{"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\/pl\/blog\/news\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Luka w dostarczonej w FreeBSD wersji OpenSSH, kt\u00f3ra umo\u017cliwia zdalne wykonywanie kodu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W dostarczonym w sk\u0142adzie FreeBSD serwerze OpenSSH wykryto luk\u0119 (CVE-2024-7589), kt\u00f3ra umo\u017cliwia zdalne wykonywanie kodu z uprawnieniami roota bez przeprowadzenia uwierzytelniania. Luka jest wariantem problemu ujawnionego na pocz\u0105tku lipca w OpenSSH (CVE-2024-6387) i jest spowodowana stanem wy\u015bcigu, kt\u00f3ry powstaje z powodu wykonywania w obs\u0142udze sygna\u0142\u00f3w funkcji, nieprzystosowanych do wywo\u0142ania w trybie asynchronicznym.       <\/p>\n<p>Programi\u015bci FreeBSD usun\u0119li pierwotn\u0105 lipcow\u0105 luk\u0119 niezw\u0142ocznie po og\u0142oszeniu, jednak poprawka nie obejmowa\u0142a wszystkich mo\u017cliwych wektor\u00f3w ataku. Poprawka polega\u0142a na wy\u0142\u0105czeniu wywo\u0142ania funkcji sshlogv, kt\u00f3ra dynamicznie przydziela pami\u0119\u0107, co przy asynchronicznym wykonywaniu mog\u0142o prowadzi\u0107 do uszkodzenia wewn\u0119trznych struktur malloc w czasie wyzwolenia obs\u0142ugi sygna\u0142u SIGALRM podczas wykonywania okre\u015blonego kodu. Okaza\u0142o si\u0119, \u017ce podobny problem wyst\u0119powa\u0142 w specyficznym dla FreeBSD wywo\u0142aniu funkcji blacklist_notify, zapewniaj\u0105cym integracj\u0119 z procesem w tle blacklistd.       <\/p>\n<p>Opr\u00f3cz zastosowania \u0142atki, podatno\u015b\u0107 mo\u017cna zablokowa\u0107 przez ustawienie w \/etc\/ssh\/sshd_config parametru \u201eLoginGraceTime=0\u201d, jednak wy\u0142\u0105czenie limitu czasowego u\u0142atwi inicjowanie ataku typu denial of service przy ustanawianiu du\u017cej liczby po\u0142\u0105cze\u0144 przekraczaj\u0105cych limity okre\u015blone przez parametr MaxStartups.     <\/p>\n<p>Ponadto usuni\u0119to jeszcze trzy luki w FreeBSD:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-6760 \u2014 mo\u017cliwo\u015b\u0107 omini\u0119cia zabezpiecze\u0144 dla ktrace w celu \u015bledzenia proces\u00f3w suid, co pozwala nieuprzywilejowanemu u\u017cytkownikowi uzyska\u0107 dost\u0119p do tre\u015bci plik\u00f3w, do kt\u00f3rych nie ma praw dost\u0119pu; na przyk\u0142ad mo\u017cna odczyta\u0107 zawarto\u015b\u0107 pliku z haszami hase\u0142 u\u017cytkownik\u00f3w.\n<li class=\"l\"> CVE-2024-6759 \u2014 w kliencie NFS zidentyfikowano mo\u017cliwo\u015b\u0107 u\u017cywania w nazwach plik\u00f3w separator\u00f3w \u015bcie\u017cek \u201e..\u201d i \u201e\/\u201d;\n<li class=\"l\"> CVE-2024-6640 \u2014 podatno\u015b\u0107 w filtrze pakiet\u00f3w PF, z powodu kt\u00f3rej pakiety ICMPv6 z zerowym identyfikatorem nie podlega\u0142y regu\u0142om zapory sieciowej, kt\u00f3re zak\u0142ada\u0142y, \u017ce przychodz\u0105ce pakiety s\u0105 odzwierciedlane w tabeli stanu.    <\/ul>\n<p>\u0179r\u00f3d\u0142o: <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 5.0.1.1 - 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 \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 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