{"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\/et\/blog\/news\/perepolnenie-bufera-v-openssl-ekspluatiruemoe-pri-proverke-sertifikatov-x-509","title":{"rendered":"Buffer overflow OpenSSL-is, mida kasutatakse X.509 sertifikaatide kontrollimisel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Avaldati OpenSSL 3.0.7 kr\u00fcptograafia raamatukogu parandusv\u00e4ljaanne, milles k\u00f5rvaldatakse kaks haavatavust. M\u00f5lemad probleemid on p\u00f5hjustatud m\u00e4lupuhvri \u00fclevoolust e-kirja aadressi kontrollimise koodis X.509 sertifikaatides ja v\u00f5ivad potentsiaalselt p\u00f5hjustada koodi t\u00e4itmist spetsiaalselt kujundatud sertifikaadi t\u00f6\u00f6tlemisel. OpenSSL arendajate kinnitusel ei olnud paranduse avaldamise ajal tuvastatud t\u00f6\u00f6tavat eksploiti, mis suudaks r\u00fcnnakute koodi t\u00e4ita.      <\/p>\n<p>Kuigi eelnevalt avaldatud uue v\u00e4ljaande teatistes mainiti kriitilise probleemi olemasolu, oli tegelikult v\u00e4lja antud v\u00e4rskenduses haavatavuse staatus alandatud ohtlikuks, kuid mitte kriitiliseks haavatavuseks. Projekti reeglite kohaselt tehakse ohtlikkuse taseme alandamine juhul, kui probleem ilmneb ebat\u00fc\u00fcpilistes konfiguratsioonides v\u00f5i kui haavatavuse praktiline \u00e4rakasutamise t\u00f5en\u00e4osus on madal.    <\/p>\n<p>Antud juhul alandati ohtlikkuse taset, kuna mitmed organisatsioonid tegid haavatavuse p\u00f5hjalikul anal\u00fc\u00fcsil j\u00e4relduse, et koodi t\u00e4itmise v\u00f5imalus haavatavuse \u00e4rakasutamisel on blokeeritud paljudes platvormides rakendatud m\u00e4lupuhvri \u00fclevoolu kaitsemehhanismide kaudu. Lisaks toob m\u00f5nedes Linuxi distributsioonides kasutatav v\u00f5rgu jaotumine kaasa selle, et v\u00e4ljaulatuvad 4 baiti kattuvad j\u00e4rgnevate jaotamata m\u00e4lupuhvritega, mis ei ole veel kasutusel. Siiski ei saa v\u00e4listada, et on olemas ka selliseid platvorme, kus koodi t\u00e4itmise \u00e4rakasutamine on v\u00f5imalik.            <\/p>\n<p>Tuvastatud probleemid:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2022-3602 \u2014 haavatavus, mis algselt esitati kui kriitiline, toob kaasa 4-baidise m\u00e4lu \u00fclevoolu, kui kontrollitakse X.509 sertifikaadi v\u00e4lja, mis sisaldab spetsiaalselt vormindatud e-posti aadressi. TLS-i kliendis v\u00f5ib seda haavatavust \u00e4ra kasutada, kui \u00fchendatakse <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-shicago\/\"   title=\"serveri\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2925\">serveri<\/a>, r\u00fcndaja kontrolli all olevale serverile. TLS-serveris v\u00f5ib haavatavust \u00e4rakasutada, kui kasutatakse kliendi sertifikaatide autentimist. Samal ajal avaldub haavatavus p\u00e4rast sertifikaadiga seotud usaldusketi kontrollimist, st r\u00fcnnaku teostamiseks on vajalik, et sertifitseerimisasutus kehtestaks r\u00fcndaja pahatahtliku sertifikaadi.\n<li class=\"l\"> CVE-2022-3786 \u2014 teine r\u00fcnnakusuund CVE-2022-3602 haavatavusele, mis tuvastati probleemi anal\u00fc\u00fcsi k\u00e4igus. Erinevusi on see, et m\u00e4lus v\u00f5ib tekkida \u00fclevool juhuslikus arvus baite, mis sisaldavad m\u00e4rki \u00ab.\u00bb (st r\u00fcndajal ei ole v\u00f5imalik \u00fclevoolu sisu juhtida ja probleem v\u00f5ib olla kasutatav ainult rakenduse ootamatuks sulgemiseks).    <\/ul>\n<p>Haavatavused ilmnevad ainult OpenSSL 3.0.x haru puhul (viga tekkis Unicode (punycode) muundamise koodis, mis lisati harule 3.0.x). OpenSSL 1.1.1 v\u00e4ljalasked, samuti OpenSSL-i harud LibreSSL ja BoringSSL ei ole probleemile allaheidetavad. Samuti on v\u00e4lja antud v\u00e4rskendus OpenSSL 1.1.1s, mis sisaldab ainult mitte-seoositavaid veaparandusi.    <\/p>\n<p>OpenSSL 3.0 haru kasutatakse sellistes jaotustes nagu Ubuntu 22.04, CentOS Stream 9, RHEL 9, OpenMandriva 4.2, Gentoo, Fedora 36, Debian Testing\/Unstable. Nende s\u00fcsteemide kasutajatele soovitatakse v\u00f5imalikult kiiresti v\u00e4rskendused installida (Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch). SUSE Linux Enterprise 15 SP4 ja openSUSE Leap 15.4 paketid, mis sisaldavad OpenSSL 3.0, on saadaval valikuliselt; s\u00fcsteemipaketid kasutavad haru 1.1.1. OpenSSL 1.x harudele j\u00e4\u00e4vad Debian 11, Arch Linux, Void Linux, Ubuntu 20.04, Slackware, ALT Linux, RHEL 8, OpenWrt, Alpine Linux 3.16 ja FreeBSD.<br \/>\n<br \/>Allikas: <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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