{"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-puhelun-sieppaaminen","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/fi\/puhelun-kuuntelu\/ss7-puhelun-sieppaaminen\/","title":{"rendered":"SS7-puhelujen sieppaus"},"content":{"rendered":"<p>Matkaviestinlaitoksen MSC:ll\u00e4 on yleens\u00e4 hallussaan salausavaimet, joita kukin tilaaja k\u00e4ytt\u00e4\u00e4 puhelun muodostamiseen. Kun tilaaja on liikkeell\u00e4, luovutusprosessi helpottaa tilaajan sujuvaa siirtymist\u00e4 eri radiosolujen v\u00e4lill\u00e4 puhelun etenemisen pysyess\u00e4 samana.<\/p>\n<p>Joissakin tapauksissa tilaaja siirtyy solusta toiseen, jota hallinnoi eri VLR. T\u00e4ll\u00f6in uudella VLR:ll\u00e4 ei aluksi ole todennustietoja, jotka helpottaisivat puhelun s\u00e4ilytt\u00e4mist\u00e4, joten avainten siirt\u00e4minen uuteen MSC:hen edellytt\u00e4\u00e4 MSC:n v\u00e4list\u00e4 luovutusprosessia.<\/p>\n<p>T\u00e4m\u00e4 tapahtuu MAP-sanomalla nimelt\u00e4 sendIdentification. Uusi VLR l\u00e4hett\u00e4\u00e4 sendIdentification-sanoman vanhalle VLR:lle, joka puolestaan vastaa avaimilla, joita tarvitaan k\u00e4ynniss\u00e4 olevan puhelun yll\u00e4pit\u00e4miseksi.  N\u00e4ihin avaimiin kuuluu muun muassa avain, jota k\u00e4ytet\u00e4\u00e4n ilmassa tapahtuvan liikenteen salaamiseen. Hy\u00f6kk\u00e4ysskenaariossa hy\u00f6kk\u00e4\u00e4j\u00e4 kaappaa kohteen liikenteen ilmaliittym\u00e4n kautta (mik\u00e4 edellytt\u00e4\u00e4 kohteen fyysist\u00e4 l\u00e4heisyytt\u00e4).<\/p>\n<p>Kun h\u00e4nell\u00e4 on p\u00e4\u00e4sy SS7:\u00e4\u00e4n, h\u00e4n voi k\u00e4ytt\u00e4\u00e4 sendIdentification-viesti\u00e4 saadakseen kohteen salauksenpurkuavaimet ja k\u00e4ytt\u00e4\u00e4 niit\u00e4 liikenteen salauksen purkamiseen. sendIdentification-sanomaa tarvitaan vain sis\u00e4verkon sis\u00e4ll\u00e4, kun<br \/>\nluovutukset. Sit\u00e4 ei saisi k\u00e4ytt\u00e4\u00e4 oikeutetusti ulkopuolelta, joten se olisi suodatettava rajalla.<\/p>\n<h2>L\u00e4htevien puhelujen sieppaaminen<\/h2>\n<p>GSM-palvelun ohjaustoiminto (gsmSCF) on toiminnallinen kokonaisuus, joka sis\u00e4lt\u00e4\u00e4 CAMEL-palvelulogiikan, joka p\u00e4\u00e4tt\u00e4\u00e4 tietyn tapahtumaryhm\u00e4n osalta, voidaanko haluttua toimintoa jatkaa muutettuna, muuttamattomana tai keskeytettyn\u00e4. Sit\u00e4 voidaan k\u00e4ytt\u00e4\u00e4 esimerkiksi l\u00e4htevien numeroiden muuttamiseen siten, ett\u00e4 niihin lis\u00e4t\u00e4\u00e4n suuntanumero tai kansainv\u00e4linen muoto.<\/p>\n<p>Hy\u00f6kk\u00e4\u00e4j\u00e4, jolla on p\u00e4\u00e4sy SS7:\u00e4\u00e4n, voi k\u00e4ytt\u00e4\u00e4 insertSubscriberData-viesti\u00e4 vaihtaakseen tilaajan gsmSCF-osoitteen hallitsemakseen osoitteeksi. T\u00e4m\u00e4n j\u00e4lkeen hy\u00f6kk\u00e4\u00e4j\u00e4 voi kirjoittaa l\u00e4htev\u00e4t numerot uudelleen hallitsemiinsa numeroihin. T\u00e4ll\u00f6in hy\u00f6kk\u00e4\u00e4j\u00e4 vastaanottaa l\u00e4htev\u00e4n puhelun, nauhoittaa puhelun ennen liikenteen v\u00e4litt\u00e4mist\u00e4 lopulliseen m\u00e4\u00e4r\u00e4np\u00e4\u00e4h\u00e4n.<\/p>\n<h2>Kuuntelu - Saapuva liikenne - Puhelujen v\u00e4litt\u00e4minen eteenp\u00e4in<\/h2>\n<p>RegisterSS-sanomaa k\u00e4ytet\u00e4\u00e4n lis\u00e4palvelujen rekister\u00f6imiseen tilaajalle. Yksi n\u00e4ist\u00e4 palveluista on puhelunsiirtopalvelu. Hy\u00f6kk\u00e4\u00e4j\u00e4 voi k\u00e4ytt\u00e4\u00e4 registerSS-sanomaa ottaakseen k\u00e4ytt\u00f6\u00f6n soitonsiirron hallitsemaansa numeroon. Kun hy\u00f6kk\u00e4\u00e4j\u00e4 vastaanottaa puhelun, h\u00e4n k\u00e4ytt\u00e4\u00e4 eraseSS-sanomaa poistaakseen puhelunsiirron ja siirt\u00e4\u00e4kseen puhelun takaisin tilaajalle. T\u00e4ll\u00e4 tavoin hy\u00f6kk\u00e4\u00e4j\u00e4 voi kuunnella ja nauhoittaa puhelun.<\/p>","protected":false},"excerpt":{"rendered":"<p>Matkaviestinlaitoksen MSC:ll\u00e4 on yleens\u00e4 hallussaan salausavaimet, joita kukin tilaaja k\u00e4ytt\u00e4\u00e4 puhelun muodostamiseen. Kun tilaaja on liikkeell\u00e4, luovutusprosessi helpottaa tilaajan sujuvaa siirtymist\u00e4 eri radiosolujen v\u00e4lill\u00e4 puhelun etenemisen pysyess\u00e4 samana. Joissakin tapauksissa tilaaja siirtyy...<\/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\/fi\/puhelun-kuuntelu\/ss7-puhelun-sieppaaminen\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\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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