{"id":1575,"date":"2015-07-22T03:30:24","date_gmt":"2015-07-22T03:30:24","guid":{"rendered":"http:\/\/nethemba.com\/cs\/?p=1575"},"modified":"2016-01-30T08:28:32","modified_gmt":"2016-01-30T08:28:32","slug":"nove-sluzby-proti-nejen-statni-asymetrii","status":"publish","type":"post","link":"https:\/\/nethemba.com\/cs\/nove-sluzby-proti-nejen-statni-asymetrii\/","title":{"rendered":"Nov\u00e9 slu\u017eby proti (nejen st\u00e1tn\u00ed) asymetrii"},"content":{"rendered":"<p>P\u0159esto, \u017ee sv\u00fdm klient\u016fm ji\u017e v\u00edce ne\u017e rok nab\u00edz\u00edme komplexn\u00ed slu\u017eby <a href=\"http:\/\/www.chrantesvesoukromi.cz\/\">ochrany digit\u00e1ln\u00edho soukrom\u00ed<\/a> a umo\u017e\u0148ujeme jim kompletn\u011b za\u0161ifrovat jejich hlasovou nebo instantn\u00ed komunikaci v\u016f\u010di odposlechu a taky pln\u011b za\u0161ifrovat jimi pou\u017e\u00edvan\u00e9 \u00falo\u017ei\u0161t\u011b, v situaci, kdy st\u00e1tn\u00ed agentury investuj\u00ed nemal\u00e9 pen\u00edze do n\u00e1kupu a pou\u017e\u00edv\u00e1n\u00ed 0-day sledovac\u00edho malwaru (v\u016f\u010di n\u011bmu\u017e je prakticky nemo\u017en\u00e9 se br\u00e1nit p\u0159i neexistenci bezpe\u010dnostn\u00edch z\u00e1plat), mus\u00edme s v\u00e1\u017en\u00fdmi obavami konstatovat, \u017ee <strong>nedok\u00e1\u017eeme v t\u00e9to situaci pln\u011b ochr\u00e1nit na\u0161<\/strong><strong>e<\/strong><strong> klient<\/strong><strong>y<\/strong> (a nejen my, ale jak\u00e1koliv jin\u00e1 sv\u011btov\u00e1 bezpe\u010dnostn\u00ed firma). V\u00edce informac\u00ed v na\u0161em posledn\u00edm blogu <a href=\"https:\/\/www.nethemba.com\/blog\/-\/blogs\/mate-strach-o-vase-sukromie-bojte-sa-sis-\">M\u00e1te strach o Va\u0161e soukrom\u00ed? Bojte se SIS<\/a>.<\/p>\n<p>Existence uveden\u00e9ho malwaru v rukou (nejen) st\u00e1tn\u00edch agentur vytv\u00e1\u0159\u00ed extr\u00e9mn\u011b silnou asymetrii mezi ob\u010dany a samotn\u00fdm st\u00e1tem, kter\u00fd m\u00e1 dostate\u010dn\u011b mnoho finan\u010dn\u00edch prost\u0159edk\u016f na koupi tohoto malwaru a jeho vyu\u017eit\u00ed pro z\u00edsk\u00e1n\u00ed p\u0159\u00edstupu prakticky na libovoln\u00e9m za\u0159\u00edzen\u00ed \u010dlov\u011bka pro kter\u00fd existuje 0-day exploit (nutno podotknout, \u017ee dosud byly ob\u011b\u0165mi nap\u0159\u00edklad v\u0161ichni lid\u00e9, kte\u0159\u00ed v prohl\u00ed\u017ee\u010d\u00edch pou\u017e\u00edvali flash, co\u017e znamen\u00e1 v p\u0159ekladu, \u017ee &#8222;prakticky v\u0161ichni&#8220;).<\/p>\n<p>Ve spolupr\u00e1ci s na\u0161imi extern\u00edmi bezpe\u010dnostn\u00edmi experty na technologie GSM \/ 3G \/ Android ze spole\u010dnosti ITDS Consulting jsme se rozhodli na uvedenou asymetrii zareagovat a poskytnout na\u0161im klient\u016fm slu\u017eby, d\u00edky kter\u00fdm ji dok\u00e1\u017e\u00ed zm\u00edrnit a do slu\u0161n\u00e9 m\u00edry se br\u00e1nit odposlechu (nap\u0159\u00edklad odhalit sv\u00e9 p\u0159\u00edpadn\u00e9 odposlouch\u00e1v\u00e1n\u00ed IMSI catcher), jako\u017e i v\u00fdrazn\u011b nav\u00fd\u0161it bezpe\u010dnost sv\u00fdch mobiln\u00edch telefon\u016f (nap\u0159\u00edklad o bezpe\u010dn\u00fd a ov\u011b\u0159en\u00fd extern\u00ed GSM modul, speci\u00e1ln\u00ed \u00fapravu displeje apod).<\/p>\n<p>Podle ned\u00e1vn\u00e9 studie <a href=\"http:\/\/www.ivo.sk\/7764\/sk\/aktuality\/slovensko-druhe-v-slobode-internetu-v-ramci-v4\">Institutu pro ve\u0159ejn\u00e9 ot\u00e1zky<\/a> <a href=\"http:\/\/www.ivo.sk\/buxus\/docs\/\/vyskum\/subor\/Internet_freedom_report_2014-Slovakia.pdf\">Internet Freedom Report 2014: Slovakia<\/a>, v roce 2012 slovensk\u00e1 policie zadala 1551 \u017e\u00e1dost\u00ed o odposlech, z nich\u017e byly schv\u00e1leny prakticky v\u0161echny (1489), ale jen 59 bylo re\u00e1ln\u011b pou\u017eito v n\u011bjak\u00e9m soudn\u00edm procesu (to je m\u00e9n\u011b ne\u017e 4%). Znamen\u00e1 to, \u017ee riziko nelegitimn\u00edho odposlechu (kdy nebyl sp\u00e1ch\u00e1n \u017e\u00e1dn\u00fd trestn\u00fd \u010din) je jako vid\u00edme velmi vysok\u00e9 a je dobr\u00e9 se v\u016f\u010di n\u011bmu br\u00e1nit.<\/p>\n<h4><strong>Bezpe\u010dn\u00fd Android<\/strong><\/h4>\n<p>Realizujeme vysoce bezpe\u010dn\u00e9 otev\u0159en\u00e9 a transparentn\u00ed \u0159e\u0161en\u00ed pro bezpe\u010dnou komunikaci:<\/p>\n<ul>\n<li>postaveno na alternativn\u00ed CyanogenMod distribuci<\/li>\n<li>\u0161ifrovan\u00e9 hovory s vyu\u017eit\u00edm ZRTP, pou\u017eit\u00edm otev\u0159en\u00e9ho klienta Linphone nebo CSIPSimple<\/li>\n<li>vlastn\u00ed VoIP \u00fast\u0159edna postaven\u00e1 na FreeSWITCH \/ Kamailio SIP serveru. Server je chr\u00e1n\u011bn v\u016f\u010di nelegitimn\u00ed otev\u0159en\u00ed (detekce otev\u0159en\u00ed krytu) s &#8222;full disk&#8220; encryption, p\u0159\u00edstup p\u0159es remote management<\/li>\n<li>Extra bezpe\u010dn\u00e9 voliteln\u00e9 mo\u017enosti\n<ul>\n<li>pou\u017eit\u00ed extern\u00edho GSM modulu, kter\u00fd umo\u017e\u0148uje obej\u00edt p\u0159\u00edmou komunikaci RAP a UAP (lze propojit i na tablet bez GSM modulu), z\u00e1rove\u0148 zabezpe\u010duje proti exploitaci proti firmware ze strany oper\u00e1tora nebo nasazen\u00ed backdoor od v\u00fdrobce GSM modul\u016f<\/li>\n<li>ochrana v\u016f\u010di odposlechu a sledov\u00e1n\u00ed telefonn\u00edho displeje (3M f\u00f3lie limituj\u00edc\u00ed zorn\u00e9 \u00fahly displeje)<\/li>\n<li>implementace &#8222;killswitch&#8220; (smaz\u00e1n\u00ed v\u0161ech citliv\u00fdch \u00fadaj\u016f na telefonu prost\u0159ednictv\u00edm zad\u00e1n\u00ed speci\u00e1ln\u00edho odemykac\u00edho k\u00f3du p\u0159i startu nebo odemyk\u00e1n\u00ed obrazovky)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Standardn\u00ed AirGap anal\u00fdza telefon\u016f<\/strong><\/h4>\n<p>Anal\u00fdza napadnutelnosti a\/nebo odolnosti telefonu proti napaden\u00ed IMSI catcherem<\/p>\n<ul>\n<li>Anal\u00fdza funkc\u00ed dostupn\u00fdch pro konkr\u00e9tn\u00ed implementace GSM Um Interface (Air Interface) \/ RAP, v\u010detn\u011b detekce nebezpe\u010dn\u00fdch funkc\u00ed (jako je nap\u0159. Silent call i za vypnut\u00e9ho telefonu, Silent SMS)<\/li>\n<li>Fuzzing \/ Jamming Um Interface (SMS of Death, SMS Fuzzing, remote brick, \u2026)<\/li>\n<li>Napaden\u00ed pomoc\u00ed konfigura\u010dn\u00ed SMS<\/li>\n<li>Napaden\u00ed WIFI komunikace\n<ul>\n<li>Anal\u00fdza nebezpe\u010dn\u00fdch informac\u00ed dostupn\u00fdch poskytovateli WIFI a jejich mo\u017en\u00e9 zneu\u017eit\u00ed<\/li>\n<li>Podvr\u017een\u00ed SSL certifik\u00e1t\u016f aplika\u010dn\u00ed vrstv\u011b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Detailn\u00ed anal\u00fdza Android telefon\u016f<\/strong><\/p>\n<ul>\n<li>Zahrnuje <a href=\"https:\/\/www.nethemba.com\/standardni-airgap-analyza-telefonu\">standardn\u00ed AirGap anal\u00fdzu<\/a><\/li>\n<li>Kontrola pou\u017eit\u00e9ho software, hardware, ovlada\u010d\u016f (p\u0159i podez\u0159en\u00ed na hw odposlouch\u00e1van\u00fd telefon)\n<ul>\n<li>Ozna\u010den\u00ed a\/nebo odstran\u011bn\u00ed potenci\u00e1ln\u011b z\u00e1vadn\u00e9ho software, p\u0159\u00edpadn\u011b nahrazen\u00ed nebezpe\u010dn\u00e9ho software otev\u0159en\u00fdm \u0159e\u0161en\u00edm (hlasov\u00e1\/textov\u00e1 komunikace, spr\u00e1va e-mail\u016f, kl\u00ed\u010d\u016f, \u0161ifrovan\u00e9 \u00falo\u017ei\u0161t\u011b)<\/li>\n<li>Kontrola hardware a nestandardn\u00edho \u00faniku informac\u00ed (vyza\u0159ov\u00e1n\u00ed ve vybran\u00fdch oblastech r\u00e1diov\u00e9ho spektra, ukl\u00e1d\u00e1n\u00ed dat na ne\u0161ifrovan\u00e9 \u00falo\u017ei\u0161t\u011b, napadnutelnost skrze s\u00e9riov\u00fd port v audio jacku nebo usb konektoru, &#8230;)<\/li>\n<\/ul>\n<\/li>\n<li>Kontrola zabezpe\u010den\u00ed odchoz\u00ed komunikace (jak WIFI tak 1-4G\/LTE)\n<ul>\n<li>Referen\u010dn\u00ed kontrola pou\u017eit\u00ed nebo nepou\u017eit\u00ed \u0161ifrov\u00e1n\u00ed p\u0159enosu k nejbli\u017e\u0161\u00ed BTS<\/li>\n<li>Anal\u00fdza nezabezpe\u010den\u00e9ho provozu po mobiln\u00ed datov\u00fdch s\u00edt\u00edch a wifi<\/li>\n<li>Nasazen\u00ed firewallu pro plnou kontrolu nad datov\u00fdmi p\u0159enosy<\/li>\n<li>Nasazen\u00ed Auditn\u00edho \u0159e\u0161en\u00ed pro mo\u017enou forenzn\u00ed anal\u00fdzu chov\u00e1n\u00ed telefonu Kontrola zabezpe\u010den\u00ed bootloader \/ recovery \/ factory a \u0161ifrov\u00e1n\u00ed dat<\/li>\n<li>Zji\u0161t\u011bn\u00ed ne\u0161ifrovan\u00e9ho \u00falo\u017ei\u0161t\u011b dat, p\u0159\u00edpadn\u011b nestandardn\u00edho zavad\u011b\u010de, factory nebo recovery slo\u017eek<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Ve\u0159ejn\u00fd sponzorovan\u00fd v\u00fdzkum &#8211; Anal\u00fdza zabezpe\u010den\u00ed UMTS \/ UTRA Air Interface<\/strong><\/p>\n<p>Nez\u00e1visle na tom, jak\u00fd opera\u010dn\u00ed syst\u00e9m m\u00e1te v telefonu (Android, iOS, Blackberry, Windows Phone), z bezpe\u010dnostn\u00edho hlediska nejcitliv\u011bj\u0161\u00ed komponent p\u0159edstavuje tzv. &#8222;GSM baseband&#8220;, kter\u00fd m\u00e1 na starosti samotnou komunikaci va\u0161eho telefonu na fyzick\u00e9 \/ linkov\u00e9 \u00farovni i p\u0159\u00edpadn\u00e9 \u0161ifrov\u00e1n\u00ed (A5 \/ 1, A5 \/ 3). Jedn\u00e1 se toti\u017e obvykle o prudce propriet\u00e1rn\u00ed komponent, kter\u00fd vyr\u00e1b\u00ed a distribuuje pouze p\u00e1r firem na sv\u011bt\u011b a existuje v\u00e1\u017en\u00e9 podez\u0159en\u00ed, \u017ee GSM baseband m\u016f\u017ee obsahovat velk\u00e9 mno\u017estv\u00ed zranitelnosti a potenci\u00e1ln\u00edch &#8222;backdoor&#8220; (zadn\u00edch vr\u00e1tek) vyu\u017e\u00edvan\u00fdch r\u016fzn\u00fdmi \u00fato\u010dn\u00edky. N\u011bkter\u00e9 implementace GSM baseband-u umo\u017e\u0148uj\u00ed p\u0159ijmout nap\u0159\u00edklad tzv &#8222;silent call&#8220; (odposlech) i v situaci, kdy je dan\u00e9 mobiln\u00ed za\u0159\u00edzen\u00ed vypnuto.<br \/>\nProto\u017ee moment\u00e1ln\u011b je\u0161t\u011b neexistuje \u017e\u00e1dn\u00e1 ve\u0159ejn\u00e1 otev\u0159en\u00e1 anal\u00fdza a srovn\u00e1n\u00ed bezpe\u010dnosti GSM baseband-u b\u011b\u017en\u011b prod\u00e1van\u00fdch telefon\u016f, rozhodli jsme se finan\u010dn\u011b podpo\u0159it uveden\u00fd v\u00fdzkum a vytvo\u0159it ho pro p\u00e1r nejpou\u017e\u00edvan\u011bj\u0161\u00edch telefon\u016f.<\/p>\n<h4><strong>C\u00edlem v\u00fdzkumu je pro dan\u00fd testovan\u00fd mobiln\u00ed telefon zjistit:<\/strong><\/h4>\n<p>1. Jak\u00e9 funkce implementuje konkr\u00e9tn\u00edho GSM baseband v dan\u00e9m telefonu (p\u0159edev\u0161\u00edm n\u00e1s zaj\u00edmaj\u00ed takov\u00e9, kter\u00e9 ohro\u017euj\u00ed bezpe\u010dnost \/ soukrom\u00ed)<br \/>\n2. Zda je mo\u017en\u00e9 v telefonu na d\u00e1lku spustit silent call (odposlech) b\u011bhem toho kdy je dan\u00e9 za\u0159\u00edzen\u00ed vypnuto \/ zapnuto<br \/>\n3. Zda za\u0159\u00edzen\u00ed automaticky p\u0159ij\u00edm\u00e1 konfigura\u010dn\u00ed SMS (nap\u0159\u00edklad p\u0159esm\u011brov\u00e1n\u00ed mobiln\u00ed datov\u00e9 komunikace na kontrolovan\u00e9 APN)<br \/>\n4. Zda je za\u0159\u00edzen\u00ed odoln\u00e9 v\u016f\u010di IMSI catcher a zda dok\u00e1\u017ee u\u017eivatel tuto informaci zjistit (pomoc\u00ed AIMSICD \/ Snoopsnitch)<br \/>\nV\u00fdsledky tohoto v\u00fdzkumu budou ve\u0159ejn\u00e9 a budeme o nich v dohledn\u00e9 dob\u011b informovat.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>P\u0159esto, \u017ee sv\u00fdm klient\u016fm ji\u017e v\u00edce ne\u017e rok nab\u00edz\u00edme komplexn\u00ed slu\u017eby ochrany digit\u00e1ln\u00edho soukrom\u00ed a umo\u017e\u0148ujeme jim kompletn\u011b za\u0161ifrovat jejich hlasovou nebo instantn\u00ed komunikaci v\u016f\u010di odposlechu a taky pln\u011b za\u0161ifrovat jimi pou\u017e\u00edvan\u00e9 \u00falo\u017ei\u0161t\u011b, v situaci, kdy st\u00e1tn\u00ed agentury investuj\u00ed nemal\u00e9 pen\u00edze do n\u00e1kupu a pou\u017e\u00edv\u00e1n\u00ed 0-day sledovac\u00edho malwaru (v\u016f\u010di n\u011bmu\u017e je prakticky nemo\u017en\u00e9 se br\u00e1nit [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-1575","post","type-post","status-publish","format-standard","hentry","category-uncategorized-cs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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