{"id":460,"date":"2024-04-05T08:01:12","date_gmt":"2024-04-05T05:01:12","guid":{"rendered":"https:\/\/sms-txt.net\/?p=460"},"modified":"2024-09-05T12:46:28","modified_gmt":"2024-09-05T09:46:28","slug":"usynlig-opfangning-af-korte-beskeder-ss7-angreb","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/da\/sms-aflytning\/usynlig-opfangning-af-korte-beskeder-ss7-angreb\/","title":{"rendered":"Usynlig aflytning af korte beskeder - SS7-angreb"},"content":{"rendered":"<p>Usynlig aflytning af korte beskeder<\/p>\n<p>Masser af tjenester bruger dog SMS som en station. For eksempel bruger bankinstitutioner SMS til at f\u00e5 OTP (One Time Password) forsendelse og forsendelse, sociale netv\u00e6rk - s\u00e5som hentning af adgangskode, budbringere - til at f\u00e5 adgang til ans\u00f8gningen. Angrebet \u00f8del\u00e6gger, at en abonnent er i f\u00e6rd med at drive i et socialt netv\u00e6rk. Selv HLR forst\u00e5r en liste over denne abonnents nye placering, hvor telefonopkald og SMS-beskeder er blevet sendt. Hvis der er en prognose, mislykkes fors\u00f8get, selv om netv\u00e6rket tilmelder abonnenten direkte tilbage i sit eget hjemmenetv\u00e6rk. Angriberen finder ud af, at han kan gentage angrebet for at f\u00e5 opkaldsfors\u00f8get til at mislykkes. I tilf\u00e6lde af at angriberne begr\u00e6nser netv\u00e6rksdelen, der signaleres for at f\u00e5 en MSC, kan de opfange afsluttende SMS-beskeder og ogs\u00e5 omdirigere asynkrone taleopkald.<\/p>\n<p>&nbsp;<\/p>\n<p>N\u00e5r tilmeldingen er gennemf\u00f8rt, sendes alle sms'er til netv\u00e6rkssektionen, der signaleres som MSC og VLR fra UpdateLocation-signaleringskonceptet.<\/p>\n<h2>Den angrebne abonnent kan vende tilbage til hjemmenetv\u00e6rket, s\u00e5 snart en af f\u00f8lgende begivenheder udl\u00f8ses:<\/h2>\n<ul>\n<li>Udg\u00e5ende opkald;<\/li>\n<li>Udg\u00e5ende SMS;<\/li>\n<li>Flytter til det omr\u00e5de, der d\u00e6kkes af en anden mobil switch;<\/li>\n<li>Genstart af mobiltelefon.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Fra angriberens synspunkt er det up\u00e5lideligt at beholde den abonnent, der er tilmeldt det \"falske\" netv\u00e6rk, da det ikke er en mulig opgave at forudsige alle abonnentens aktiviteter.<\/p>\n<p>&nbsp;<\/p>\n<p>Angrebet \u00f8del\u00e6gger, at en abonnent, der er tilmeldt et separat netv\u00e6rk, derfor kan din nuv\u00e6rende MSC\/VLR bruges til taleopkald sammen med oprindelige SMS-beskeder, og ogs\u00e5 en falsk MSC kan bruges til at f\u00e5 afsluttende SMS-beskeder.<\/p>\n<p>&nbsp;<\/p>\n<p>Angriberne kan bruge dette til at angribe tjenester i forskellige programmer (som f.eks. finansinstituttets konto), der bruger SMS til en station for at se kunder p\u00e5 nogle skift. Hvis den ubudne g\u00e6st kontrollerer netv\u00e6rksdelen, som signaleres at v\u00e6re en ny MSC, er de i stand til at opfange afsluttende SMS-beskeder, der leveres med tjenester som mobilbank, hentning af adgangskode til webtjenester, adgang til tilg\u00e6ngelighedskoder som messengers osv. Alle disse manipulationer har en tendens til ikke at forhindre den angrebne abonnent i at oprette nye telefonopkald og levere SMS'er, men SMS'erne g\u00e5r til MSC-adressen.<\/p>\n<p>&nbsp;<\/p>\n<p>Desuden er denne s\u00e5rbarhed ogs\u00e5 velkendt, og de fleste SS7-firewalludbydere bestr\u00e6ber sig p\u00e5 at forhindre tilmelding til \"falske\" netv\u00e6rk. Almindeligvis er mekanismen i en SS7-firewall baseret p\u00e5 dens database, der indeholder eksisterende abonnenters placeringer. Derudover skal en SS7-firewall have et hastighedsspisebord, der repr\u00e6senterer en periode for at opn\u00e5 n\u00e6sten n\u00e6sten enhver nation. Hastigheden mellem 2 tyske netv\u00e6rk er nul; hastigheden mellem Madagaskar og Tyskland vil stadig v\u00e6re 8, det er l\u00e6ngden af en tur osv.<\/p>\n<p>&nbsp;<\/p>\n<p>N\u00e5r en UpdateLocation-kommunikation er opn\u00e5et fra netv\u00e6rket, udtr\u00e6kker SS7-firewallen informationen som et resultat af abonnentens identifikator IMSI samt ogs\u00e5 adressen p\u00e5 en VLR,\" pr\u00e6fiks, som sandsynligvis snart utvivlsomt kan bruges til at komme p\u00e5 tv\u00e6rs af satsv\u00e6rdien.<\/p>\n<p>&nbsp;<\/p>\n<p>Dern\u00e6st s\u00f8ger SS7-firewallen aktivt efter abonnentens placering i databasen. Selv SS7-firewallen b\u00e6rer VLR-pr\u00e6fikset og bruger det, mens hemmeligheden til at specificere n\u00f8jagtigt hastighedsprisen; beregner ogs\u00e5 tilmeldingsperioden og ogs\u00e5 en periodeoverf\u00f8rsel mellem dit nuv\u00e6rende tidspunkt. Hvis tidsforskydningen er kortere end hastighedsv\u00e6rdien, opfattes UpdateLocation-materialet som aggressivt og b\u00f8r blokeres. UpdateLocation-kommunikation b\u00f8r virkelig v\u00e6re tilladt.<\/p>\n<p>&nbsp;<\/p>\n<p>For at springe denne beskyttelsesmekanisme over kan skadevolderen tilmelde abonnenten i det \"falske\" netv\u00e6rk og kun gendanne MSC-adressen og fors\u00f8ge at beholde den \u00e6gte VLR-adresse. Derfor er opm\u00e6rksomheden p\u00e5 denne VLR-adresse m\u00e5ske ikke tilstr\u00e6kkelig til at v\u00e6lge, om de m\u00e5lrettede bes\u00f8gende skal forhindres. Tilmelding sammen med MSC- og VLR-adresser er betydeligt mere p\u00e5lidelig for at f\u00e5 den ubudne g\u00e6st og hj\u00e6lper ogs\u00e5 med at omg\u00e5 nogle SS7-firewalls med regler.<\/p>\n<p>&nbsp;<\/p>\n<p>Da vi nemt kan se, at en r\u00e6kke SS7-firewalls ikke er p\u00e5lidelige sikkerhedsprogrammer, selv om det faktum, at angrebsm\u00e6rket er nemt.<\/p>","protected":false},"excerpt":{"rendered":"<p>Usynlig aflytning af korte beskeder Mange tjenester bruger dog SMS som en station. For eksempel bruger bankinstitutioner SMS til at f\u00e5 OTP (One Time Password) forsendelse og forsendelse, sociale netv\u00e6rk - s\u00e5som hentning af adgangskode, budbringere - til at f\u00e5 adgang til ans\u00f8gningen. Angrebet \u00f8del\u00e6gger, at en abonnent er p\u00e5 vej ind i et socialt netv\u00e6rk....<\/p>","protected":false},"author":1,"featured_media":1738,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,70,69,1],"tags":[],"class_list":["post-460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-call-interception","category-location-tracking","category-sms-intercept","category-ss7-sms"],"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>Invisible Interception of Short Messages - SS7 attack<\/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\/da\/sms-aflytning\/usynlig-opfangning-af-korte-beskeder-ss7-angreb\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Invisible Interception of Short Messages - SS7 attack\" \/>\n<meta property=\"og:description\" content=\"Invisible Interception of Short Messages Lots of services however utilize SMS like a station. By way of instance, banking institutions utilize SMS to get OTP (One Time Password) shipping and shipping, societal networks&#8211;such as password retrieval, messengers&#8211;to get access to the applying. 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