{"id":103950,"date":"2022-05-04T15:37:02","date_gmt":"2022-05-04T13:37:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns"},"modified":"2022-05-04T15:37:02","modified_gmt":"2022-05-04T13:37:03","slug":"uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","title":{"rendered":"Vulnerabilit\u00e0 in uClibc e uClibc-ng che consente la modifica dei dati nella cache DNS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nelle librerie standard C uClibc e uClibc-ng, usate in molti dispositivi embedded e portatili, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE non assegnato) che consente di inserire dati fasulli nella cache DNS, utilizzabile per alterare l'indirizzo IP di un dominio arbitrario e reindirizzare le richieste al dominio su un server controllato dall'attaccante.     <\/p>\n<p>Il problema colpisce vari firmware Linux per router, punti di accesso e dispositivi IoT, oltre a distribuzioni Linux per sistemi embedded, come OpenWRT e Embedded Gentoo. Si segnala che la vulnerabilit\u00e0 si manifesta in dispositivi di molti produttori (ad esempio, uClibc \u00e8 usato nei firmware Linksys, Netgear e Axis), ma poich\u00e9 la vulnerabilit\u00e0 in uClibc e uClibc-ng rimane non corretta, le informazioni dettagliate sui dispositivi e i produttori specifici che presentano il problema non sono ancora divulgate.    <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 causata dall'uso di identificatori di transazione prevedibili nel codice per l'invio di richieste DNS. Il numero identificativo della richiesta DNS veniva scelto incrementando semplicemente un contatore senza applicare ulteriore randomizzazione dei numeri di porta. Questo permetteva di ottenere un avvelenamento della cache DNS tramite l'invio anticipato di pacchetti UDP con risposte fasulle (la risposta viene accettata se arriva prima della risposta reale <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3809\">server<\/a> e include un ID corretto). A differenza del metodo di Kaminsky proposto nel 2008, l'identificatore di transazione non deve nemmeno essere indovinato, poich\u00e9 \u00e8 prevedibile sin dall'inizio (inizialmente viene impostato a 1, che viene incrementato ad ogni richiesta, invece di essere scelto casualmente).     <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 in uClibc e uClibc-ng che consente la modifica dei dati nella cache DNS\" src=\"\/wp-content\/uploads\/2022\/05\/29cd1ae29db2776f3121eda961bd8c4d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Nelle specifiche per la protezione contro il brute force dell'identificatore, si raccomanda di utilizzare una distribuzione casuale dei numeri delle porte di rete sorgente da cui vengono inviati i richieste DNS, per compensare la dimensione non sufficientemente grande dell'identificatore. Attivando la randomizzazione delle porte per generare una risposta fittizia, oltre a dover indovinare l'identificatore a 16 bit, \u00e8 necessario anche conoscere il numero della porta di rete. In uClibc e uClibc-ng, tale randomizzazione non era attivata esplicitamente (quando si chiamava bind, non era specificata una porta UDP sorgente casuale) e il suo utilizzo dipendeva dalle impostazioni del sistema operativo.     <\/p>\n<p>Quando la randomizzazione delle porte \u00e8 disattivata, l'identificazione dell'ID di richiesta incrementale viene considerata un compito banale. Tuttavia, anche quando la randomizzazione \u00e8 attiva, l'attaccante deve solo indovinare la porta di rete da un intervallo di 32768\u201360999, il che pu\u00f2 essere fatto inviando massicciamente risposte fittizie su diverse porte di rete.    <center><img decoding=\"async\" alt=\"Vulnerabilit\u00e0 in uClibc e uClibc-ng che consente la modifica dei dati nella cache DNS\" src=\"\/wp-content\/uploads\/2022\/05\/ba16f63c3eab657ee687a893744ae972.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>\u00c8 stata confermata la presenza di un problema in tutte le versioni attuali di uClibc e uClibc-ng, comprese le ultime versioni di uClibc 0.9.33.2 e uClibc-ng 1.0.40. A settembre 2021, le informazioni sulla vulnerabilit\u00e0 sono state inviate a CERT\/CC per la preparazione coordinata delle patch. A gennaio 2022, i dati sul problema sono stati forniti a oltre 200 produttori che collaborano con CERT\/CC. A marzo, \u00e8 stato tentato un contatto diretto con il manutentore del progetto uClibc-ng, ma ha risposto di non essere in grado di risolvere la vulnerabilit\u00e0 da solo e ha raccomandato di divulgare pubblicamente l'informazione sul problema, sperando di ricevere supporto dalla comunit\u00e0 per lo sviluppo di una patch. Tra i produttori, NETGEAR ha annunciato il rilascio di un aggiornamento per risolvere la vulnerabilit\u00e0.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57131\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 uClibc \u0438 uClibc-ng, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0438 \u043f\u043e\u0440\u0442\u0430\u0442\u0438\u0432\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u043a\u044d\u0448 DNS, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u0434\u043c\u0435\u043d\u044b \u0432 \u043a\u044d\u0448\u0435 IP-\u0430\u0434\u0440\u0435\u0441\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0434\u043e\u043c\u0435\u043d\u0430 \u0438 \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0439 \u043a \u0434\u043e\u043c\u0435\u043d\u0443 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 Linux-\u043f\u0440\u043e\u0448\u0438\u0432\u043a\u0438 \u0434\u043b\u044f \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432, \u0442\u043e\u0447\u0435\u043a \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430-\u0432\u0435\u0449\u0435\u0439, \u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103950","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=\"\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 uClibc \u0438 uClibc-ng, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0438 \u043f\u043e\u0440\u0442\u0430\u0442\u0438\u0432\u043d\u044b\u0445 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href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"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\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 uClibc \u0438 uClibc-ng, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c 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content=\"2022-05-04T13:37:03+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-05-04T13:37:03+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\udd47Vulnerabilit\u00e0 in uClibc e uClibc-ng che consente di alterare i dati nella cache DNS | ProHoster","description":"Nei standard delle librerie C uClibc e uClibc-ng, utilizzate in molti dispositivi embedded e portatili, \u00e8 stata rilevata una vulnerabilit\u00e0 (CVE non assegnato) che consente di inserire dati falsi nella cache DNS, utilizzabile per sostituire l'indirizzo IP di un dominio arbitrario nella cache e reindirizzare le richieste al dominio su un server controllato dall'attaccante. Il problema riguarda vari firmware Linux per router, punti di accesso e dispositivi IoT,","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 uClibc \u0438 uClibc-ng, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 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