{"id":119374,"date":"2024-08-12T09:43:01","date_gmt":"2024-08-12T07:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-08-12T09:43:01","modified_gmt":"2024-08-12T07:43:01","slug":"uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Sebess\u00e9g a sz\u00e1ll\u00edtott FreeBSD OpenSSH verzi\u00f3j\u00e1ban, amely t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t teszi lehet\u0151v\u00e9","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A FreeBSD-hez sz\u00e1ll\u00edtott OpenSSH szerverben felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2024-7589), amely lehet\u0151v\u00e9 teszi, hogy a k\u00f3d t\u00e1voli v\u00e9grehajt\u00e1s\u00e1t el\u00e9rj\u00fck root jogosults\u00e1gokkal an\u00e9lk\u00fcl, hogy hiteles\u00edt\u00e9st kellene v\u00e9gezni. A sebezhet\u0151s\u00e9g az OpenSSH-ban j\u00falius elej\u00e9n felfedezett probl\u00e9ma (CVE-2024-6387) v\u00e1ltozata, \u00e9s szint\u00e9n egy versenyfelt\u00e9tel eredm\u00e9nye, amely a jelkezel\u0151ben cselekv\u0151 funkci\u00f3k v\u00e9grehajt\u00e1s\u00e1b\u00f3l ad\u00f3dik, amelyeket nem sz\u00e1nnak aszinkron h\u00edv\u00e1sokra.       <\/p>\n<p>A FreeBSD fejleszt\u0151i azonnal jav\u00edtott\u00e1k a j\u00faliusi eredeti sebezhet\u0151s\u00e9get a bejelent\u00e9s ut\u00e1n, de a jav\u00edt\u00e1s nem fedte le az \u00f6sszes lehets\u00e9ges t\u00e1mad\u00e1si vektort. A jav\u00edt\u00e1s a sshlogv funkci\u00f3 h\u00edv\u00e1s\u00e1nak kikapcsol\u00e1s\u00e1ra korl\u00e1toz\u00f3dott, amely dinamikusan mem\u00f3ri\u00e1t foglal, ami aszinkron v\u00e9grehajt\u00e1s eset\u00e9n a malloc bels\u0151 strukt\u00far\u00e1inak s\u00e9r\u00fcl\u00e9s\u00e9hez vezethetett a SIGALRM jel kever\u0151je \u00e1ltal v\u00e9grehajtott k\u00f3d fut\u00e1sa k\u00f6zben. Kider\u00fclt, hogy hasonl\u00f3 probl\u00e9ma mer\u00fclt fel a FreeBSD specifikus blacklist_notify funkci\u00f3h\u00edv\u00e1s\u00e1ban, amely integr\u00e1ci\u00f3t biztos\u00edt a blacklistd h\u00e1tt\u00e9rfolyamat\u00e1val.       <\/p>\n<p>A jav\u00edt\u00e1s alkalmaz\u00e1sa mellett a sebezhet\u0151s\u00e9get a \/etc\/ssh\/sshd_config \"LoginGraceTime=0\" param\u00e9ter be\u00e1ll\u00edt\u00e1s\u00e1val is blokkolni lehet, de a timeout letilt\u00e1sa megk\u00f6nny\u00edti a szolg\u00e1ltat\u00e1smegtagad\u00e1s (DoS) kezdem\u00e9nyez\u00e9s\u00e9t, ha t\u00fal sok kapcsolatot l\u00e9tes\u00edtenek, meghaladva a MaxStartups param\u00e9ter \u00e1ltal megadott korl\u00e1tokat.     <\/p>\n<p>Ezen k\u00edv\u00fcl m\u00e9g h\u00e1rom sebezhet\u0151s\u00e9get is megsz\u00fcntettek a FreeBSD-ben:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-6760 \u2014 a ktrace v\u00e9delm\u00e9nek megker\u00fcl\u00e9s\u00e9nek lehet\u0151s\u00e9ge, amely lehet\u0151v\u00e9 teszi a nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra, hogy hozz\u00e1f\u00e9rjen olyan f\u00e1jlok tartalm\u00e1hoz, amelyek olvas\u00e1s\u00e1hoz nincs joga, p\u00e9ld\u00e1ul a felhaszn\u00e1l\u00f3k jelszavainak hash-ait tartalmaz\u00f3 f\u00e1jl tartalm\u00e1t is el lehet olvasni.\n<li class=\"l\"> CVE-2024-6759 \u2014 az NFS kliensben lehet\u0151s\u00e9g ny\u00edlt a f\u00e1jlnevekben az \"..\" \u00e9s \"\/\" elv\u00e1laszt\u00f3 karakterek haszn\u00e1lat\u00e1ra;\n<li class=\"l\"> CVE-2024-6640 \u2014 sebezhet\u0151s\u00e9g a PF csomagsz\u0171r\u0151ben, amely miatt a nulla azonos\u00edt\u00f3j\u00fa ICMPv6 csomagok nem estek a t\u0171zfal szab\u00e1lyai al\u00e1, amelyek arra sz\u00e1m\u00edtottak, hogy a bej\u00f6v\u0151 csomagokat a \u00e1llapot t\u00e1bl\u00e1zatban (state table) t\u00fckr\u00f6zik.    <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61690\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 FreeBSD \u0441\u0435\u0440\u0432\u0435\u0440\u0435 OpenSSH \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-7589), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u043c \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 \u043d\u0430\u0447\u0430\u043b\u0435 \u0438\u044e\u043b\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 OpenSSH (CVE-2024-6387) \u0438 \u0442\u0430\u043a\u0436\u0435 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438, \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0449\u0435\u043c \u0438\u0437-\u0437\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 \u0441\u0438\u0433\u043d\u0430\u043b\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \u043d\u0435 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0432\u044b\u0437\u043e\u0432 \u0432 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u043c \u0440\u0435\u0436\u0438\u043c\u0435. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u043b\u0438 \u0438\u0441\u0445\u043e\u0434\u043d\u0443\u044e [&hellip;]<\/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-119374","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 FreeBSD \u0441\u0435\u0440\u0432\u0435\u0440\u0435 OpenSSH 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\u00e1ltal biztos\u00edtott OpenSSH verzi\u00f3ban, amely t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t teszi lehet\u0151v\u00e9 | ProHoster","description":"A FreeBSD-hez sz\u00e1ll\u00edtott OpenSSH szerverben felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2024-7589), amely lehet\u0151v\u00e9 teszi, hogy a k\u00f3d t\u00e1voli v\u00e9grehajt\u00e1s\u00e1t el\u00e9rj\u00fck root jogosults\u00e1gokkal an\u00e9lk\u00fcl, hogy hiteles\u00edt\u00e9st kellene v\u00e9gezni.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 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