{"id":100142,"date":"2021-05-12T10:22:35","date_gmt":"2021-05-12T08:22:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi"},"modified":"2021-05-12T10:22:35","modified_gmt":"2021-05-12T08:22:39","slug":"fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","title":{"rendered":"FragAttacks \u2014 o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mathy Vanhoef, autorul atacului KRACK asupra re\u021belelor wireless, a dezv\u0103luit informa\u021bii despre 12 vulnerabilit\u0103\u021bi care afecteaz\u0103 diferite dispozitive wireless. Problemele identificate sunt prezentate sub numele de cod FragAttacks \u0219i acoper\u0103 practic toate pl\u0103cile \u0219i punctele de acces wireless aflate \u00een uz &#8212; din cele 75 de dispozitive testate, fiecare a fost vulnerabil la cel pu\u021bin una dintre metodele de atac propuse.     <\/p>\n<p>Problemele sunt \u00eemp\u0103r\u021bite \u00een dou\u0103 categorii: 3 vulnerabilit\u0103\u021bi identificate direct \u00een standardele Wi-Fi care afecteaz\u0103 toate dispozitivele care suport\u0103 cele mai recente standarde IEEE 802.11 (problemele sunt prezente \u00eenc\u0103 din 1997). 9 vulnerabilit\u0103\u021bi se refer\u0103 la erori \u0219i neajunsuri \u00een implement\u0103rile specifice ale stivelor wireless. Cea de-a doua categorie prezint\u0103 cel mai mare pericol, deoarece organizarea atacurilor pe baza neajunsurilor standardelor necesit\u0103 set\u0103ri specifice sau ac\u021biuni din partea victimei. Toate vulnerabilit\u0103\u021bile se manifest\u0103 indiferent de utilizarea protocoalelor de securitate Wi-Fi, inclusiv \u00een cazul utiliz\u0103rii WPA3.    <\/p>\n<p>Majoritatea metodelor de atac identificate permit atacatorului s\u0103 efectueze substituirea cadrelor L2 \u00een re\u021beaua protejat\u0103, ceea ce ofer\u0103 posibilitatea de a interfera cu traficul victimei. Un scenariu de atac men\u021bionat ca fiind cel mai realist este falsificarea r\u0103spunsurilor DNS pentru a redirec\u021biona utilizatorul c\u0103tre gazda atacatorului. De asemenea, este dat un exemplu de utilizare a vulnerabilit\u0103\u021bilor pentru a ocoli translatorul de adrese pe un router wireless \u0219i pentru a organiza accesul direct la dispozitiv \u00een re\u021beaua local\u0103 sau a ignora restric\u021biile firewall-ului. A doua parte a vulnerabilit\u0103\u021bilor, legat\u0103 de procesarea cadrelor fragmentate, permite extragerea datelor despre traficul \u00een re\u021beaua wireless \u0219i interceptarea datelor utilizatorilor transmise f\u0103r\u0103 utilizarea cript\u0103rii.     <\/p>\n<p>Un investigator a preg\u0103tit o demonstra\u021bie care arat\u0103 cum pot fi folosite vulnerabilit\u0103\u021bile pentru a intercepta parola transmis\u0103 atunci c\u00e2nd un site este accesat prin protocolul HTTP f\u0103r\u0103 criptare. De asemenea, este prezentat modul de atacare a unei prize inteligente controlate prin Wi-Fi \u0219i utilizarea acesteia ca un punct de plecare pentru continuarea atacului asupra dispozitivelor neactualizate din re\u021beaua local\u0103, care au vulnerabilit\u0103\u021bi nerezolvate (de exemplu, s-a reu\u0219it, printr-o ocolire NAT, atacarea unui calculator cu Windows 7 neactualizat \u00een re\u021beaua intern\u0103).            <center><div class=\"youtube-placeholder\" data-id=\"88YZ4061tYw\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/88YZ4061tYw\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center>    <\/p>\n<p>Pentru a exploata vulnerabilit\u0103\u021bile, atacatorul trebuie s\u0103 se afle \u00een raza de acoperire a dispozitivului wireless \u021bint\u0103 pentru a trimite victimei un set de cadre special conceput. Problemele afecteaz\u0103 at\u00e2t dispozitivele client, c\u00e2t \u0219i pl\u0103cile de re\u021bea wireless, precum \u0219i punctele de acces \u0219i routerele Wi-Fi. \u00cen general, ca m\u0103sur\u0103 de protec\u021bie, este suficient s\u0103 se utilizeze HTTPS \u00eempreun\u0103 cu criptarea traficului DNS prin DNS over TLS sau DNS over HTTPS. De asemenea, este adecvat\u0103 aplicarea <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/ro\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"162\">VPN<\/a>.     <\/p>\n<p>Cele mai periculoase sunt considerate patru vulnerabilit\u0103\u021bi \u00een implement\u0103rile dispozitivelor wireless, care permit, prin metode triviale, substituirea propriilor cadre necriptate:  <\/p>\n<ul>\n<li class=\"l\"> Vulnerabilit\u0103\u021bile CVE-2020-26140 \u0219i CVE-2020-26143 permit substituirea cadrelor pe unele puncte de acces \u0219i pl\u0103ci de re\u021bea wireless \u00een Linux, Windows \u0219i FreeBSD.\n<li class=\"l\"> Vulnerabilitatea VE-2020-26145 permite manipularea fragmentelor de tip broadcast necriptate ca fiind cadre complete \u00een macOS, iOS, FreeBSD \u0219i NetBSD.\n<li class=\"l\"> Vulnerabilitatea CVE-2020-26144 permite manipularea cadrelor A-MSDU necriptate reconstruit\u0103 cu EtherType EAPOL pe Huawei Y6, Nexus 5X, FreeBSD \u0219i LANCOM AP.   <\/ul>\n<p>Alte vulnerabilit\u0103\u021bi \u00een implement\u0103ri sunt legate \u00een principal de problemele care apar la manipularea cadrelor fragmentate:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-26139: permite redirec\u021bionarea cadrelor cu flag EAPOL, trimise de un expeditor neautentificat (afecteaz\u0103 2\/4 puncte de acces verificate, precum \u0219i solu\u021bii bazate pe NetBSD \u0219i FreeBSD).\n<li class=\"l\"> CVE-2020-26146: permite reconstruc\u021bia fragmentelor criptate f\u0103r\u0103 verificarea ordinii numerelor de secven\u021b\u0103.\n<li class=\"l\"> CVE-2020-26147: permite reconstruc\u021bia fragmentelor mixte criptate \u0219i necriptate.\n<li class=\"l\"> CVE-2020-26142: permite manipularea cadrelor fragmentate ca \u0219i cum ar fi cadavre complete (afecteaz\u0103 OpenBSD \u0219i modulul wireless ESP12-F).\n<li class=\"l\"> CVE-2020-26141: verificarea TKIP MIC pentru cadre fragmentate este absent\u0103.    <\/ul>\n<p>Probleme \u00een specifica\u021bii:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-24588 &#8212; atac asupra cadrelor agregate (banda &#171;is aggregated&#187; nu este protejat\u0103 \u0219i poate fi \u00eenlocuit\u0103 de atacator \u00een cadrele A-MSDU \u00een WPA, WPA2, WPA3 \u0219i WEP). Ca exemplu de aplicare a atacului se men\u021bioneaz\u0103 redirec\u021bionarea utilizatorului c\u0103tre un server DNS mali\u021bios sau ocolirea NAT.  <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/bf3fed5fd117b86ac96dc8f23e8cd879.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-245870 &#8212; atac asupra amestec\u0103rii cheilor (permis\u0103 reconstituirea fragmentelor criptate utiliz\u00e2nd chei diferite \u00een WPA, WPA2, WPA3 \u0219i WEP). Atacul permite identificarea datelor trimise de client, de exemplu, determinarea con\u021binutului cookie-urilor \u00een cazul apelurilor HTTP.  <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/e7acd01c5864ae3371f16440c3e47c2c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-24586 &#8212; atac asupra cache-ului de fragmente (standarde care acoper\u0103 WPA, WPA2, WPA3 \u0219i WEP, nu cer eliminarea fragmentelor deja stocate \u00een cache dup\u0103 o nou\u0103 conectare la re\u021bea). Permite identificarea datelor trimise de client \u0219i substituirea acestora cu propriile date.    <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/ef87a0afaee47e83071d8d2a55815a2e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/ul>\n<p>Pentru testarea gradului de vulnerabilitate a dispozitivelor, a fost preg\u0103tit un set special de instrumente \u0219i o imagine Live gata pentru crearea unui USB bootabil. \u00cen Linux, problemele se manifest\u0103 \u00een re\u021beaua wireless mac80211, \u00een anumite drivere wireless \u0219i \u00een firmware-urile \u00eenc\u0103rcate pe pl\u0103cile wireless. Pentru eliminarea vulnerabilit\u0103\u021bilor, a fost propus un set de patch-uri care acoper\u0103 stiva mac80211 \u0219i driverele ath10k\/ath11k. Pentru unele dispozitive, cum ar fi pl\u0103cile wireles Intel, este necesar\u0103 instalarea unei actualiz\u0103ri de firmware suplimentare.    <\/p>\n<p>Teste ale dispozitivelor standard:  <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/d255c5ffdb38c2a61a8da50a889167cd.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Teste ale pl\u0103cilor wireless \u00een Linux \u0219i Windows:  <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/06dd228788a85d2275ea19fd698202e0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Teste ale pl\u0103cilor wireless \u00een FreeBSD \u0219i NetBSD:  <center><img decoding=\"async\" alt=\"FragAttacks - o serie de vulnerabilit\u0103\u021bi \u00een standardele \u0219i implement\u0103rile Wi-Fi.\" src=\"\/wp-content\/uploads\/2021\/05\/d3f3aa83a669cdc60710baff04493a92.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Produc\u0103torii au fost informa\u021bi despre probleme \u00eenc\u0103 acum 9 luni. Aceast\u0103 perioad\u0103 \u00eendelungat\u0103 de embargo se explic\u0103 prin preg\u0103tirea coordonat\u0103 a actualiz\u0103rilor \u0219i \u00eent\u00e2rzierile \u00een preg\u0103tirea modific\u0103rilor specifica\u021biilor de c\u0103tre organiza\u021biile ICASI \u0219i Wi-Fi Alliance. Ini\u021bial, era planificat s\u0103 se divulge informa\u021biile pe 9 martie, dar, evalu\u00e2nd riscurile, s-a decis s\u0103 se am\u00e2ne publicarea cu \u00eenc\u0103 dou\u0103 luni pentru a oferi mai mult timp pentru preg\u0103tirea patch-urilor, av\u00e2nd \u00een vedere complexitatea modific\u0103rilor propuse \u0219i dificult\u0103\u021bile cauzate de pandemia COVID-19.     <\/p>\n<p>Este remarcabil faptul c\u0103, \u00een ciuda embargoului, compania Microsoft a remediat anticipat unele vulnerabilit\u0103\u021bi \u00een actualizarea din martie a Windows. Dezv\u0103luirea informa\u021biilor a fost am\u00e2nat\u0103 cu o s\u0103pt\u0103m\u00e2n\u0103 fa\u021b\u0103 de termenul ini\u021bial stabilit, iar compania Microsoft nu a reu\u0219it sau nu a vrut s\u0103 fac\u0103 modific\u0103ri \u00een actualizarea planificat\u0103, ceea ce a creat o amenin\u021bare pentru utilizatorii altor sisteme, deoarece atacatorii puteau ob\u021bine informa\u021bii despre vulnerabilit\u0103\u021bi prin inginerie invers\u0103 a con\u021binutului actualiz\u0103rilor.<br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55133\">opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c FragAttacks \u0438 \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0442 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u0441\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0435\u0441\u044f \u0432 \u043e\u0431\u0438\u0445\u043e\u0434\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u043f\u043b\u0430\u0442\u044b \u0438 \u0442\u043e\u0447\u043a\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 &#8212; \u0438\u0437 \u043f\u0440\u043e\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 75 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u043a\u0430\u0436\u0434\u043e\u0435 \u0431\u044b\u043b\u043e \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043e \u043a\u0430\u043a \u043c\u0438\u043d\u0438\u043c\u0443\u043c \u043e\u0434\u043d\u043e\u043c\u0443 \u0438\u0437 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u0442\u0430\u043a\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u044b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100143,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, 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