Der er opdaget en s\u00e5rbarhed (CVE-2022-23093) i ping-v\u00e6rkt\u00f8jet, der er en del af standardpakken i FreeBSD. Problemet kan potentielt f\u00f8re til fjernudf\u00f8relse af kode med root-rettigheder, n\u00e5r man tjekker en ekstern v\u00e6rt, der kontrolleres af en angriber. Rettelser er foresl\u00e5et i opdateringerne FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 og 12.3-RELEASE-p10. Det er endnu uklart, om andre BSD-systemer er ramt af den opdagede s\u00e5rbarhed (der er ikke rapporteret nogen s\u00e5rbarheder i NetBSD, DragonFlyBSD og OpenBSD endnu). <\/p>\n
S\u00e5rbarheden skyldes en buffer-overl\u00f8b i koden, der h\u00e5ndterer ICMP-meddelelser, som kommer som svar p\u00e5 kontrolanmodningen. Koden til afsendelse og modtagelse af ICMP-meddelelser i ping bruger r\u00e5 sockets og k\u00f8rer med forh\u00f8jet privilegium (v\u00e6rkt\u00f8jet leveres med setuid root-flaget). Behandlingen af svaret sker i ping ved rekonstruktion af IP- og ICMP-hovedene fra pakkerne, der modtages fra den r\u00e5 socket. De allokerede IP- og ICMP-hoveder kopieres af funktionen pr_pack() til buffere, uden at tage hensyn til, at der kan v\u00e6re ekstra udvidede hoveder efter IP-hovedet i pakken. <\/p>\n
S\u00e5danne hoveder udtr\u00e6kkes fra pakken og inkluderes i headerblokken, men tages ikke i betragtning ved beregningen af bufferst\u00f8rrelsen. Hvis en v\u00e6rt returnerer en pakke med ekstra hoveder som svar p\u00e5 den sendte ICMP-anmodning, vil indholdet af disse hoveder blive skrevet til omr\u00e5det uden for bufferen p\u00e5 stakken. Som et resultat kan en angriber overskrive op til 40 byte data p\u00e5 stakken, hvilket potentielt muligg\u00f8r udf\u00f8relse af sin egen kode. Problemet er delvist afhjulpet af det faktum, at n\u00e5r fejlen opst\u00e5r, er processen i en isoleret tilstand af systemopkald (capability mode), hvilket g\u00f8r det vanskeligt at f\u00e5 adgang til resten af systemet efter udnyttelse af s\u00e5rbarheden. \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\udd47Fjernudnyttelig root-s\u00e5rbarhed i ping-v\u00e6rkt\u00f8jet leveret i FreeBSD | ProHoster","description":"Der er opdaget en s\u00e5rbarhed (CVE-2022-23093) i ping-v\u00e6rkt\u00f8jet, der er en del af standardpakken i 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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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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"