{"id":105445,"date":"2022-11-02T03:36:49","date_gmt":"2022-11-02T01:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/perepolnenie-bufera-v-openssl-ekspluatiruemoe-pri-proverke-sertifikatov-x-509"},"modified":"2022-11-02T03:36:49","modified_gmt":"2022-11-02T01:36:49","slug":"perepolnenie-bufera-v-openssl-ekspluatiruemoe-pri-proverke-sertifikatov-x-509","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/perepolnenie-bufera-v-openssl-ekspluatiruemoe-pri-proverke-sertifikatov-x-509","title":{"rendered":"Przepe\u0142nienie bufora w OpenSSL, wykorzystywane podczas weryfikacji certyfikat\u00f3w X.509","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Opublikowano poprawkow\u0105 wersj\u0119 biblioteki kryptograficznej OpenSSL 3.0.7, w kt\u00f3rej usuni\u0119to dwie podatno\u015bci. Obie problemy s\u0105 spowodowane przepe\u0142nieniem bufora w kodzie sprawdzania pola z adresem e-mail w certyfikatach X.509 i mog\u0105 potencjalnie prowadzi\u0107 do wykonania kodu podczas przetwarzania specjalnie przygotowanego certyfikatu. W momencie publikacji poprawki nie by\u0142o informacji od deweloper\u00f3w OpenSSL o dzia\u0142aj\u0105cym exploicie mog\u0105cym prowadzi\u0107 do wykonania kodu atakuj\u0105cego.      <\/p>\n<p>Chocia\u017c w wcze\u015bniej opublikowanym zapowiedzi nowego wydania wspomniano o krytycznym problemie, w rzeczywisto\u015bci w wydanej aktualizacji status podatno\u015bci zosta\u0142 obni\u017cony do poziomu niebezpiecznej, ale nie krytycznej podatno\u015bci. Zgodnie z zasadami przyj\u0119tymi w projekcie, obni\u017cenie poziomu niebezpiecze\u0144stwa nast\u0119puje w przypadku wyst\u0105pienia problemu w nietypowych konfiguracjach lub w przypadku niskiego prawdopodobie\u0144stwa wykorzystania podatno\u015bci w praktyce.    <\/p>\n<p>W rozpatrywanym przypadku poziom niebezpiecze\u0144stwa zosta\u0142 obni\u017cony, poniewa\u017c w wyniku szczeg\u00f3\u0142owej analizy podatno\u015bci przez kilka organizacji stwierdzono, \u017ce mo\u017cliwo\u015b\u0107 wykonania kodu podczas eksploatacji jest blokowana przez stosowane w wielu platformach mechanizmy ochrony przed przepe\u0142nieniem stosu. Ponadto, stosowany w niekt\u00f3rych dystrybucjach Linux uk\u0142ad sieciowy prowadzi do tego, \u017ce wyj\u015bcia poza 4 bajty nak\u0142adaj\u0105 si\u0119 na nast\u0119puj\u0105cy w stosie bufor, kt\u00f3ry jeszcze nie jest u\u017cywany. Niemniej jednak, istnieje mo\u017cliwo\u015b\u0107, \u017ce istniej\u0105 platformy, na kt\u00f3rych mo\u017cliwa jest eksploatacja do wykonania kodu.            <\/p>\n<p>Zidentyfikowane problemy:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2022-3602 \u2014 podatno\u015b\u0107, pierwotnie przedstawiana jako krytyczna, prowadzi do 4-bajtowego przepe\u0142nienia bufora podczas weryfikacji w certyfikacie X.509 pola ze specjalnie sformatowanym adresem email. W kliencie TLS podatno\u015b\u0107 mo\u017ce by\u0107 wykorzystana podczas \u0142\u0105czenia z <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/server\/dts-shicago\/\"   title=\"serwera\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2925\">serwera<\/a>, kontrolowanym przez atakuj\u0105cego. Na serwerze TLS podatno\u015b\u0107 mo\u017ce by\u0107 eksploatowana w przypadku zastosowania uwierzytelniania klient\u00f3w za pomoc\u0105 certyfikat\u00f3w. Przy tym podatno\u015b\u0107 ujawnia si\u0119 na etapie po weryfikacji powi\u0105zanej z certyfikatem \u0142a\u0144cucha zaufania, co oznacza, \u017ce do ataku wymagane jest, aby centrum certyfikacji zatwierdzi\u0142o z\u0142o\u015bliwy certyfikat napastnika.\n<li class=\"l\"> CVE-2022-3786 \u2014 inny wektor eksploitacji podatno\u015bci CVE-2022-3602, ujawniony podczas analizy problemu. R\u00f3\u017cnice ograniczaj\u0105 si\u0119 do mo\u017cliwo\u015bci przepe\u0142nienia bufora na stosie o dowolnej liczbie bajt\u00f3w, zawieraj\u0105cych znak \u201e.\u201d (tzn. atakuj\u0105cy nie mo\u017ce kontrolowa\u0107 zawarto\u015bci przepe\u0142nienia, a problem mo\u017ce by\u0107 wykorzystany jedynie do wymuszenia awaryjnego zako\u0144czenia aplikacji).    <\/ul>\n<p>Podatno\u015bci wyst\u0119puj\u0105 tylko w ga\u0142\u0119zi OpenSSL 3.0.x (b\u0142\u0105d pojawi\u0142 si\u0119 w kodzie konwersji Unicode (punycode), dodanym do ga\u0142\u0119zi 3.0.x). Wydania OpenSSL 1.1.1, a tak\u017ce odbieg\u0142e od OpenSSL biblioteki LibreSSL i BoringSSL, nie s\u0105 nara\u017cone na ten problem. Jednocze\u015bnie wydano aktualizacj\u0119 OpenSSL 1.1.1s, kt\u00f3ra zawiera tylko poprawki b\u0142\u0119d\u00f3w niezwi\u0105zane z bezpiecze\u0144stwem.    <\/p>\n<p>Ga\u0142\u0105\u017a OpenSSL 3.0 jest u\u017cywana w takich dystrybucjach jak Ubuntu 22.04, CentOS Stream 9, RHEL 9, OpenMandriva 4.2, Gentoo, Fedora 36, Debian Testing\/Unstable. U\u017cytkownicy tych system\u00f3w s\u0105 zach\u0119cani do jak najszybszego zainstalowania aktualizacji (Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch). W SUSE Linux Enterprise 15 SP4 i openSUSE Leap 15.4 pakiety z OpenSSL 3.0 s\u0105 dost\u0119pne opcjonalnie, pakiety systemowe korzystaj\u0105 z ga\u0142\u0119zi 1.1.1. W ga\u0142\u0119ziach OpenSSL 1.x pozostaj\u0105 Debian 11, Arch Linux, Void Linux, Ubuntu 20.04, Slackware, ALT Linux, RHEL 8, OpenWrt, Alpine Linux 3.16 i FreeBSD.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=58025\">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 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 OpenSSL 3.0.7, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438. \u041e\u0431\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u043e\u043b\u044f \u0441 email-\u0430\u0434\u0440\u0435\u0441\u043e\u043c \u0432 \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u0430\u0445 X.509 \u0438 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u0430. \u041d\u0430 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u043c\u0438 OpenSSL \u043d\u0435 \u0431\u044b\u043b\u043e \u0437\u0430\u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043e \u0444\u0430\u043a\u0442\u043e\u0432 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0440\u0430\u0431\u043e\u0447\u0435\u0433\u043e \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0433\u043e \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\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-105445","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 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 OpenSSL 3.0.7, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0434\u0432\u0435 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