Vo FreeBSD bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-23093) v utilite ping, ktor\u00e1 je s\u00fa\u010das\u0165ou z\u00e1kladnej dod\u00e1vky. Probl\u00e9m potenci\u00e1lne m\u00f4\u017ee vies\u0165 k vzdialen\u00e9mu vykonaniu k\u00f3du s pr\u00e1vami root pri overovan\u00ed pomocou ping vonkaj\u0161ieho hostite\u013ea, kontrolovan\u00e9ho \u00fato\u010dn\u00edkom. Oprava bola navrhnut\u00e1 v aktualiz\u00e1ci\u00e1ch FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 a 12.3-RELEASE-p10. \u010ci s\u00fa in\u00e9 BSD syst\u00e9my vystaven\u00e9 zisten\u00fdm zranite\u013enostiam zatia\u013e nie je jasn\u00e9 (spr\u00e1vy o zranite\u013enosti v NetBSD, DragonFlyBSD a OpenBSD zatia\u013e neboli vydan\u00e9). <\/p>\n
Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 prete\u010den\u00edm vyrovn\u00e1vacej pam\u00e4te v k\u00f3de spracovania spr\u00e1v ICMP, ktor\u00e9 prich\u00e1dzaj\u00fa ako odpove\u010f na kontroln\u00fd dopyt. K\u00f3d posielania a prij\u00edmania spr\u00e1v ICMP v ping pou\u017e\u00edva raw-sockety a vykon\u00e1va sa s zv\u00fd\u0161en\u00fdmi privil\u00e9giami (utilita sa dod\u00e1va s pr\u00edznakom setuid root). Spracovanie odpovede prebieha na strane ping cez rekon\u0161trukciu IP a ICMP hlavi\u010diek paketov, prijat\u00fdch z raw-socketu. Vydelen\u00e9 IP a ICMP hlavi\u010dky sa kop\u00edruj\u00fa funkciou pr_pack() do vyrovn\u00e1vacej pam\u00e4te, pri\u010dom sa nezoh\u013ead\u0148uje, \u017ee v pakete po hlavi\u010dke IP m\u00f4\u017eu by\u0165 pr\u00edtomn\u00e9 \u010fal\u0161ie roz\u0161\u00edren\u00e9 hlavi\u010dky. <\/p>\n
Podobn\u00e9 hlavi\u010dky s\u00fa vydelen\u00e9 z paketu a zahrnut\u00e9 do bloku hlavi\u010diek, ale nie s\u00fa zoh\u013eadnen\u00e9 pri v\u00fdpo\u010dte ve\u013ekosti vyrovn\u00e1vacej pam\u00e4te. Ak hostite\u013e v odpovedi na zaslan\u00fd ICMP dopyt vr\u00e1ti paket s dodato\u010dn\u00fdmi hlavi\u010dkami, ich obsah bude zap\u00edsan\u00fd do oblasti mimo vyrovn\u00e1vacej pam\u00e4te v z\u00e1sobn\u00edku. V d\u00f4sledku toho m\u00f4\u017ee \u00fato\u010dn\u00edk prepisova\u0165 a\u017e 40 bajtov \u00fadajov v z\u00e1sobn\u00edku, \u010do potenci\u00e1lne umo\u017e\u0148uje vykonanie jeho k\u00f3du. Nebezpe\u010denstvo probl\u00e9mu zmier\u0148uje skuto\u010dnos\u0165, \u017ee v \u010dase prejavu chyby je proces v stave izol\u00e1cie syst\u00e9mov\u00fdch volan\u00ed (capability mode), \u010do s\u0165a\u017euje z\u00edskanie pr\u00edstupu k zvy\u0161ku syst\u00e9mu po zneu\u017eit\u00ed zranite\u013enosti. \u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 ping \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0445\u043e\u0441\u0442\u0430, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 \u0438 12.3-RELEASE-p10. \u041f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u043b\u0438 \u0434\u0440\u0443\u0433\u0438\u0435 BSD-\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435 \u044f\u0441\u043d\u043e (\u043e\u0442\u0447\u0451\u0442\u043e\u0432 \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 NetBSD, […]<\/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-105776","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vzdialene zneu\u017eite\u013en\u00e1 root-zranite\u013enos\u0165 v utilite ping dod\u00e1vanej vo FreeBSD | ProHoster","description":"Vo FreeBSD bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2022-23093) v utilite ping, ktor\u00e1 je s\u00fa\u010das\u0165ou z\u00e1kladnej dod\u00e1vky.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f root-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0432\u043e FreeBSD | ProHoster","og:description":"\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"