{"id":35396,"date":"2019-10-31T22:04:04","date_gmt":"2019-10-31T19:04:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimosti-v-tcp-stekah-linux-i-freebsd-privodyashhie-k-udalyonnomu-otkazu-v-obsluzhivanii\/"},"modified":"2019-10-31T22:04:04","modified_gmt":"2019-10-31T19:04:04","slug":"uyazvimosti-v-tcp-stekah-linux-i-freebsd-privodyashhie-k-udalyonnomu-otkazu-v-obsluzhivanii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-tcp-stekah-linux-i-freebsd-privodyashhie-k-udalyonnomu-otkazu-v-obsluzhivanii","title":{"rendered":"Vulnerabilit\u00e0 negli stack TCP di Linux e FreeBSD che portano a un'interruzione remota del servizio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Azienda Netflix ha messo in luce<\/a><\/noindex> diverse vulnerabilit\u00e0 critiche vulnerabilit\u00e0<\/a><\/noindex> nei pile TCP di Linux e FreeBSD, che consentono di avviare un crash del kernel o di causare un consumo eccessivo di risorse durante l'elaborazione di pacchetti TCP specificamente formattati (packet-of-death). I problemi sono causati<\/a><\/noindex> da errori nei gestori della dimensione massima del blocco dati nel pacchetto TCP (MSS, Massima dimensione del segmento) e nel meccanismo di riconoscimento selettivo delle connessioni (SACK, Riconoscimento selettivo TCP).<\/p>\n

  • CVE-2019-11477<\/a><\/noindex> (SACK Panic) — \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u044f\u0434\u0440\u0430\u0445 Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 2.6.29 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043a\u0440\u0430\u0445 (panic) \u044f\u0434\u0440\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u0435\u0440\u0438\u0438 SACK-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u0437-\u0437\u0430 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435. \u0414\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0434\u043b\u044f TCP-\u0441\u043e\u0435\u0434\u0438\u0435\u043d\u0438\u044f \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 MSS \u0432 48 \u0431\u0430\u0439\u0442 (\u043d\u0438\u0436\u043d\u0438\u0439 \u043b\u0438\u043c\u0438\u0442, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442 \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u0435\u0433\u043c\u0435\u043d\u0442\u0430 \u0432 8 \u0431\u0430\u0439\u0442) \u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0441\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0445 SACK-\u043f\u0430\u043a\u0435\u0442\u043e\u0432.\n

    Come soluzioni alternative di protezione, \u00e8 possibile disabilitare l'elaborazione SACK (scrivendo 0 in \/proc\/sys\/net\/ipv4\/tcp_sack) oppure bloccare<\/a><\/noindex> le connessioni con un MSS basso (funziona solo impostando sysctl net.ipv4.tcp_mtu_probing a 0 e potrebbe interrompere il funzionamento di alcune connessioni normali con un MSS basso);<\/p>\n

  • CVE-2019-11478<\/a><\/noindex> (SACK Slowness) — \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u044e \u0440\u0430\u0431\u043e\u0442\u044b \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 SACK (\u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 Linux \u043c\u043b\u0430\u0434\u0448\u0435 4.15) \u0438\u043b\u0438 \u0438\u0437\u0431\u044b\u0442\u043e\u0447\u043d\u043e\u043c\u0443 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u044e \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 SACK-\u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043e\u0447\u0435\u0440\u0435\u0434\u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 (TCP retransmission). \u041e\u0431\u0445\u043e\u0434\u043d\u044b\u0435 \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438;\n
  • CVE-2019-5599<\/a><\/noindex> (SACK Slowness) — \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u044e \u043a\u0430\u0440\u0442\u044b \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 SACK \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043e\u0434\u043d\u043e\u0433\u043e TCP-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0451\u043c\u043a\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u043f\u0435\u0440\u0435\u0431\u043e\u0440\u0430 \u0441\u043f\u0438\u0441\u043a\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u043e FreeBSD 12 \u0441 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u043e\u043c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u043e\u0442\u0435\u0440\u0438 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 RACK. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0439 \u043c\u0435\u0440\u044b \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u043c\u043e\u0434\u0443\u043b\u044c RACK;\n
  • CVE-2019-11479<\/a><\/noindex> — \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0432 \u044f\u0434\u0440\u0435 Linux \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u043e\u0442\u0432\u0435\u0442\u043e\u0432 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e TCP-\u0441\u0435\u0433\u043c\u0435\u043d\u0442\u043e\u0432, \u043a\u0430\u0436\u0434\u044b\u0439 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e 8 \u0431\u0430\u0439\u0442 \u0434\u0430\u043d\u043d\u044b\u0445, \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044e \u0442\u0440\u0430\u0444\u0438\u043a\u0430, \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u044e \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043d\u0430 CPU \u0438 \u0437\u0430\u0431\u0438\u0432\u0430\u043d\u0438\u044e \u043a\u0430\u043d\u0430\u043b\u0430 \u0441\u0432\u044f\u0437\u0438. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u043e\u0432\u0430\u043d\u043e bloccare<\/a><\/noindex> connessioni con MSS basso.\n<\/ul>\n

    Nel kernel di Linux, sono stati risolti problemi nelle versioni 4.4.182, 4.9.182, 4.14.127, 4.19.52 e 5.1.11. La correzione per FreeBSD \u00e8 disponibile come patch<\/a><\/noindex>. Negli aggiornamenti dei pacchetti con kernel gi\u00e0 rilasciati per i distribuzioni Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>. La correzione \u00e8 in fase di preparazione in Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex> e Arch Linux<\/a><\/noindex>.<\/p>\n

    <\/a><\/noindex><\/p>\n

    Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

    \u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Netflix \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 TCP-\u0441\u0442\u0435\u043a\u0430\u0445 Linux \u0438 FreeBSD, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u0440\u0430\u0445 \u044f\u0434\u0440\u0430 \u0438\u043b\u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0447\u0440\u0435\u0437\u043c\u0435\u0440\u043d\u043e\u0435 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 TCP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 (packet-of-death). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u0445 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0431\u043b\u043e\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 TCP-\u043f\u0430\u043a\u0435\u0442\u0435 (MSS, Maximum segment size) \u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0432\u044b\u0431\u043e\u0440\u043e\u0447\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 (SACK, TCP Selective Acknowledgement). CVE-2019-11477 (SACK Panic) […]<\/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-35396","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u00e0 negli stack TCP di Linux e FreeBSD che portano a un'interruzione del servizio remoto | ProHoster","description":"Netflix ha scoperto diverse vulnerabilit\u00e0 critiche negli stack TCP di Linux e FreeBSD, che consentono di avviare a distanza un crash del kernel o di causare un eccessivo consumo di risorse durante l'elaborazione di pacchetti TCP appositamente formattati (packet-of-death). I problemi sono causati da errori nei gestori della dimensione massima del blocco dati nel pacchetto TCP (MSS, Maximum Segment Size) e nel meccanismo di conferma selettiva delle connessioni (SACK, TCP Selective Acknowledgement). CVE-2019-11477 (SACK Panic)","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-v-tcp-stekah-linux-i-freebsd-privodyashhie-k-udalyonnomu-otkazu-v-obsluzhivanii","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\u0438 \u0432 TCP-\u0441\u0442\u0435\u043a\u0430\u0445 Linux \u0438 FreeBSD, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0438\u0435 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043e\u0442\u043a\u0430\u0437\u0443 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Netflix \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 TCP-\u0441\u0442\u0435\u043a\u0430\u0445 Linux \u0438 FreeBSD, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u0440\u0430\u0445 \u044f\u0434\u0440\u0430 \u0438\u043b\u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0447\u0440\u0435\u0437\u043c\u0435\u0440\u043d\u043e\u0435 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 TCP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 (packet-of-death). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u0445 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0431\u043b\u043e\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 TCP-\u043f\u0430\u043a\u0435\u0442\u0435 (MSS, Maximum segment size) \u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0432\u044b\u0431\u043e\u0440\u043e\u0447\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 (SACK, TCP Selective Acknowledgement). 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