{"id":100086,"date":"2021-05-04T22:22:55","date_gmt":"2021-05-04T20:22:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-exim-4-94-2-s-ustraneniem-10-udalyonno-ekspluatiruemyh-uyazvimostej"},"modified":"2021-05-04T22:22:55","modified_gmt":"2021-05-04T20:22:55","slug":"obnovlenie-exim-4-94-2-s-ustraneniem-10-udalyonno-ekspluatiruemyh-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-exim-4-94-2-s-ustraneniem-10-udalyonno-ekspluatiruemyh-uyazvimostej","title":{"rendered":"Aktualizace Exim 4.94.2 s odstran\u011bn\u00edm 10 vzd\u00e1len\u011b zneu\u017eiteln\u00fdch zranitelnost\u00ed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byl zve\u0159ejn\u011bn nov\u00fd vyd\u00e1n\u00ed po\u0161tovn\u00edho serveru Exim 4.94.2, kter\u00e9 opravuje 21 zranitelnost\u00ed (CVE-2020-28007-CVE-2020-28026, CVE-2021-27216), je\u017e byly identifikov\u00e1ny spole\u010dnost\u00ed Qualys a ozna\u010deny k\u00f3dov\u00fdm n\u00e1zvem 21Nails. 10 probl\u00e9m\u016f m\u016f\u017ee b\u00fdt zneu\u017eito na d\u00e1lku (v\u010detn\u011b proveden\u00ed k\u00f3du s pr\u00e1vy root) prost\u0159ednictv\u00edm manipulac\u00ed s p\u0159\u00edkazy SMTP p\u0159i interakci se serverem.     <\/p>\n<p>Zranitelnost\u00ed jsou posti\u017eeny v\u0161echny verze Exim, jejich\u017e historie je sledov\u00e1na v Gitu od roku 2004. Pro 4 lok\u00e1ln\u00ed zranitelnosti a 3 vzd\u00e1len\u00e9 probl\u00e9my byly p\u0159ipraveny funk\u010dn\u00ed prototypy exploit\u016f. Exploity pro lok\u00e1ln\u00ed zranitelnosti (CVE-2020-28007, CVE-2020-28008, CVE-2020-28015, CVE-2020-28012) umo\u017e\u0148uj\u00ed zv\u00fd\u0161it sv\u00e9 opr\u00e1vn\u011bn\u00ed na u\u017eivatele root. Dv\u011b vzd\u00e1len\u00e9 probl\u00e9my (CVE-2020-28020, CVE-2020-28018) umo\u017e\u0148uj\u00ed bez autentizace prov\u00e9st k\u00f3d s pr\u00e1vy u\u017eivatele exim (pot\u00e9 je mo\u017en\u00e9 z\u00edskat p\u0159\u00edstup k root, zneu\u017eit\u00edm jedn\u00e9 z lok\u00e1ln\u00edch zranitelnost\u00ed).     <\/p>\n<p>Zranitelnost CVE-2020-28021 umo\u017e\u0148uje okam\u017eit\u00e9 vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du s pr\u00e1vy roota, av\u0161ak vy\u017eaduje autentizovan\u00fd p\u0159\u00edstup (u\u017eivatel mus\u00ed vytvo\u0159it autentizovanou relaci, po kter\u00e9 m\u016f\u017ee zranitelnost vyu\u017e\u00edt manipulac\u00ed s parametrem AUTH v p\u0159\u00edkazu MAIL FROM). Probl\u00e9m je zp\u016fsoben t\u00edm, \u017ee \u00fato\u010dn\u00edk m\u016f\u017ee dos\u00e1hnout vlo\u017een\u00ed \u0159et\u011bzce do hlavi\u010dky spool souboru kv\u016fli z\u00e1pisu hodnoty authenticated_sender bez \u0159\u00e1dn\u00e9ho escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f (nap\u0159\u00edklad p\u0159ed\u00e1n\u00edm p\u0159\u00edkazu \"MAIL FROM: AUTH=Raven+0AReyes\").        <\/p>\n<p>D\u00e1le je uvedeno, \u017ee dal\u0161\u00ed vzd\u00e1len\u00e1 zranitelnost CVE-2020-28017 m\u016f\u017ee b\u00fdt vyu\u017eita k vykon\u00e1n\u00ed k\u00f3du s pr\u00e1vy u\u017eivatele \"exim\" bez autentizace, av\u0161ak vy\u017eaduje v\u00edce ne\u017e 25 GB pam\u011bti. U zb\u00fdvaj\u00edc\u00edch 13 zranitelnost\u00ed mohou b\u00fdt potenci\u00e1ln\u011b tak\u00e9 p\u0159ipraveny exploity, ale pr\u00e1ce v tomto sm\u011bru dosud nebyla provedena.        <\/p>\n<p>V\u00fdvoj\u00e1\u0159i Exim byli o probl\u00e9mech informov\u00e1ni ji\u017e v \u0159\u00edjnu lo\u0148sk\u00e9ho roku a str\u00e1vili v\u00edce ne\u017e 6 m\u011bs\u00edc\u016f v\u00fdvojem oprav. V\u0161em spr\u00e1vc\u016fm se doporu\u010duje nev\u00e1hat a urgentn\u011b aktualizovat Exim na sv\u00fdch po\u0161tovn\u00edch serverech. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-gdansk\/\"   title=\"serverech\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4516\">serverech<\/a> do verze 4.94.2. V\u0161echny verze Exim p\u0159ed vyd\u00e1n\u00edm 4.94.2 byly ozna\u010deny jako zastaral\u00e9 (obsolete). Publikace nov\u00e9 verze byla koordinov\u00e1na s distribucemi, kter\u00e9 z\u00e1rove\u0148 zve\u0159ejnily aktualizace bal\u00ed\u010dk\u016f: Ubuntu, Arch Linux, FreeBSD, Debian, SUSE a Fedora. RHEL a CentOS nejsou touto probl\u00e9mem ovlivn\u011bny, proto\u017ee Exim nen\u00ed sou\u010d\u00e1st\u00ed jejich standardn\u00edho repozit\u00e1\u0159e bal\u00ed\u010dk\u016f (aktualizace zat\u00edm chyb\u00ed v EPEL).   <\/p>\n<p>Vzd\u00e1len\u00e9 zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-28017: P\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla ve funkci receive_add_recipient();\n<li class=\"l\"> CVE-2020-28020: P\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla ve funkci receive_msg();\n<li class=\"l\"> CVE-2020-28023: \u010cten\u00ed z oblasti mimo alokovan\u00fd buffer ve funkci smtp_setup_msg();\n<li class=\"l\"> CVE-2020-28021: Vlo\u017een\u00ed nov\u00e9ho \u0159\u00e1dku do hlavi\u010dky spoolingov\u00e9ho souboru;\n<li class=\"l\"> CVE-2020-28022: Z\u00e1pis a \u010dten\u00ed z oblasti mimo alokovan\u00fd buffer ve funkci extract_option();\n<li class=\"l\"> CVE-2020-28026: O\u0159\u00edznut\u00ed a vlo\u017een\u00ed \u0159et\u011bzce ve funkci spool_read_header();\n<li class=\"l\"> CVE-2020-28019: Chyba p\u0159i resetov\u00e1n\u00ed ukazatele na funkci po zji\u0161t\u011bn\u00ed chyby BDAT;\n<li class=\"l\"> CVE-2020-28024: P\u0159ete\u010den\u00ed p\u0159es doln\u00ed hranici bufferu ve funkci smtp_ungetc();\n<li class=\"l\"> CVE-2020-28018: P\u0159\u00edstup k bufferu po jeho uvoln\u011bn\u00ed (use-after-free) v tls-openssl.c\n<li class=\"l\"> CVE-2020-28025: \u010cten\u00ed z oblasti mimo alokovan\u00fd buffer ve funkci pdkim_finish_bodyhash().  <\/ul>\n<p>Lok\u00e1ln\u00ed zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-28007: \u00datok prost\u0159ednictv\u00edm symbolick\u00e9ho odkazu v adres\u00e1\u0159i s logem Exim;\n<li class=\"l\"> CVE-2020-28008: \u00datoky na adres\u00e1\u0159 se spoolingem;\n<li class=\"l\"> CVE-2020-28014: Vytvo\u0159en\u00ed libovoln\u00e9ho souboru;\n<li class=\"l\"> CVE-2021-27216: Odstran\u011bn\u00ed libovoln\u00e9ho souboru;\n<li class=\"l\"> CVE-2020-28011: P\u0159ete\u010den\u00ed bufferu ve funkci queue_run();\n<li class=\"l\"> CVE-2020-28010: Z\u00e1pis za hranici bufferu ve funkci main();\n<li class=\"l\"> CVE-2020-28013: P\u0159ete\u010den\u00ed bufferu ve funkci parse_fix_phrase();\n<li class=\"l\"> CVE-2020-28016: Z\u00e1pis za hranici bufferu ve funkci parse_fix_phrase();\n<li class=\"l\"> CVE-2020-28015: Vlo\u017een\u00ed nov\u00e9ho \u0159\u00e1dku do hlavi\u010dky spoolingov\u00e9ho souboru;\n<li class=\"l\"> CVE-2020-28012: Chyb\u011bj\u00edc\u00ed flag close-on-exec pro privilegovan\u00fd anonymn\u00ed kan\u00e1l;\n<li class=\"l\"> CVE-2020-28009: P\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla ve funkci get_stdinput().  <\/ul>\n<p>          <center>  <iframe loading=\"lazy\" title=\"V\u00edceerozhran\u00ed Exim Mail Server (21Nails)\" src=\"https:\/\/player.vimeo.com\/video\/544783362\" width=\"640\" height=\"360\"><\/iframe>  <\/center><br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55079\">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 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim 4.94.2 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 21 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2020-28007-CVE-2020-28026, CVE-2021-27216), \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Qualys \u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c 21Nails. 10 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e (\u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root), \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 SMTP-\u043a\u043e\u043c\u0430\u043d\u0434\u0430\u043c\u0438 \u043f\u0440\u0438 \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0438 \u0441 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u0432\u0441\u0435 \u0432\u0435\u0440\u0441\u0438\u0438 Exim, \u0438\u0441\u0442\u043e\u0440\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 Git [&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-100086","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 Exim 4.94.2 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 21 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2020-28007-CVE-2020-28026, CVE-2021-27216), \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Qualys \u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c 21Nails.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-exim-4-94-2-s-ustraneniem-10-udalyonno-ekspluatiruemyh-uyazvimostej\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 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\/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-05-04T20:22:55+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-05-04T20:22:55+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Aktualizace Exim 4.94.2 s opravou 10 zranitelnost\u00ed, kter\u00e9 lze vzd\u00e1len\u011b vyu\u017e\u00edt | ProHoster","description":"Bylo vyd\u00e1no vyd\u00e1n\u00ed po\u0161tovn\u00edho serveru Exim 4.94.2 s opravou 21 zranitelnost\u00ed (CVE-2020-28007-CVE-2020-28026, CVE-2021-27216), kter\u00e9 byly identifikov\u00e1ny spole\u010dnost\u00ed Qualys a prezentov\u00e1ny pod k\u00f3dov\u00fdm jm\u00e9nem 21Nails.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-exim-4-94-2-s-ustraneniem-10-udalyonno-ekspluatiruemyh-uyazvimostej","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 Exim 4.94.2 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c 10 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0445 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