{"id":114452,"date":"2024-03-20T12:25:49","date_gmt":"2024-03-20T10:25:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami"},"modified":"2024-03-20T12:25:49","modified_gmt":"2024-03-20T10:25:49","slug":"ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","title":{"rendered":"Attacco a determinati protocolli basati su UDP, che porta a un loop di scambio dei pacchetti.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il Centro di Coordinamento CERT (Computer Emergency Response Team) ha pubblicato un avviso riguardante una serie di vulnerabilit\u00e0 nelle implementazioni di vari protocolli applicativi che utilizzano il protocollo UDP come trasporto. Le vulnerabilit\u00e0 possono essere sfruttate per effettuare attacchi di Denial of Service a causa della possibilit\u00e0 di un ciclo infinito nel trasferimento di pacchetti tra due host. Ad esempio, gli aggressori possono esaurire la larghezza di banda disponibile, bloccando il funzionamento dei servizi di rete (per esempio, generando un elevato carico e superando il limite di intensit\u00e0 delle richieste) e realizzando amplificatori di traffico per attacchi DDoS.     <\/p>\n<p>Tra i protocolli, alcune implementazioni vulnerabili includono DNS, NTP, TFTP, Echo (RFC862), Chargen (RFC864) e QOTD (RFC865). La vulnerabilit\u00e0 (CVE-2024-2169) \u00e8 stata confermata in alcuni prodotti delle aziende Cisco, Microsoft, Broadcom, Brother, Honeywell (CVE-2024-1309) e MikroTik. Come misure di mitigazione per bloccare le vulnerabilit\u00e0, si raccomanda di abilitare sul firewall il blocco dello spoofing (uRPF), limitare l'accesso ai servizi UDP non necessari e configurare un limite di intensit\u00e0 del traffico (rate-limit e QoS).      <\/p>\n<p>Le vulnerabilit\u00e0 sono causate dalla mancanza di protezione del protocollo UDP contro lo spoofing degli indirizzi \u2014 in assenza di protezione dallo spoofing sui router di transito, un attaccante pu\u00f2 specificare in un pacchetto UDP l'indirizzo IP di un server a scelta e inviare quel pacchetto a un altro server, che restituisce una risposta all'indirizzo fasullo indicato. Il metodo d'attacco consiste nel creare una situazione di looping scambiando pacchetti tra server che utilizzano implementazioni vulnerabili del protocollo. Ad esempio, in risposta a un pacchetto ricevuto, il server di destinazione pu\u00f2 inviare una risposta con un codice di errore, e il server il cui indirizzo \u00e8 stato indicato dall'attaccante restituir\u00e0 la propria risposta, che a sua volta porter\u00e0 nuovamente al ritorno di un pacchetto con un codice di errore. In questo modo, <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1893\">server<\/a> inizieranno a giocare a ping-pong con i pacchetti all'infinito.    <center><img decoding=\"async\" alt=\"Attacco a determinati protocolli basati su UDP, che porta a un loop di scambio dei pacchetti.\" src=\"\/wp-content\/uploads\/2024\/03\/26382437c9cda8b8361fad0167880772.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>\u00c8 interessante notare che questo metodo di attacco non \u00e8 nuovo e <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-dronten\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2577\">server<\/a> La sincronizzazione del tempo NTPD ha visto una delle sue vulnerabilit\u00e0 eliminate gi\u00e0 nel 2009 (CVE-2009-3563) nelle versioni 4.2.4p8 e 4.2.5. L'attacco consisteva nell'inviare un pacchetto NTP con un indirizzo falsificato e con il flag MODE_PRIVATE attivato, il quale, quando elaborato, faceva s\u00ec che il server di destinazione restituisse una risposta sull'impossibilit\u00e0 di utilizzare la modalit\u00e0 privata, mantenendo attivo il flag MODE_PRIVATE. Di conseguenza, un altro server non poteva gestire questo flag e restituiva la propria risposta, portando a un ciclo infinito di scambi di pacchetti tra i due server NTP. Per il protocollo DNS, un avviso riguardante la possibilit\u00e0 di questo tipo di attacco \u00e8 stato pubblicato gi\u00e0 nel 1996.       <\/p>\n<p>Una scansione globale degli indirizzi Internet ha mostrato che attualmente ci sono almeno 23.000 server TFTP vulnerabili, 63.000 server DNS, 89.000 server NTP, 56.000 servizi Echo\/RFC862, 22.000 servizi Chargen\/RFC864 e 21.000 servizi QOTD\/RFC865. Si presume che, nel caso dei server NTP, la presenza di vulnerabilit\u00e0 non corrette sia legata all'uso di versioni molto vecchie di ntpd, rilasciate prima del 2010. I servizi Echo, Chargen e QOTD sono vulnerabili per la loro architettura intrinseca. La situazione dei server TFTP e DNS richiede chiarimenti con i loro amministratori. I server atftpd e tftpd non sono affetti, poich\u00e9 utilizzano un numero casuale di porta di rete di origine per inviare una risposta. Tra i server DNS vulnerabili, viene menzionato dproxy-nexgen. Nei prodotti Microsoft, il problema si manifesta nei WDS (Windows Deployment Services), mentre nei prodotti Cisco \u00e8 presente nei router delle serie 2800 e 2970.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60814\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u0446\u0435\u043d\u0442\u0440 CERT (\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u0430\u044f \u0433\u0440\u0443\u043f\u043f\u0430 \u0440\u0435\u0430\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430 \u0447\u0440\u0435\u0437\u0432\u044b\u0447\u0430\u0439\u043d\u044b\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438), \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u043e \u0441\u0435\u0440\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b UDP. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0438\u0437-\u0437\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u0446\u0438\u043a\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u043e\u0431\u043c\u0435\u043d\u0430 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438 \u043c\u0435\u0436\u0434\u0443 \u0434\u0432\u0443\u043c\u044f \u0445\u043e\u0441\u0442\u0430\u043c\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0435 \u043c\u043e\u0433\u0443\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0441\u0435\u0442\u0438, \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":114453,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043e\u0440\u0434\u0438\u043d\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0439 \u0446\u0435\u043d\u0442\u0440 CERT (\u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u0430\u044f \u0433\u0440\u0443\u043f\u043f\u0430 \u0440\u0435\u0430\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430 \u0447\u0440\u0435\u0437\u0432\u044b\u0447\u0430\u0439\u043d\u044b\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438), \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u043e \u0441\u0435\u0440\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043f\u0440\u0438\u043a\u043b\u0430\u0434\u043d\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442\u0430 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b UDP. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 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\u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0441\u0435\u0442\u0438, \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-03-20T10:25:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-03-20T10:25:49+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Attacco a determinati protocolli basati su UDP che porta a un looping dello scambio di pacchetti | ProHoster","description":"Il Centro di Coordinamento CERT (gruppo informatico di risposta alle emergenze) ha pubblicato un avviso riguardante una serie di vulnerabilit\u00e0 nelle implementazioni di vari protocolli applicativi che utilizzano il protocollo UDP come trasporto. Le vulnerabilit\u00e0 possono essere sfruttate per attacchi di denial of service a causa della possibilit\u00e0 di un looping nel scambio di pacchetti tra due host. Ad esempio, gli attaccanti possono esaurire la larghezza di banda di rete disponibile, bloccando il funzionamento dei servizi di rete (ad esempio,","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataka-na-nekotorye-protokoly-na-osnove-udp-privodyashhaya-k-zacziklivaniyu-obmena-paketami","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0410\u0442\u0430\u043a\u0430 \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043d\u0430 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