{"id":172753,"date":"2026-05-19T18:24:36","date_gmt":"2026-05-19T16:24:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-19T18:24:36","modified_gmt":"2026-05-19T16:24:36","slug":"pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"PinTheft \u2014 la sesta vulnerabilit\u00e0 della classe Copy Fail, che fornisce diritti di root in Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata rivelata un'informazione sulla sesta vulnerabilit\u00e0 (1, 2-3, 4, 5), che consente a un utente locale non privilegiato di ottenere i diritti di root sovrascrivendo i dati nella cache di pagina. La vulnerabilit\u00e0 \u00e8 stata soprannominata PinTheft. \u00c8 disponibile un prototipo dell'exploit. L'identificatore CVE non \u00e8 ancora stato assegnato. La correzione \u00e8 attualmente disponibile solo sotto forma di patch, pubblicata il 5 maggio e accettata nel ramo netdev l'11 maggio, ma non inclusa nelle versioni correttive del kernel.     <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 presente nell'implementazione del protocollo di rete RDS (Reliable Datagram Sockets), progettato per lo scambio ad alta velocit\u00e0 di messaggi tra nodi in un cluster, con ritardi minimi e consegna garantita. Un attacco \u00e8 possibile su sistemi con il sottosistema io_uring attivato (io_uring_disabled=0) e un kernel compilato con le opzioni CONFIG_RDS, CONFIG_RDS_TCP e CONFIG_IO_URING. Per il funzionamento dell'exploit, deve essere disponibile un file eseguibile leggibile con il flag SUID-root nel sistema.      <\/p>\n<p>Per il caricamento automatico del modulo del kernel rds_tcp, l'exploit richiede l'invio di dati attraverso RDS utilizzando il trasporto SO_RDS_TRANSPORT=2. Si osserva che, tra le distribuzioni Linux testate, il modulo del kernel rds \u00e8 fornito solo su Arch Linux nella configurazione predefinita. Per bloccare la vulnerabilit\u00e0, \u00e8 possibile disattivare l'autocaricamento dei moduli del kernel rds e rds_tcp: rmmod rds_tcp rds printf &#8216;install rds \/bin\/false&#092;ninstall rds_tcp \/bin\/false&#092;n&#8217; &gt; \/etc\/modprobe.d\/pintheft.conf      <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 causata da un errore nell'implementazione del meccanismo zerocopy nella funzione rds_message_zcopy_from_user(), che modifica direttamente i dati nella cache di pagina per evitare il buffering non necessario. In caso di errore, non veniva eseguita la pulizia del campo rm-&gt;data.op_nents, il che portava a un doppio rilascio del buffer (double-free). La comparsa di un valore errato nel contatore dei riferimenti \u00e8 stata sfruttata per sovrascrivere i dati nella cache di pagina, grazie alla manipolazione del puntatore al buffer fisso io_uring.    <\/p>\n<p>Per il resto, il meccanismo di sfruttamento \u00e8 tipico per tutte le vulnerabilit\u00e0 di questa classe \u2014 l'attaccante riesce a inserire il file del programma con il flag suid root nella cache di pagina, dopodich\u00e9 inserisce nel header ELF il codice per avviare \/usr\/bin\/sh. Dopo questa manipolazione, l'esecuzione del programma porta al caricamento in memoria non del file eseguibile originale dal supporto, ma di una copia modificata dalla cache di pagina. A differenza dei precedenti exploit, la nuova variante \u00e8 adattata esclusivamente per attaccare l'utilit\u00e0 \u00absu\u00bb, ma pu\u00f2 essere utilizzata anche in presenza di programmi suid nel sistema, come mount, passwd, chsh, newgrp, umount e pkexec.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65476\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f PinTheft. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 5 \u043c\u0430\u044f \u0438 11 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442\u0432 \u0432\u0435\u0442\u043a\u0443 netdev, \u043d\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0451\u043d \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-172753","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 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