161io komutacinis centras MSC paprastai turi \u0161ifravimo raktus, kuriuos naudoja kiekvienas abonentas, kad gal\u0117t\u0173 u\u017emegzti skambut\u012f. Kai abonentas keliauja, perdavimo procesas palengvina skland\u0173 abonento per\u0117jim\u0105 i\u0161 vienos radijo l\u0105stel\u0117s \u012f kit\u0105, i\u0161laikant skambu\u010dio eig\u0105.<\/p>\n<p>Kai kuriais atvejais abonentas persikelia i\u0161 vienos l\u0105stel\u0117s \u012f kit\u0105, kuri\u0105 valdo kitas VLR. Tokiu atveju naujasis VLR i\u0161 prad\u017ei\u0173 neturi autentifikavimo informacijos, kuri pad\u0117t\u0173 i\u0161saugoti skambut\u012f, tod\u0117l, norint perduoti raktus naujajam MSC, reikalingas perdavimo procesas tarp MSC.<\/p>\n<p>Tai atliekama naudojant MAP prane\u0161im\u0105 \"sendIdentification\". Naujasis VLR siun\u010dia sendIdentification prane\u0161im\u0105 senajam VLR, kuris savo ruo\u017etu atsako raktais, reikalingais vykstan\u010diam skambu\u010diui palaikyti.  Tarp \u0161i\u0173 rakt\u0173 yra raktas, naudojamas srautui eteryje u\u017e\u0161ifruoti. Atakos scenarijuje u\u017epuolikas fiksuoja taikinio duomen\u0173 sraut\u0105 per oro s\u0105saj\u0105 (reikia fizinio artumo nuo taikinio).<\/p>\n<p>Tur\u0117damas prieig\u0105 prie SS7, jis gali naudoti \"sendIdentification\" prane\u0161im\u0105, kad gaut\u0173 tikslo de\u0161ifravimo raktus ir juos panaudot\u0173 srautui i\u0161\u0161ifruoti. SendIdentification reikalingas tik vidiniame tinkle, kai<br \/>\nperdavimai. Jis netur\u0117t\u0173 b\u016bti teis\u0117tai naudojamas i\u0161 i\u0161or\u0117s, tod\u0117l tur\u0117t\u0173 b\u016bti filtruojamas pasienyje.<\/p>\n<h2>I\u0161einan\u010di\u0173 skambu\u010di\u0173 per\u0117mimas<\/h2>\n<p>GSM paslaugos valdymo funkcija (gsmSCF) yra funkcinis vienetas, kuriame yra CAMEL paslaugos logika, pagal kuri\u0105 tam tikro \u012fvyki\u0173 rinkinio atveju nusprend\u017eiama, ar norimas veiksmas gali b\u016bti t\u0119siamas modifikuotas, nemodifikuotas arba nutrauktas. Pavyzd\u017eiui, ji gali b\u016bti naudojama i\u0161einantiems numeriams modifikuoti, kad b\u016bt\u0173 prid\u0117tas vietov\u0117s kodas arba tarptautinis formatas.<\/p>\n<p>U\u017epuolikas, turintis prieig\u0105 prie SS7, gali naudoti insertSubscriberData prane\u0161im\u0105, kad pakeist\u0173 abonento gsmSCF adres\u0105 \u012f savo kontroliuojam\u0105 adres\u0105. Tada u\u017epuolikas gali perra\u0161yti i\u0161einan\u010dius numerius \u012f savo kontroliuojam\u0105 numer\u012f. \u0160iuo atveju u\u017epuolikas gaus i\u0161einant\u012f skambut\u012f, \u012fra\u0161ys skambut\u012f ir tik tada persi\u0173s sraut\u0105 \u012f galutin\u0119 paskirties viet\u0105.<\/p>\n<h2>\u012eeinan\u010dio srauto per\u0117mimas - Skambu\u010di\u0173 peradresavimas<\/h2>\n<p>Prane\u0161imas registerSS naudojamas papildomoms paslaugoms abonentui registruoti. Viena i\u0161 \u0161i\u0173 paslaug\u0173 yra skambu\u010di\u0173 peradresavimo paslauga. U\u017epuolikas gali naudoti registerSS prane\u0161im\u0105, kad \u012fjungt\u0173 skambu\u010di\u0173 peradresavim\u0105 \u012f jo kontroliuojam\u0105 numer\u012f. Gav\u0119s skambut\u012f, u\u017epuolikas, naudodamasis prane\u0161imu eraseSS, panaikina skambu\u010dio peradresavim\u0105 ir skambut\u012f peradresuoja atgal abonentui. Taip u\u017epuolikas gali perimti ir \u012fra\u0161yti skambut\u012f.<\/p>","protected":false},"excerpt":{"rendered":"<p>Mobiliojo ry\u0161io komutacinis centras MSC paprastai turi \u0161ifravimo raktus, kuriuos naudoja kiekvienas abonentas, kad gal\u0117t\u0173 u\u017emegzti skambut\u012f. Kai abonentas keliauja, perdavimo procesas palengvina skland\u0173 abonento per\u0117jim\u0105 i\u0161 vienos radijo l\u0105stel\u0117s \u012f kit\u0105, i\u0161laikant skambu\u010dio eig\u0105. Kai kuriais atvejais abonentas pereina i\u0161...<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-360","post","type-post","status-publish","format-standard","hentry","category-call-interception"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SS7 Call Interception<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sms-txt.net\/lt\/skambuciu-peremimas\/ss7-skambucio-peremimas\/\" \/>\n<meta property=\"og:locale\" content=\"lt_LT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SS7 Call Interception\" \/>\n<meta property=\"og:description\" content=\"The mobile switching center MSC normally holds the encryption keys used by each subscriber to be able to establish the call. 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