{"id":40585,"date":"2020-02-02T10:38:22","date_gmt":"2020-02-02T07:38:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimosti-setej-5g"},"modified":"2020-02-02T10:38:22","modified_gmt":"2020-02-02T07:38:22","slug":"uyazvimosti-setej-5g","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/uyazvimosti-setej-5g","title":{"rendered":"S\u00e5rbarheder i 5G-netv\u00e6rk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/656548e68c974d920250349994b24721.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Mens entusiaster venter sp\u00e6ndt p\u00e5 den brede indf\u00f8relse af 5G-netv\u00e6rk, gnider cyberkriminelle h\u00e6nderne og ser frem til nye muligheder for profit. P\u00e5 trods af alle udviklernes bestr\u00e6belser har 5G-teknologien s\u00e5rbarheder, hvis identifikation kompliceres af manglen p\u00e5 erfaring i de nye forhold. Vi har unders\u00f8gt et lille 5G-netv\u00e6rk og identificeret tre typer s\u00e5rbarheder, som vi vil beskrive i dette indl\u00e6g. <\/i><br \/>\n <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Unders\u00f8gelsens objekt<\/h3>\n<p>\nLad os tage et simpelt eksempel \u2014 et modelm\u00e6ssigt ikke-offentligt 5G-netv\u00e6rk (Non-Public Network, NPN) ved en studenterby, der er forbundet til omverdenen via offentlige kommunikationskanaler. Netop s\u00e5danne netv\u00e6rk vil i den n\u00e6rmeste fremtid blive brugt som standard i alle lande, der deltager i kapl\u00f8bet om 5G. Den potentielle milj\u00f8 for implementeringen af netv\u00e6rk med denne konfiguration er 'smarte' virksomheder, 'smarte' byer, store virksomheders kontorer og andre lignende steder med h\u00f8j grad af styring. <\/p>\n<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/266e447d122674db9fc694ff86b4bcdd.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <i>NPN-infrastruktur: et lukket virksomhedsnetv\u00e6rk, der er koblet til det globale 5G-netv\u00e6rk gennem offentlige kanaler. Kilde: Trend Micro<\/i><\/p>\n<p>I mods\u00e6tning til fjerde generations netv\u00e6rk er 5G-netv\u00e6rk designet til at behandle data i realtid, hvilket g\u00f8r deres arkitektur til en multilagspie. Opdelingen i lag g\u00f8r det lettere at interagere ved standardisering af API'er til kommunikation mellem lagene.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/4a6c70ab37b8a15ef32c14bba947bd65.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Sammenligning af arkitekturerne 4G og 5G. Kilde: Trend Micro<\/i><\/p>\n<p>Resultatet er forbedrede muligheder for automatisering og skalering, hvilket er kritisk for behandling af enorme m\u00e6ngder data fra Internet of Things (IoT).<br \/>\nDen isolering af lagene, der er indbygget i 5G-standarden, f\u00f8rer til et nyt problem: sikkerhedssystemer, der arbejder inden for NPN-netv\u00e6rket, beskytter objektet og dets private sky, mens sikkerhedssystemer i eksterne netv\u00e6rk beskytter deres interne infrastruktur. Trafikken mellem NPN og eksterne netv\u00e6rk betragtes som sikker, da den kommer fra beskyttede systemer, men i virkeligheden er der ingen, der beskytter den. <\/p>\n<p>I vores seneste unders\u00f8gelse <noindex><a rel=\"nofollow\" href=\"https:\/\/documents.trendmicro.com\/assets\/white_papers\/wp-securing-5g-through-cyber-telecom-identity-federation.pdf\">Securing 5G Through Cyber-Telecom Identity Federation<\/a><\/noindex> giver vi flere scenarier for cyberangreb p\u00e5 5G-netv\u00e6rk, der udnytter:<\/p>\n<ul>\n<li>s\u00e5rbarheder i SIM-kort,<\/li>\n<li>s\u00e5rbarheder i netv\u00e6rket,<\/li>\n<li>s\u00e5rbarheder i identifikationssystemet.<\/li>\n<\/ul>\n<p>\nLad os se n\u00e6rmere p\u00e5 hver s\u00e5rbarhed. <\/p>\n<h3>S\u00e5rbarheder i SIM-kort<\/h3>\n<p>\nSIM-kortet er en kompleks enhed, der endda har et helt s\u00e6t indbyggede applikationer \u2014 SIM Toolkit, STK. Et af disse programmer \u2014 S@T Browser \u2014 kan teoretisk bruges til at browse interne operat\u00f8rsider, men i praksis er det l\u00e6nge glemt og er ikke blevet opdateret siden 2009, da disse funktioner nu udf\u00f8res af andre programmer. <\/p>\n<p>Problemet er, at S@T Browser viste sig at v\u00e6re s\u00e5rbar: en specielt forberedt service-SMS hacker SIM-kortet og tvinger det til at udf\u00f8re de kommandoer, som hackeren \u00f8nsker, mens brugeren af telefonen eller enheden ikke vil bem\u00e6rke noget us\u00e6dvanligt. Angrebet blev kaldt <noindex><a rel=\"nofollow\" href=\"https:\/\/simjacker.com\/downloads\/technicalpapers\/AdaptiveMobile_Security_Simjacker_Technical_Paper_v1.01.pdf\">Simjaker<\/a><\/noindex> og giver mange muligheder for angribere. <\/p>\n<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/d23b7f7a77838d76a881a40d721eabb7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Simjacking-angreb i 5G-netv\u00e6rk. Kilde: Trend Micro<\/i><\/p>\n<p>Specifikt tillader det, at angriberen modtager data om abonnentens placering, identifikatoren for hans enhed (IMEI) og mobilmastens identifikator (Cell ID), samt at tvinge telefonen til at ringe et nummer, sende SMS, \u00e5bne et link i browseren og endda deaktivere SIM-kortet. <\/p>\n<p>I 5G-netv\u00e6rk bliver denne s\u00e5rbarhed ved SIM-kort et alvorligt problem, taget i betragtning af antallet af tilsluttede enheder. Selvom <noindex><a rel=\"nofollow\" href=\"https:\/\/venturebeat.com\/2018\/12\/14\/simalliance-a-new-5g-sim-card-is-necessary-to-beef-up-network-security\/\">SIMAlliance har udviklet nye standarder for SIM-kort til 5G med forbedret sikkerhed<\/a><\/noindex>, er det stadig <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ericsson.com\/en\/blog\/2020\/1\/5g-security-sim-card\">muligt at bruge \"gamle\" SIM-kort<\/a><\/noindex>. Og da alt fungerer som det skal, er det ikke sandsynligt, at vi snart vil se en hurtig udskiftning af de eksisterende SIM-kort. <\/p>\n<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/208833a443e53b03c07f415476144a4b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Sundhedsm\u00e6ssig misbrug af roaming. Kilde: Trend Micro<\/i><\/p>\n<p>Brugen af Simjacking muligg\u00f8r tvangsskift af SIM-kortet til roaming-tilstand og tvinger det til at forbinde til en mobilmast, som angriberen kontrollerer. Derved f\u00e5r angriberen mulighed for at \u00e6ndre SIM-kortets indstillinger for at overv\u00e5ge telefonopkald, implementere ondsindet software og udf\u00f8re forskellige former for angreb ved hj\u00e6lp af enheden, der indeholder det hacket SIM-kort. Dette er muligt, da interaktionen med enheder i roaming sker uden om de sikkerhedsprocedurer, der er g\u00e6ldende for enheder i det \"hjemlige\" net. <\/p>\n<h3>Netv\u00e6rkss\u00e5rbarheder <\/h3>\n<p>\nAngrebere kan \u00e6ndre indstillingerne p\u00e5 et kompromitteret SIM-kort for at opn\u00e5 deres m\u00e5l. Den relative lethed og diskretion ved Simjaking-angrebet g\u00f8r det muligt at udf\u00f8re det p\u00e5 et kontinuerligt basis, hvor de langsomt og t\u00e5lmodigt overtager kontrol over flere enheder,<noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflare.com\/learning\/ddos\/ddos-low-and-slow-attack\/\">lav og langsom angreb<\/a><\/noindex>og sk\u00e6rer stykker af netv\u00e6rket som skiver af salami.<noindex><a rel=\"nofollow\" href=\"https:\/\/ajmaurya.wordpress.com\/2014\/03\/27\/what-is-a-salami-attack\/\">salami-angreb<\/a><\/noindex>Det er ekstremt vanskeligt at spore s\u00e5dan en p\u00e5virkning, og under komplekse forhold i et distribueret 5G-netv\u00e6rk er det n\u00e6sten umuligt. <\/p>\n<p><img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/36e5f0da189c645567d97eeefa3643de.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Gradvis integration i 5G-netv\u00e6rk ved hj\u00e6lp af Low and Slow + Salami-angreb. Kilde: Trend Micro<\/i><\/p>\n<p>Da 5G-netv\u00e6rk ikke har indbyggede kontrolmekanismer for SIM-kort, vil angriberne gradvist f\u00e5 mulighed for at etablere deres egne regler inden for 5G-kommunikationsdom\u00e6net ved at bruge fangede SIM-kort til at stj\u00e6le penge, autentificere p\u00e5 netv\u00e6rksniveau, installere malware og udf\u00f8re anden ulovlig aktivitet. <\/p>\n<p>Det v\u00e6kker s\u00e6rlig bekymring, at der er dukket v\u00e6rkt\u00f8jer op p\u00e5 hackerfora, der automatiserer opsnapning af SIM-kort ved hj\u00e6lp af Simjaking, da brugen af s\u00e5danne midler til femte generations netv\u00e6rk giver angribere praktisk talt ubegr\u00e6nsede muligheder for at skalere angreb og modificere betroet trafik. <\/p>\n<p><b><\/p>\n<h3>Identifikationsanfald<\/h3>\n<p><\/b><br \/>\nSIM-kortet bruges til at identificere enheden i netv\u00e6rket. Hvis SIM-kortet er aktivt og har en positiv saldo, betragtes enheden automatisk som legitim og v\u00e6kker ikke mistanke p\u00e5 det systemiske detektionsniveau. Imidlertid g\u00f8r s\u00e5rbarheden ved selve SIM-kortet hele identifikationssystemet s\u00e5rbart. IT-sikkerhedssystemer vil simpelthen ikke v\u00e6re i stand til at spore en ulovligt tilsluttet enhed, hvis den registrerer sig i netv\u00e6rket med de stj\u00e5lne identifikationsoplysninger via Simjaking. <\/p>\n<p>Det viser sig, at en hacker, der tilslutter sig netv\u00e6rket via et hacket SIM-kort, f\u00e5r adgang p\u00e5 samme niveau som den rigtige ejer, da IT-systemer ikke l\u00e6ngere verificerer enheder, der er blevet identificeret p\u00e5 netv\u00e6rksniveau. <\/p>\n<p>Den garanterede identifikation mellem det programmatisk og netv\u00e6rksniveau tilf\u00f8jer et yderligere problem: Kriminelle kan med vilje skabe \"st\u00f8j\" for indtr\u00e6ngningsdetekteringssystemer ved konstant at udf\u00f8re forskellige mist\u00e6nkelige handlinger p\u00e5 vegne af fangede legitime enheder. Da driften af automatiske detectionssystemer er baseret p\u00e5 analyse af statistikker, vil t\u00e6rskelv\u00e6rdierne for alarmovertr\u00e6delser gradvist stige, hvilket sikrer, at der ikke reageres p\u00e5 reelle angreb. En l\u00e6ngerevarende p\u00e5virkning af denne art kan \u00e6ndre hele netv\u00e6rkets funktion og skabe statistiske \"blinde zoner\" for detectionssystemer. Kriminelle, der kontrollerer s\u00e5danne zoner, kan udf\u00f8re angreb p\u00e5 data internt i netv\u00e6rket samt p\u00e5 fysiske enheder, organisere tjenesten\u00e6gtelse og p\u00e5f\u00f8re anden skade. <\/p>\n<p><b><\/p>\n<h3>L\u00f8sning: Enhedlig identitetskontrol<\/h3>\n<p><\/b><br \/>\nS\u00e5rbarhederne i det unders\u00f8gte NPN 5G-netv\u00e6rk er en konsekvens af fragmenterede sikkerhedsprocedurer p\u00e5 kommunikationsniveauet, SIM-kortniveauet og enhedsniveauet samt p\u00e5 niveauet for roaminginteraktion mellem netv\u00e6rk. For at l\u00f8se dette problem er det n\u00f8dvendigt at sikre autentificering af de enheder, der tilslutter sig netv\u00e6rket p\u00e5 hvert trin, i overensstemmelse med nul tillidsprincippet (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.paloaltonetworks.com\/cyberpedia\/what-is-a-zero-trust-architecture\">Zero-Trust Architecture, ZTA<\/a><\/noindex>) ved at implementere en f\u00f8derativ model for identifikation og adgangsstyring (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.securityforum.org\/uploads\/2015\/03\/isf_fiam_es.pdf\">Federated Identity and Access Management, FIdAM<\/a><\/noindex>).<\/p>\n<p>ZTA-princippet g\u00e5r ud p\u00e5 at opretholde sikkerheden, selv n\u00e5r enheden er ukontrolleret, bev\u00e6ger sig eller er udenfor netv\u00e6rkets gr\u00e6nser. Den f\u00f8derative identifikationsmodel er en tilgang til sikkerhed for 5G, der sikrer en ensartet arkitektur til autentificering, adgangsretter, dataintegritet og andre komponenter og teknologier i 5G-netv\u00e6rk.<\/p>\n<p>Denne tilgang udelukker muligheden for at inds\u00e6tte et \"roaming\" t\u00e5rn i netv\u00e6rket og omdirigere fangede SIM-kort til det. IT-systemer vil v\u00e6re i stand til fuldt ud at identificere forbindelsen af fremmede enheder og blokere parasitisk trafik, der skaber statistisk st\u00f8j. <\/p>\n<p>For the protection of the SIM card against modification, additional integrity verification tools need to be implemented, possibly in the form of a SIM application based on blockchain. The application can be used for authenticating devices and users, as well as for verifying the integrity of the firmware and settings of the SIM card both in roaming and when operating in the home network. <br \/>\n<img decoding=\"async\" alt=\"S\u00e5rbarheder i 5G-netv\u00e6rk\" src=\"\/wp-content\/uploads\/2020\/02\/47b5019c69ea78b1db54e0971681b6f4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\n<b><\/p>\n<h3>To summarize<\/h3>\n<p><\/b><br \/>\n The solution to the identified 5G security issues can be presented as a combination of three approaches: <\/p>\n<ul>\n<li>implementing a federated identity and access management model that ensures data integrity in the network;<\/li>\n<li>ensuring full visibility of threats through the implementation of a distributed ledger for verifying the legitimacy and integrity of SIM cards;<\/li>\n<li>forming a distributed borderless security system that addresses issues of interaction with devices in roaming. <\/li>\n<\/ul>\n<p>\nThe practical implementation of these measures requires time and significant costs; however, the deployment of 5G networks is happening everywhere, which means that work on addressing vulnerabilities needs to start right now.<br \/>\n<br \/>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/trendmicro\/blog\/486262\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u043a\u0430 \u044d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442\u044b \u0441 \u0442\u0440\u0435\u043f\u0435\u0442\u043e\u043c \u0436\u0434\u0443\u0442 \u043c\u0430\u0441\u0441\u043e\u0432\u043e\u0433\u043e \u0432\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0439 \u043f\u044f\u0442\u043e\u0433\u043e \u043f\u043e\u043a\u043e\u043b\u0435\u043d\u0438\u044f, \u043a\u0438\u0431\u0435\u0440\u043f\u0440\u0435\u0441\u0442\u0443\u043f\u043d\u0438\u043a\u0438 \u043f\u043e\u0442\u0438\u0440\u0430\u044e\u0442 \u0440\u0443\u043a\u0438, \u043f\u0440\u0435\u0434\u0432\u043a\u0443\u0448\u0430\u044f \u043d\u043e\u0432\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0434\u043b\u044f \u043d\u0430\u0436\u0438\u0432\u044b. \u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0432\u0441\u0435 \u0441\u0442\u0430\u0440\u0430\u043d\u0438\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f 5G \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043e\u0441\u043b\u043e\u0436\u043d\u044f\u0435\u0442\u0441\u044f \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u043e\u043f\u044b\u0442\u0430 \u0440\u0430\u0431\u043e\u0442\u044b \u0432 \u043d\u043e\u0432\u044b\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445. \u041c\u044b \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043b\u0438 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0443\u044e 5G-\u0441\u0435\u0442\u044c \u0438 \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0442\u0440\u0438 \u0442\u0438\u043f\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043e \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0435\u043c \u0432 \u044d\u0442\u043e\u043c \u043f\u043e\u0441\u0442\u0435. \u041e\u0431\u044a\u0435\u043a\u0442 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0439 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