{"id":113232,"date":"2024-01-29T18:50:31","date_gmt":"2024-01-29T16:50:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-01-29T18:50:31","modified_gmt":"2024-01-29T16:50:31","slug":"uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Vulnerabilitate \u00een stiva IPv6 a nucleului Linux care permite execu\u021bia de cod de la distan\u021b\u0103.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Informa\u021biile despre vulnerabilitatea CVE-2023-6200 din stiva de re\u021bea a nucleului Linux au fost dezv\u0103luite. Aceasta permite unui atacator din re\u021beaua local\u0103 s\u0103 execute codul s\u0103u prin trimiterea unui pachet ICMPv6 special formatat, con\u021bin\u00e2nd un mesaj RA (Router Advertisement), destinat anun\u021b\u0103rii informa\u021biilor despre router. <\/p>\n

Vulnerabilitatea poate fi exploatat\u0103 doar din re\u021beaua local\u0103 \u0219i se manifest\u0103 \u00een sistemele cu suport IPv6 activat \u0219i parametrul sysctl \"net.ipv6.conf..accept_ra\" activ (poate fi verificat cu comanda \"sysctl net.ipv6.conf | grep accept_ra\"), care este dezactivat \u00een mod implicit \u00een RHEL \u0219i Ubuntu pentru interfe\u021bele de re\u021bea externe, dar activat pentru interfa\u021ba loopback, permi\u021b\u00e2nd astfel un atac din acela\u0219i sistem. <\/p>\n

Vulnerabilitatea este cauzat\u0103 de o stare de concuren\u021b\u0103 \u00een timp ce colectorul de gunoi proceseaz\u0103 \u00eenregistr\u0103rile dep\u0103\u0219ite fib6_info, ceea ce poate duce la accesarea unei zone de memorie deja eliberate (use-after-free). La primirea unui pachet ICMPv6 cu un mesaj de anun\u021b de router (RA, Router Advertisement), stiva de re\u021bea apeleaz\u0103 func\u021bia ndisc_router_discovery(), care, \u00een prezen\u021ba unor date \u00een mesajul RA referitoare la timpul de via\u021b\u0103 al rutei, apeleaz\u0103 func\u021bia fib6_set_expires() \u0219i umple structura gc_link. Pentru cur\u0103\u021barea \u00eenregistr\u0103rilor dep\u0103\u0219ite se folose\u0219te func\u021bia fib6_clean_expires(), care desprinde \u00eenregistrarea din gc_link \u0219i elibereaz\u0103 memoria utilizat\u0103 de structura fib6_info. Exist\u0103 un moment anume \u00een care memoria pentru structura fib6_info este deja eliberat\u0103, dar referin\u021ba la aceasta continu\u0103 s\u0103 existe \u00een structura gc_link. <\/p>\n

Vulnerabilitatea se manifest\u0103 \u00eencep\u00e2nd cu versiunea 6.6 \u0219i a fost remediat\u0103 \u00een versiunile 6.6.9 \u0219i 6.7. Starea remedierii vulnerabilit\u0103\u021bii \u00een distribu\u021bii poate fi evaluat\u0103 pe paginile respective: Debian, Ubuntu, SUSE, RHEL, Fedora, Arch Linux, Gentoo, Slackware. Printre distribu\u021biile care ofer\u0103 pachete cu nucleul 6.6 se num\u0103r\u0103 Arch Linux, Gentoo, Fedora, Slackware, OpenMandriva \u0219i Manjaro, \u00een timp ce \u00een celelalte distribu\u021bii nu este exclus posibilitatea backport\u0103rii modific\u0103rii eronate \u00een pachetele cu versiuni mai vechi ale nucleului (de exemplu, \u00een Debian se men\u021bioneaz\u0103 c\u0103 pachetul cu nucleul 6.5.13 este vulnerabil, \u00een timp ce modificarea problematic\u0103 a ap\u0103rut \u00een ramura 6.6). Ca o solu\u021bie alternativ\u0103 de protec\u021bie, se poate dezactiva IPv6 sau se poate atribui o valoare de 0 parametrilor \"net.ipv6.conf.*.accept_ra\".
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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ProHoster","description":"A fost dezv\u0103luit\u0103 informa\u021bia despre vulnerabilitatea CVE-2023-6200 din stiva de re\u021bea a nucleului Linux, care, \u00een anumite circumstan\u021be, permite unui atacator din re\u021beaua local\u0103 s\u0103 execute codul s\u0103u prin trimitere.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","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 IPv6-\u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2023-6200) \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043e\u0431\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430\u0445 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0438\u0437 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