W FreeBSD zidentyfikowano luk\u0119 (CVE-2022-23093) w narz\u0119dziu ping, kt\u00f3re jest cz\u0119\u015bci\u0105 podstawowej instalacji. Problem mo\u017ce potencjalnie prowadzi\u0107 do zdalnego wykonania kodu z uprawnieniami root podczas sprawdzania za pomoc\u0105 polecenia ping zewn\u0119trznego hosta kontrolowanego przez atakuj\u0105cego. Poprawka zosta\u0142a zaproponowana w aktualizacjach FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 i 12.3-RELEASE-p10. Na razie nie jest jasne, czy inne systemy BSD s\u0105 podatne na wykryt\u0105 luk\u0119 (nie pojawi\u0142y si\u0119 raporty o lukach w NetBSD, DragonFlyBSD i OpenBSD). <\/p>\n
Luka jest spowodowana przepe\u0142nieniem bufora w kodzie analizy komunikat\u00f3w ICMP, kt\u00f3re przychodz\u0105 w odpowiedzi na zapytanie kontrolne. Kod wysy\u0142ania i odbierania komunikat\u00f3w ICMP w programie ping u\u017cywa surowych gniazd i jest wykonywany z podwy\u017cszonymi uprawnieniami (narz\u0119dzie dostarczane jest z flag\u0105 setuid root). Odpowiedzi obs\u0142ugiwane s\u0105 po stronie ping poprzez rekonstrukcj\u0119 nag\u0142\u00f3wk\u00f3w IP i ICMP pakiet\u00f3w, kt\u00f3re s\u0105 otrzymywane z surowego gniazda. Wydzielone nag\u0142\u00f3wki IP i ICMP s\u0105 kopiowane przez funkcj\u0119 pr_pack() do bufor\u00f3w, nie uwzgl\u0119dniaj\u0105c, \u017ce w pakiecie po nag\u0142\u00f3wku IP mog\u0105 znajdowa\u0107 si\u0119 dodatkowe rozszerzone nag\u0142\u00f3wki. <\/p>\n
Podobne nag\u0142\u00f3wki s\u0105 wydzielane z pakietu i w\u0142\u0105czane do bloku nag\u0142\u00f3wk\u00f3w, ale nie s\u0105 uwzgl\u0119dniane przy obliczaniu rozmiaru bufora. W przypadku, gdy host w odpowiedzi na wys\u0142ane zapytanie ICMP zwr\u00f3ci pakiet z dodatkowymi nag\u0142\u00f3wkami, ich zawarto\u015b\u0107 b\u0119dzie zapisywana w obszarze poza granicami bufora w stosie. W rezultacie atakuj\u0105cy mo\u017ce nadpisa\u0107 do 40 bajt\u00f3w danych w stosie, co potencjalnie pozwala na wykonanie w\u0142asnego kodu. Niebezpiecze\u0144stwo problemu \u0142agodzi to, \u017ce w momencie wyst\u0105pienia b\u0142\u0119du proces znajduje si\u0119 w stanie izolacji wywo\u0142a\u0144 systemowych (tryb capability), co utrudnia uzyskanie dost\u0119pu do pozosta\u0142ej cz\u0119\u015bci systemu po wykorzystaniu luki. \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\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\udd47Zdalnie eksploatowana luka root w narz\u0119dziu ping dostarczanym w FreeBSD | ProHoster","description":"W FreeBSD wykryto luk\u0119 (CVE-2022-23093) w narz\u0119dziu ping, kt\u00f3re jest cz\u0119\u015bci\u0105 podstawowej wersji.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","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 \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443.","og:url":"https:\/\/prohoster.info\/pl\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-12-01T13:37:11+00:00","article:modified_time":"2022-12-01T13:37:11+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/105776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/comments?post=105776"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/105776\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/media?parent=105776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/categories?post=105776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/tags?post=105776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"