{"id":123647,"date":"2025-04-25T03:05:14","date_gmt":"2025-04-25T01:05:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov"},"modified":"2025-04-25T03:05:14","modified_gmt":"2025-04-25T01:05:14","slug":"prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","title":{"rendered":"Prototipo di rootkit per Linux che utilizza io_uring per eludere gli analizzatori delle chiamate di sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di ARMO hanno dimostrato la possibilit\u00e0 di creare rootkit che non utilizzano chiamate di sistema specifiche per eseguire operazioni comuni, come la lettura\/scrittura di file e la ricezione di comandi da un server esterno. Invece delle chiamate di sistema per operazioni di rete e file, \u00e8 stato proposto di utilizzare l'interfaccia di input\/output asincrono io_uring, supportato a partire dal kernel Linux 5.1.       <\/p>\n<p>L'essenza del metodo consiste nel fatto che, invece di singole chiamate di sistema per accedere a file e svolgere operazioni di rete (read\/write, recv\/send\/connect\/bind\/listen), si possono utilizzare chiamate di sistema generali di io_uring (io_uring_enter, io_uring_setup, io_uring_register, ecc.), che non vengono analizzate dagli strumenti comuni per individuare attivit\u00e0 dannose. L'interfaccia io_uring supporta circa 60 operazioni diverse. \u00c8 in fase di sviluppo una funzionalit\u00e0 che consente di avviare nuovi processi tramite io_uring.      <\/p>\n<p>Per dimostrare il funzionamento del metodo, \u00e8 stato preparato un prototipo di rootkit chiamato Curing, che esegue azioni come la ricezione di comandi da un host esterno <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=\"3963\">server<\/a> e trasferimento\/modifica di file. Nel dimostratore \u00e8 stata utilizzata l'invio di una richiesta alla porta TCP 8888 di un host esterno e l'invio del contenuto del file \u00ab\/etc\/shadow\u00bb. Si presume che, dopo la compromissione riuscita del sistema e l'ottenimento dei diritti di root, l'attaccante installi un rootkit per mantenere la sua presenza nel sistema compromesso.     <\/p>\n<p>Nell'esperimento condotto, l'attivit\u00e0 del rootkit Curing \u00e8 stata inosservata dagli strumenti di monitoraggio Falco e Tetragon, utilizzati per rilevare anomalie legate alla sicurezza sugli host e nei container (\u00e8 supportata l'integrazione con infrastrutture basate su Kubernetes). Questi strumenti utilizzano l'intercettazione delle chiamate di sistema per analizzare eventi come l'avvio di processi, l'attivit\u00e0 di rete e la gestione dei file, ma non considerano la possibilit\u00e0 di utilizzare la sottosistema io_uring per tali operazioni. Gran parte dei sistemi commerciali di rilevamento e risposta agli incidenti di sicurezza disponibili per Linux si basa anch'essa sull'intercettazione delle chiamate di sistema.    <\/p>\n<p>Per evitare di aggirare gli strumenti di monitoraggio delle attivit\u00e0 di rete e file, \u00e8 raccomandato utilizzare il meccanismo KRSI (Kernel Runtime Security Instrumentation), introdotto nel kernel Linux 5.7, che consente di collegare programmi BPF a qualsiasi hook LSM. Ad esempio, KRSI a livello di hook LSM consente di monitorare le operazioni sui file, l'accesso di rete e l'avvio di processi, indipendentemente dal fatto che tali operazioni siano state avviate tramite chiamate di sistema specifiche o tramite io_uring.    <\/p>\n<p>In precedenza, il sottosistema io_uring era stato oggetto di critiche a causa delle gravi vulnerabilit\u00e0 che emergono regolarmente. In risposta alle richieste degli utenti che desiderano uno strumento semplice per disabilitare io_uring senza ricompilare il kernel, \u00e8 stato aggiunto al kernel Linux 6.6 il sysctl io_uring_disabled. Google ha disabilitato io_uring per impostazione predefinita in ChromeOS, Android e nei suoi <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-gdansk\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4573\">server<\/a>, spiegando che la situazione preoccupante della sicurezza in io_uring supera i vantaggi di utilizzare io_uring per migliorare le prestazioni.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63136\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 ARMO \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0440\u0443\u0442\u043a\u0438\u0442\u043e\u0432, \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u0432\u044b\u0437\u043e\u0432\u044b \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a \u0447\u0442\u0435\u043d\u0438\u0435\/\u0437\u0430\u043f\u0438\u0441\u044c \u0444\u0430\u0439\u043b\u043e\u0432 \u0438 \u043f\u0440\u0438\u0451\u043c \u043a\u043e\u043c\u0430\u043d\u0434 \u043e\u0442 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0412\u043c\u0435\u0441\u0442\u043e \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0445 \u0432\u044b\u0437\u043e\u0432\u043e\u0432 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0438 \u0444\u0430\u0439\u043b\u043e\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 io_uring, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u044b\u0439 \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.1. \u0421\u0443\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u0430 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0432\u043c\u0435\u0441\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-123647","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 ARMO \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0440\u0443\u0442\u043a\u0438\u0442\u043e\u0432, \u043d\u0435 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comandi da un server esterno. 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