{"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\/hr\/blog\/news\/perepolnenie-bufera-v-openssl-ekspluatiruemoe-pri-proverke-sertifikatov-x-509","title":{"rendered":"Preliv podatka u OpenSSL-u, iskori\u0161ten u provjeri X.509 certifikata","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Objavljena je ispravka za kriptografsku biblioteku OpenSSL 3.0.7, koja rje\u0161ava dvije ranjivosti. Obje probleme uzrokuje preliv podatka u kodu koji provjerava polje s email adresom u X.509 certifikatima i potencijalno mogu dovesti do izvr\u0161avanja koda prilikom obrade posebno oblikovanog certifikata. U vrijeme objave ispravka, programeri OpenSSL-a nisu zabilje\u017eili ni\u0161ta \u0161to bi ukazivalo na aktivne eksploite koji bi mogli dovesti do izvr\u0161avanja koda napada\u010da.      <\/p>\n<p>Iako je u prethodno objavljenom najavi novog izdanja spomenuto postojanje kriti\u010dne ranjivosti, stvarni status ranjivosti u izdanju bio je smanjen na razinu opasne, ali ne kriti\u010dne ranjivosti. U skladu s pravilima projekta, smanjenje razine opasnosti doga\u0111a se kada se problem manifestira u neobi\u010dnim konfiguracijama ili kada je niska vjerojatnost eksploatacije ranjivosti u praksi.    <\/p>\n<p>U ovom slu\u010daju, razina opasnosti je smanjena jer su tijekom detaljne analize ranjivosti vi\u0161e organizacija zaklju\u010dile da se mogu\u0107nost izvr\u0161avanja koda tijekom eksploatacije blokira mehanizmima za\u0161tite od prelivanja stoga. Osim toga, kori\u0161tena raspodjela mre\u017ee u nekim Linux distribucijama dovodi do toga da izlazak iz okvira od 4 bajta utje\u010de na sljede\u0107i jo\u0161 neiskori\u0161teni bafer u stogu. Ipak, nisu isklju\u010dene platforme na kojima je mogu\u0107a eksploatacija za izvr\u0161avanje koda.            <\/p>\n<p>Otkrivene pote\u0161ko\u0107e:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2022-3602 \u2014 ranjivost koja je prvotno predstavljena kao kriti\u010dna, dovodi do 4-bajtovnog prelivanja bafera prilikom provere u X.509 sertifikatu u polju sa specijalno oblikovanom email adresom. U TLS klijentu, ranjivost se mo\u017ee iskoristiti prilikom povezivanja na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-shicago\/\"   title=\"poslu\u017eitelju\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2925\">poslu\u017eitelju<\/a>, pod kontrolom napada\u010da. Na TLS poslu\u017eitelju, ranjivost mo\u017ee biti iskori\u0161tena u slu\u010daju kori\u0161tenja autentifikacije klijenata putem certifikata. Pri tome se ranjivost manifestira nakon verifikacije lanaca povjerenja povezanih s certifikatom, tj. za napad je potreban da je certifikat napada\u010da ovjeren od strane certifikacijskog tijela.\n<li class=\"l\"> CVE-2022-3786 \u2014 drugi vektor iskori\u0161\u0107enja ranjivosti CVE-2022-3602, otkriven tokom analize problema. Razlike se svode na mogu\u0107nost prelivanja bafera u steku za proizvoljan broj bajtova koji sadr\u017ee simbol \u00ab.\u00bb (tj. napada\u010d ne mo\u017ee upravljati sadr\u017eajem prelivanja i problem se mo\u017ee iskoristiti samo za izazivanje ru\u0161enja aplikacije).    <\/ul>\n<p>Ranjivosti se javljaju samo u grani OpenSSL 3.0.x (gre\u0161ka je nastala u kodu za konverziju Unicode (punycode), dodanom u granu 3.0.x). Izdanja OpenSSL 1.1.1, kao i odvojene biblioteke LibreSSL i BoringSSL, nisu pogo\u0111ene problemom. Istodobno je objavljena a\u017euriranja OpenSSL 1.1.1s, koja sadr\u017ee samo ispravke gre\u0161aka koje nisu povezane sa sigurno\u0161\u0107u.    <\/p>\n<p>Grana OpenSSL 3.0 koristi se u takvim distribucijama kao \u0161to su Ubuntu 22.04, CentOS Stream 9, RHEL 9, OpenMandriva 4.2, Gentoo, Fedora 36, Debian Testing\/Unstable. Korisnicima ovih sustava preporu\u010duje se \u0161to je prije mogu\u0107e instalirati a\u017euriranja (Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch). U SUSE Linux Enterprise 15 SP4 i openSUSE Leap 15.4, paketi s OpenSSL 3.0 dostupni su opcionalno, dok sustavni paketi koriste granu 1.1.1. U granama OpenSSL 1.x ostaju Debian 11, Arch Linux, Void Linux, Ubuntu 20.04, Slackware, ALT Linux, RHEL 8, OpenWrt, Alpine Linux 3.16 i FreeBSD.<br \/>\n<br \/>Izvor: <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 5.0.4 - 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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