{"id":107307,"date":"2023-03-16T12:48:10","date_gmt":"2023-03-16T10:48:10","guid":{"rendered":"https:\/\/prohoster.info\/?p=107307"},"modified":"2023-03-17T13:35:25","modified_gmt":"2023-03-17T11:35:25","slug":"obnovlenie-openssh-9-3-s-ustraneniem-problem-s-bezopasnostyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/obnovlenie-openssh-9-3-s-ustraneniem-problem-s-bezopasnostyu","title":{"rendered":"Aktualizacja OpenSSH 9.3 z poprawkami problem\u00f3w zabezpiecze\u0144","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Wydano wydanie OpenSSH 9.3, otwartej implementacji klienta i serwera do pracy z protoko\u0142ami SSH 2.0 i SFTP. W nowej wersji usuni\u0119to problemy z bezpiecze\u0144stwem:    <\/p>\n<ul>\n<li class=\"l\"> W narz\u0119dziu ssh-add wykryto b\u0142\u0105d logiczny, kt\u00f3ry powodowa\u0142, \u017ce przy dodawaniu kluczy dla kart inteligentnych do ssh-agenta nie by\u0142y przekazywane ograniczenia ustalane za pomoc\u0105 opcji &#171;ssh-add -h&#187;. W rezultacie do agenta dodawano klucz, dla kt\u00f3rego nie stosowano ogranicze\u0144 pozwalaj\u0105cych na po\u0142\u0105czenia tylko z okre\u015blonych host\u00f3w.\n<li class=\"l\"> W narz\u0119dziu ssh wykryto podatno\u015b\u0107, kt\u00f3ra mo\u017ce prowadzi\u0107 do odczytu danych z przestrzeni stosu poza przydzielonym buforem podczas przetwarzania specjalnie sformatowanych odpowiedzi DNS, w przypadku w\u0142\u0105czenia opcji VerifyHostKeyDNS w pliku konfiguracyjnym. Problem wyst\u0119puje w wbudowanej implementacji funkcji getrrsetbyname(), kt\u00f3ra jest u\u017cywana w przeno\u015bnych wersjach OpenSSH budowanych bez u\u017cycia zewn\u0119trznej biblioteki ldns (&#8212;with-ldns) i na systemach z domy\u015blnymi bibliotekami, kt\u00f3re nie obs\u0142uguj\u0105 wywo\u0142ania getrrsetbyname(). Mo\u017cliwo\u015b\u0107 wykorzystania podatno\u015bci, poza inicjowaniem odmowy us\u0142ugi dla klienta ssh, oceniana jest jako ma\u0142o prawdopodobna.  <\/ul>\n<p>Dodatkowo mo\u017cna zauwa\u017cy\u0107 podatno\u015b\u0107 w bibliotekach libskey, kt\u00f3re wchodz\u0105 w sk\u0142ad OpenBSD, a kt\u00f3re s\u0105 u\u017cywane w OpenSSH. Problem ten wyst\u0119puje od 1997 roku i mo\u017ce prowadzi\u0107 do przepe\u0142nienia bufora w stosie podczas przetwarzania specjalnie sformatowanych nazw host\u00f3w. Odnotowano, \u017ce mimo i\u017c manifestacja podatno\u015bci mo\u017ce by\u0107 inicjowana zdalnie przez OpenSSH, w praktyce jest ona bezu\u017cyteczna, poniewa\u017c aby si\u0119 ujawni\u0142a, nazwa atakowanego hosta (&#047;etc&#047;hostname) musi zawiera\u0107 wi\u0119cej ni\u017c 126 znak\u00f3w, a bufor mo\u017ce by\u0107 przepe\u0142niony tylko znakami o zerowym kodzie (&#8216;&#092;0&#8217;).        <\/p>\n<p>W\u015br\u00f3d zmian niezwi\u0105zanych z bezpiecze\u0144stwem:  <\/p>\n<ul>\n<li class=\"l\"> W ssh-keygen i ssh-keyscan dodano wsparcie dla parametru &#171;-Ohashalg=sha1|sha256&#187;, kt\u00f3ry pozwala na wyb\u00f3r algorytmu wy\u015bwietlania odcisk\u00f3w SSHFP.\n<li class=\"l\"> W sshd dodano opcj\u0119 &#171;-G&#187; do analizy i wy\u015bwietlania aktywnej konfiguracji bez pr\u00f3by \u0142adowania kluczy prywatnych i bez wykonywania dodatkowych kontroli, co pozwala na weryfikacj\u0119 konfiguracji na etapie przed generowaniem kluczy i umo\u017cliwia przeprowadzanie kontroli przez u\u017cytkownik\u00f3w nieposiadaj\u0105cych uprawnie\u0144.\n<li class=\"l\"> W sshd wzmocniono izolacj\u0119 na platformie Linux, wykorzystuj\u0105c mechanizmy filtrowania wywo\u0142a\u0144 systemowych seccomp i seccomp-bpf. Do listy dozwolonych wywo\u0142a\u0144 systemowych dodano flagi do mmap, madvise i futex.    <\/ul>\n<p>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58801\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.3, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e: \u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ssh-add \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043e\u0448\u0438\u0431\u043a\u0430, \u0438\u0437-\u0437\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u0432 ssh-agent \u043a\u043b\u044e\u0447\u0435\u0439 \u0434\u043b\u044f \u0441\u043c\u0430\u0440\u0442\u043a\u0430\u0440\u0442 \u0430\u0433\u0435\u043d\u0442\u0443 \u043d\u0435 \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u043b\u0438\u0441\u044c \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f, \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043e\u043f\u0446\u0438\u0438 &#171;ssh-add -h&#187;. \u0412 \u0438\u0442\u043e\u0433\u0435 \u0432 \u0430\u0433\u0435\u043d\u0442 \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u043b\u0441\u044f \u043a\u043b\u044e\u0447, [&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-107307","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=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.3, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f 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