{"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\/ro\/blog\/uyazvimosti-setej-5g","title":{"rendered":"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/656548e68c974d920250349994b24721.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>\u00cen timp ce entuzia\u0219tii a\u0219teapt\u0103 cu ner\u0103bdare implementarea pe scar\u0103 larg\u0103 a re\u021belelor de genera\u021bie a cincea, infractorii cibernetici \u00ee\u0219i freac\u0103 m\u00e2inile, anticip\u00e2nd noi oportunit\u0103\u021bi pentru c\u00e2\u0219tiguri. \u00cen ciuda tuturor eforturilor dezvoltatorilor, tehnologia 5G con\u021bine vulnerabilit\u0103\u021bi, iar identificarea acestora este complicat\u0103 de lipsa experien\u021bei \u00een condi\u021bii noi. Am cercetat o mic\u0103 re\u021bea 5G \u0219i am descoperit trei tipuri de vulnerabilit\u0103\u021bi, despre care vom discuta \u00een aceast\u0103 postare. <\/i><br \/>\n <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Obiectul cercet\u0103rii<\/h3>\n<p>\nS\u0103 lu\u0103m \u00een considerare un exemplu simplu \u2014 o re\u021bea 5G nepublic\u0103 de model dintr-un campus studen\u021besc (Non-Public Network, NPN), conectat\u0103 la lume prin canale de comunica\u021bie publice. Exact aceste tipuri de re\u021bele vor fi folosite \u00een viitor ca standard \u00een toate \u021b\u0103rile care s-au implicat \u00een cursa pentru 5G. Mediul poten\u021bial de implementare pentru re\u021bele de aceast\u0103 configura\u021bie sunt \u00eentreprinderile \u201einteligente\u201d, ora\u0219ele \u201einteligente\u201d, birourile marilor companii \u0219i alte loca\u021bii similare cu un grad ridicat de control. <\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/266e447d122674db9fc694ff86b4bcdd.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <i>Infrastructura NPN: o re\u021bea \u00eenchis\u0103 a unei \u00eentreprinderi conectat\u0103 la re\u021beaua global\u0103 5G prin canale publice. Sursa: Trend Micro<\/i><\/p>\n<p>Spre deosebire de re\u021belele de genera\u021bie a patra, re\u021belele 5G sunt orientate spre procesarea datelor \u00een timp real, prin urmare arhitectura lor seam\u0103n\u0103 cu o pl\u0103cint\u0103 stratificat\u0103. Separarea pe niveluri faciliteaz\u0103 interac\u021biunea prin standardizarea API-urilor pentru interac\u021biunea \u00eentre straturi.<\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/4a6c70ab37b8a15ef32c14bba947bd65.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Compararea arhitecturilor 4G \u0219i 5G. Sursa: Trend Micro<\/i><\/p>\n<p>Rezultatul este o capacitate crescut\u0103 de automatizare \u0219i scalare, ceea ce este critic pentru procesarea unor volume uria\u0219e de informa\u021bii din internetul obiectelor (IoT).<br \/>\nIzolarea nivelurilor \u00een standardul 5G duce la o nou\u0103 problem\u0103: sistemele de securitate care func\u021bioneaz\u0103 \u00een interiorul re\u021belei NPN protejeaz\u0103 obiectul \u0219i cloudul s\u0103u privat, \u00een timp ce sistemele externe de securitate \u00ee\u0219i protejeaz\u0103 infrastructura intern\u0103. Totu\u0219i, traficul dintre NPN \u0219i re\u021belele externe este considerat sigur, deoarece provine din sisteme protejate, dar de fapt nu este protejat de nimeni. <\/p>\n<p>\u00cen cercetarea noastr\u0103 recent\u0103 <noindex><a rel=\"nofollow\" href=\"https:\/\/documents.trendmicro.com\/assets\/white_papers\/wp-securing-5g-through-cyber-telecom-identity-federation.pdf\">Asigurarea 5G prin federarea identit\u0103\u021bii cibernetico-telecom<\/a><\/noindex> prezent\u0103m c\u00e2teva scenarii de atacuri cibernetice asupra re\u021belelor 5G, care exploateaz\u0103:<\/p>\n<ul>\n<li>vulnerabilit\u0103\u021bile SIM-urilor,<\/li>\n<li>vulnerabilit\u0103\u021bile re\u021belei,<\/li>\n<li>vulnerabilit\u0103\u021bile sistemului de identificare.<\/li>\n<\/ul>\n<p>\nS\u0103 analiz\u0103m fiecare vulnerabilitate mai \u00een detaliu. <\/p>\n<h3>Vulnerabilit\u0103\u021bile SIM-urilor<\/h3>\n<p>\nSIM-ul reprezint\u0103 un dispozitiv complex, care include chiar un \u00eentreg set de aplica\u021bii \u00eencorporate \u2014 SIM Toolkit, STK. Una dintre aceste aplica\u021bii \u2014 S@T Browser \u2014 teoretic poate fi folosit\u0103 pentru a accesa site-uri interne ale operatorului, dar \u00een practic\u0103 a fost uitat\u0103 \u0219i nu a mai fost actualizat\u0103 din 2009, deoarece aceste func\u021bii sunt acum \u00eendeplinite de alte aplica\u021bii. <\/p>\n<p>Problema este c\u0103 S@T Browser s-a dovedit a fi vulnerabil: un SMS special preg\u0103tit poate sparge SIM-ul \u0219i \u00eel poate for\u021ba s\u0103 execute comenzi dorite de hacker, iar utilizatorul telefonului sau dispozitivului nu va observa nimic neobi\u0219nuit. Atacul a primit denumirea <noindex><a rel=\"nofollow\" href=\"https:\/\/simjacker.com\/downloads\/technicalpapers\/AdaptiveMobile_Security_Simjacker_Technical_Paper_v1.01.pdf\">Simjaker<\/a><\/noindex> \u0219i ofer\u0103 multe oportunit\u0103\u021bi infractorilor. <\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/d23b7f7a77838d76a881a40d721eabb7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Atacul Simjacking \u00een re\u021beaua 5G. Surs\u0103: Trend Micro<\/i><\/p>\n<p>\u00cen special, permite transmiterea datelor despre loca\u021bia abonatului, identificatorul dispozitivului s\u0103u (IMEI) \u0219i al turnului de telefonie mobil\u0103 (Cell ID), precum \u0219i for\u021barea telefonului s\u0103 formeze un num\u0103r, s\u0103 trimit\u0103 un SMS, s\u0103 deschid\u0103 un link \u00een browser \u0219i chiar s\u0103 dezactiveze SIM-ul. <\/p>\n<p>\u00cen condi\u021biile re\u021belelor 5G, aceast\u0103 vulnerabilitate a SIM-urilor devine o problem\u0103 serioas\u0103, av\u00e2nd \u00een vedere num\u0103rul mare de dispozitive conectate. De\u0219i <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 a dezvoltat noi standarde pentru SIM-uri pentru 5G cu un nivel mai ridicat de securitate<\/a><\/noindex>, \u00een re\u021belele de genera\u021bie a cincea totu\u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ericsson.com\/en\/blog\/2020\/1\/5g-security-sim-card\">este posibil\u0103 utilizarea SIM-urilor 'vechi'<\/a><\/noindex>. \u0218i av\u00e2nd \u00een vedere c\u0103 totul func\u021bioneaz\u0103 deja, nu se pot a\u0219tepta \u00eenlocuiri rapide ale SIM-urilor existente. <\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/208833a443e53b03c07f415476144a4b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Utilizarea r\u0103u inten\u021bionat\u0103 a roaming-ului. Surs\u0103: Trend Micro<\/i><\/p>\n<p>Utilizarea Simjacking-ului permite for\u021barea SIM-ului s\u0103 treac\u0103 \u00een modul de roaming \u0219i s\u0103 se conecteze la turnul de telefonie mobil\u0103 controlat de infractor. Astfel, atacatorul va avea posibilitatea de a modifica set\u0103rile SIM-ului pentru a intercepta apelurile telefonice, a introduce software mali\u021bios \u0219i a efectua diverse tipuri de atacuri folosind dispozitivul care con\u021bine SIM-ul spart. Acest lucru este posibil datorit\u0103 faptului c\u0103 interac\u021biunea cu dispozitivele \u00een roaming se desf\u0103\u0219oar\u0103 ocolind procedurile de securitate implementate pentru dispozitivele din re\u021beaua 'de acas\u0103'. <\/p>\n<h3>Vulnerabilit\u0103\u021bile re\u021belei <\/h3>\n<p>\nAtacatorii pot modifica set\u0103rile unei cartele SIM compromise pentru a-\u0219i \u00eendeplini scopurile. U\u0219urin\u021ba relativ\u0103 \u0219i discre\u021bia atacului Simjaking permit desf\u0103\u0219urarea acestuia pe o baz\u0103 constant\u0103, captur\u00e2nd controlul asupra tot mai multor dispozitive, lent \u0219i cu r\u0103bdare (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflare.com\/learning\/ddos\/ddos-low-and-slow-attack\/\">atac lent \u0219i ascuns<\/a><\/noindex>) t\u0103ind buc\u0103\u021bi din re\u021bea, asemenea unor felii de salam (<noindex><a rel=\"nofollow\" href=\"https:\/\/ajmaurya.wordpress.com\/2014\/03\/27\/what-is-a-salami-attack\/\">atac cu salam<\/a><\/noindex>). Monitorizarea unei astfel de activit\u0103\u021bi este extrem de dificil\u0103, iar \u00een condi\u021biile unei re\u021bele complexe distribuite 5G \u2014 practic imposibil\u0103. <\/p>\n<p><img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/36e5f0da189c645567d97eeefa3643de.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Implementarea gradual\u0103 \u00een re\u021beaua 5G folosind atacuri Low and Slow + Salami. Surse: Trend Micro<\/i><\/p>\n<p>\u0218i, deoarece re\u021belele 5G nu dispun de mecanisme de control al securit\u0103\u021bii cartelelor SIM, atacatorii vor c\u00e2\u0219tiga treptat capacitatea de a stabili propriile reguli \u00een cadrul domeniului de comunica\u021bie 5G, folosind cartele SIM capturate pentru furt de fonduri, autorizarea la nivel de re\u021bea, instalarea de malware \u0219i alte activit\u0103\u021bi ilegale. <\/p>\n<p>O preocupare special\u0103 este apari\u021bia pe forumurile hackerilor a instrumentelor care automatizeaz\u0103 captura cartelelor SIM prin Simjaking, deoarece utilizarea unor astfel de instrumente pentru re\u021belele de genera\u021bia a cincea le ofer\u0103 atacatorilor practic oportunit\u0103\u021bi nelimitate de a scala atacurile \u0219i de a modifica traficul de \u00eencredere. <\/p>\n<p><b><\/p>\n<h3>Vulnerabilit\u0103\u021bile de identificare<\/h3>\n<p><\/b><br \/>\nCartela SIM este folosit\u0103 pentru identificarea dispozitivului \u00een re\u021bea. Dac\u0103 cartela SIM este activ\u0103 \u0219i are un sold pozitiv, dispozitivul este automat considerat legitim \u0219i nu ridic\u0103 suspiciuni la nivelul sistemelor de detectare. \u00centre timp, vulnerabilitatea \u00eens\u0103\u0219i a cartelei SIM face \u00eentreaga sistem de identificare vulnerabil. Sistemele IT de securitate pur \u0219i simplu nu vor putea urm\u0103ri un dispozitiv conectat ilegal, dac\u0103 acesta se registreaz\u0103 \u00een re\u021bea cu ajutorul datelor de identificare furate prin Simjaking. <\/p>\n<p>Astfel, un hacker conectat la re\u021bea printr-o cartel\u0103 SIM spart\u0103 ob\u021bine acces la nivelul realului proprietar, deoarece sistemele IT nu mai verific\u0103 dispozitivele care au fost identificate la nivel de re\u021bea. <\/p>\n<p>Identificarea garantat\u0103 \u00eentre nivelul software \u0219i nivelul re\u021belei adaug\u0103 o alt\u0103 problem\u0103: criminalii pot crea inten\u021bionat \u201ezgomot\u201d pentru sistemele de detectare a intruziunilor, desf\u0103\u0219ur\u00e2nd constant diverse ac\u021biuni suspecte \u00een numele dispozitivelor legitime capturate. Deoarece func\u021bionarea sistemelor automate de detectare se bazeaz\u0103 pe analiza statisticilor, treptat, pragurile pentru semnalele de alarm\u0103 se vor cre\u0219te, asigur\u00e2nd lipsa de reac\u021bie la atacuri reale. Expunerea prelungit\u0103 la astfel de fenomene poate schimba \u00een totalitate func\u021bionarea re\u021belei \u0219i poate crea \u201ezone oarbe\u201d statistice pentru sistemele de detectare. Criminalii care controleaz\u0103 aceste zone pot desf\u0103\u0219ura atacuri asupra datelor din re\u021bea \u0219i asupra dispozitivelor fizice, pot organiza atacuri de tip denial of service \u0219i pot provoca alte daune. <\/p>\n<p><b><\/p>\n<h3>Solu\u021bia: verificarea unificat\u0103 a identit\u0103\u021bii<\/h3>\n<p><\/b><br \/>\nVulnerabilit\u0103\u021bile re\u021belei NPN 5G studiate sunt rezultatul fragment\u0103rii procedurilor de securitate la nivelul comunica\u021biilor, al cardurilor SIM \u0219i al dispozitivelor, precum \u0219i la nivelul interac\u021biunii de roaming \u00eentre re\u021bele. Pentru a rezolva aceast\u0103 problem\u0103, este necesar, conform principiului zero-trust (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.paloaltonetworks.com\/cyberpedia\/what-is-a-zero-trust-architecture\">Zero-Trust Architecture, ZTA<\/a><\/noindex>), s\u0103 se asigure autenticitatea dispozitivelor care se conecteaz\u0103 la re\u021bea \u00een fiecare etap\u0103, implement\u00e2nd un model federativ de identificare \u0219i gestionare a accesului (<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>Principiul ZTA const\u0103 \u00een men\u021binerea securit\u0103\u021bii \u0219i atunci c\u00e2nd dispozitivul este necontrolat, se deplaseaz\u0103 sau se afl\u0103 \u00een afara perimetrului re\u021belei. Modelul de identificare federativ este o abordare a securit\u0103\u021bii 5G care asigur\u0103 o arhitectur\u0103 uniform\u0103 pentru autentificare, drepturi de acces, integritate a datelor \u0219i alte componente \u0219i tehnologii \u00een re\u021belele 5G.<\/p>\n<p>Aceast\u0103 abordare elimin\u0103 posibilitatea de a introduce \u00een re\u021bea o \u201eturn de roaming\u201d \u0219i de a redirec\u021biona SIM-urile capturate. Sistemele IT vor putea detecta complet conectarea dispozitivelor externe \u0219i bloca traficul parazitar care genereaz\u0103 zgomot statistic. <\/p>\n<p>Pentru a proteja SIM-ul \u00eempotriva modific\u0103rilor, este necesar s\u0103 se integreze \u00een acesta suplimente de verificare a integrit\u0103\u021bii, care pot fi implementate sub forma unei aplica\u021bii SIM bazate pe blockchain. Aplica\u021bia poate fi utilizat\u0103 pentru autentificarea dispozitivelor \u0219i utilizatorilor, precum \u0219i pentru verificarea integrit\u0103\u021bii firmware-ului \u0219i set\u0103rilor SIM-ului at\u00e2t \u00een roaming, c\u00e2t \u0219i \u00een re\u021beaua de acas\u0103. <br \/>\n<img decoding=\"async\" alt=\"Vulnerabilit\u0103\u021bi ale re\u021belelor 5G\" src=\"\/wp-content\/uploads\/2020\/02\/47b5019c69ea78b1db54e0971681b6f4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n <br \/>\n<b><\/p>\n<h3>S\u0103 rezum\u0103m<\/h3>\n<p><\/b><br \/>\n Solu\u021bionarea problemelor de securitate identificate \u00een 5G poate fi reprezentat\u0103 printr-o combina\u021bie de trei abord\u0103ri: <\/p>\n<ul>\n<li>implementarea unui model federativ de identificare \u0219i control al accesului, care va asigura integritatea datelor \u00een re\u021bea;<\/li>\n<li>asigurarea unei vizibilit\u0103\u021bi complete asupra amenin\u021b\u0103rilor prin implementarea unui registru distribuit pentru verificarea legitimit\u0103\u021bii \u0219i integrit\u0103\u021bii SIM-urilor;<\/li>\n<li>formarea unui sistem de securitate distribuit f\u0103r\u0103 frontiere, care abordeaz\u0103 problemele de interac\u021biune cu dispozitivele \u00een roaming. <\/li>\n<\/ul>\n<p>\nImplementarea practic\u0103 a acestor m\u0103suri necesit\u0103 timp \u0219i investi\u021bii considerabile, \u00eens\u0103 desf\u0103\u0219urarea re\u021belelor 5G avanseaz\u0103 pretutindeni, ceea ce \u00eenseamn\u0103 c\u0103 trebuie s\u0103 \u00eenceap\u0103 lucr\u0103rile de remediere a vulnerabilit\u0103\u021bilor imediat.<br \/>\n<br \/>Sursa: <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 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