{"id":82266,"date":"2020-05-20T19:42:07","date_gmt":"2020-05-20T17:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-uyazvimost-v-pochtovom-servere-qmail"},"modified":"2020-05-20T19:42:07","modified_gmt":"2020-05-20T17:42:07","slug":"udalyonno-ekspluatiruemaya-uyazvimost-v-pochtovom-servere-qmail","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/udalyonno-ekspluatiruemaya-uyazvimost-v-pochtovom-servere-qmail","title":{"rendered":"Vzdialene zneu\u017e\u00edvan\u00e1 zranite\u013enos\u0165 v po\u0161tovom serveri qmail","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edci z firmy Qualys <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2020\/05\/19\/8\">uk\u00e1zali<\/a><\/noindex> mo\u017enos\u0165 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.qualys.com\/2020\/05\/19\/cve-2005-1513\/remote-code-execution-qmail.txt\">vyu\u017eit\u00ed<\/a><\/noindex> zranitelnosti na mailov\u00e9m serveru qmail, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=5442\">zn\u00e1m\u00e9<\/a><\/noindex> ji\u017e od roku 2005 (CVE-2005-1513), ale z\u016fst\u00e1vala neopraven\u00e1, proto\u017ee autor qmail tvrdil, \u017ee je nerealistick\u00e9 vytvo\u0159it funguj\u00edc\u00ed exploit, kter\u00fd by mohl b\u00fdt pou\u017eit k \u00fatoku na syst\u00e9my v z\u00e1kladn\u00ed konfiguraci. V Qualys se poda\u0159ilo p\u0159ipravit exploit, kter\u00fd tuto p\u0159edstavu vyvrac\u00ed a umo\u017e\u0148uje iniciovat vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du na serveru prost\u0159ednictv\u00edm odesl\u00e1n\u00ed speci\u00e1ln\u011b upraven\u00e9 zpr\u00e1vy.<\/p>\n<p>Probl\u00e9m je zp\u016fsoben p\u0159ete\u010den\u00edm cel\u00e9ho \u010d\u00edsla ve funkci stralloc_readyplus(), kter\u00e9 m\u016f\u017ee nastat p\u0159i zpracov\u00e1n\u00ed velmi velk\u00e9 zpr\u00e1vy. K exploataci byla pot\u0159eba 64bitov\u00e1 soustava s objemem virtu\u00e1ln\u00ed pam\u011bti p\u0159es 4GB. P\u0159i prvn\u00edm rozboru zranitelnosti v roce 2005 Daniel Bernstein tvrdil, \u017ee p\u0159edpoklad v k\u00f3du, \u017ee velikost alokovan\u00e9ho pole se v\u017edy vejde do 32bitov\u00e9 hodnoty, je zalo\u017een na tom, \u017ee nikdo neposkytuje gigabyty pam\u011bti ka\u017ed\u00e9mu procesu. V posledn\u00edch 15 letech 64bitov\u00e9 soustavy na serverech vytla\u010dily 32bitov\u00e9, dramaticky vzrostly objemy dod\u00e1van\u00e9 pam\u011bti a propustnost s\u00edt\u00ed. <\/p>\n<p>Doprovodn\u00e9 bal\u00ed\u010dky s qmail zohlednily pozn\u00e1mku Bernsteina a p\u0159i spu\u0161t\u011bn\u00ed procesu qmail-smtpd omezily dostupnou pam\u011b\u0165 (nap\u0159\u00edklad v Debianu 10 je nastaven limit na 7MB). Ale in\u017een\u00fd\u0159i z Qualys zjistili, \u017ee to nesta\u010d\u00ed a krom\u011b qmail-smtpd m\u016f\u017ee b\u00fdt vzd\u00e1len\u00fd \u00fatok proveden na proces qmail-local, kter\u00fd ve v\u0161ech ov\u011b\u0159en\u00fdch bal\u00ed\u010dc\u00edch z\u016fst\u00e1val neomezen. Jako d\u016fkaz byl p\u0159ipraven prototyp exploit, vhodn\u00fd k \u00fatoku na dod\u00e1van\u00fd bal\u00ed\u010dek qmail v Debianu v z\u00e1kladn\u00ed konfiguraci.<br \/>\nK organizaci vzd\u00e1len\u00e9ho spu\u0161t\u011bn\u00ed k\u00f3du b\u011bhem \u00fatoku je pot\u0159eba m\u00edt na serveru 4GB voln\u00e9ho m\u00edsta na disku a 8GB RAM.<br \/>\nExploit umo\u017e\u0148uje spusti\u0165 ak\u00e9ko\u013evek shell pr\u00edkazy s pr\u00e1vami ak\u00e9hoko\u013evek pou\u017e\u00edvate\u013ea v syst\u00e9me, okrem root a syst\u00e9mov\u00fdch pou\u017e\u00edvate\u013eov, ktor\u00ed nemaj\u00fa svoj podprie\u010dinok v prie\u010dinku &#171;\\\/home&#187; (proces qmail-local sa sp\u00fa\u0161\u0165a s pr\u00e1vami lok\u00e1lneho pou\u017e\u00edvate\u013ea, ktor\u00e9mu sa dod\u00e1va).<\/p>\n<p>\u00datok je prov\u00e1d\u011bn<br \/>\ncez odoslanie ve\u013emi ve\u013ekej e-mailovej spr\u00e1vy, ktor\u00e1 obsahuje nieko\u013eko riadkov v hlavi\u010dke, ve\u013ekosti pribli\u017ene 4 GB a 576 MB. Spracovanie takejto hlavi\u010dky v qmail-local vedie k prete\u010deniu celej \u010d\u00edslice pri pokuse o doru\u010denie spr\u00e1vy lok\u00e1lnemu pou\u017e\u00edvate\u013eovi. Prete\u010denie celej \u010d\u00edslice n\u00e1sledne vedie k prete\u010deniu z\u00e1sobn\u00edka pri kop\u00edrovan\u00ed \u00fadajov a k mo\u017enosti prep\u00edsa\u0165 str\u00e1nky pam\u00e4te s k\u00f3dom libc. Cez manipul\u00e1cie s kompoz\u00edciou pren\u00e1\u0161an\u00fdch \u00fadajov je mo\u017en\u00e9 prep\u00edsa\u0165 aj adresu funkcie &#171;open()&#187;, nahradi\u0165 ju adresou funkcie &#171;system()&#187;. <\/p>\n<p>N\u00e1sledne, po\u010das volania qmesearch() v qmail-local sa otv\u00e1ra s\u00fabor &#171;.qmail-extension&#187; cez funkciu open(), \u010do vedie k skuto\u010dn\u00e9mu spusteniu funkcie<br \/>\nsystem(&#171;.qmail-extension&#187;). Ale preto\u017ee \u010das\u0165 s\u00faboru &#171;extension&#187; sa vytv\u00e1ra na z\u00e1klade adresy pr\u00edjemcu (napr\u00edklad &#171;localuser-extension@localdomain&#187;), \u00fato\u010dn\u00edci m\u00f4\u017eu zorganizova\u0165 prenos pr\u00edkazu na spustenie, uv\u00e1dzaj\u00fac pou\u017e\u00edvate\u013ea &#171;localuser-;command;@localdomain&#187; ako pr\u00edjemcu spr\u00e1vy. <\/p>\n<p>Po\u010das anal\u00fdzy k\u00f3du boli tie\u017e identifikovan\u00e9 dve zranite\u013enosti v dodato\u010dnom patchi qmail-verify, ktor\u00fd je s\u00fa\u010das\u0165ou bal\u00edka pre Debian. Prv\u00e1 zranite\u013enos\u0165 (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2020-3811\">CVE-2020-3811<\/a><\/noindex>) umo\u017e\u0148uje ob\u00eds\u0165 overenie e-mailovej adresy, zatia\u013e \u010do druh\u00e1 (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2020-3812\">CVE-2020-3812<\/a><\/noindex>) vedie k \u00faniku lok\u00e1lnych inform\u00e1ci\u00ed. Najm\u00e4 prv\u00e1 zranite\u013enos\u0165 umo\u017e\u0148uje ob\u00eds\u0165 kontrolu spr\u00e1vnosti adresy pou\u017e\u00edvanej v exploite na prenos pr\u00edkazu (kontrola neplat\u00ed pre adresy bez dom\u00e9ny, ako &#171;localuser-;command;&#187;). Druh\u00e1 zranite\u013enos\u0165 m\u00f4\u017ee by\u0165 pou\u017eit\u00e1 na kontrolu existencie s\u00faborov a prie\u010dinkov v syst\u00e9me, vr\u00e1tane t\u00fdch, ktor\u00e9 s\u00fa dostupn\u00e9 iba pre root (qmail-verify sa sp\u00fa\u0161\u0165a s pr\u00e1vami root), cez priame volanie lok\u00e1lneho spracovate\u013ea.<\/p>\n<p>Na ob\u00eddenie probl\u00e9mu odporu\u010dil Bernstein sp\u00fa\u0161\u0165a\u0165 procesy qmail s nastaven\u00edm spolo\u010dn\u00e9ho limitu na dostupn\u00fa pam\u00e4\u0165 (\"softlimit -m12345678\"), a v tomto pr\u00edpade je probl\u00e9m zablokovan\u00fd. Ako alternat\u00edvny sp\u00f4sob ochrany sa tie\u017e spom\u00edna obmedzenie maxim\u00e1lnej ve\u013ekosti spr\u00e1vy spracov\u00e1vanej prostredn\u00edctvom s\u00faboru \"control\/databytes\" (pod\u013ea predvolen\u00fdch nastaven\u00ed sa nevytv\u00e1ra a pri predvolenom nastaven\u00ed qmail zost\u00e1va zranite\u013en\u00fd). Okrem toho \"control\/databytes\" neochr\u00e1ni pred lok\u00e1lnymi \u00fatokmi od u\u017e\u00edvate\u013eov syst\u00e9mu, preto\u017ee obmedzenie sa zoh\u013ead\u0148uje iba v qmail-smtpd.<\/p>\n<p>Probl\u00e9m sa t\u00fdka bal\u00edka <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/source-package\/netqmail\">netqmail<\/a><\/noindex>, nach\u00e1dzaj\u00faci sa v repozit\u00e1roch Debian. Pre tento bal\u00edk bol pripraven\u00fd s\u00fabor patchov, ktor\u00fd rie\u0161i star\u00e9 zranite\u013enosti z roku 2005 (pridan\u00edm pevn\u00fdch limitov na pam\u00e4\u0165 do k\u00f3du pomocou funkcie alloc()), ako aj nov\u00e9 probl\u00e9my v qmail-verify. Samostatne <noindex><a rel=\"nofollow\" href=\"https:\/\/free.acrconsulting.co.uk\/email\/qmail-verify.html\">bol pripraven\u00fd<\/a><\/noindex> aktualizovan\u00e1 verzia patchu qmail-verify. V\u00fdvoj\u00e1ri <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51326\">vetvy<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/notqmail.org\/\">notqmail<\/a><\/noindex> pripravili svoje patche na blokovanie star\u00fdch probl\u00e9mov a taktie\u017e spustili pr\u00e1cu na odstr\u00e1nen\u00ed v\u0161etk\u00fdch mo\u017en\u00fdch celo\u010d\u00edseln\u00fdch preplnen\u00ed v k\u00f3de.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52991\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Qualys \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u0435 qmail, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u0435\u0449\u0451 \u0441 2005 \u0433\u043e\u0434\u0430 (CVE-2005-1513), \u043d\u043e \u043e\u0441\u0442\u0430\u0432\u0430\u0432\u0448\u0435\u0439\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439, \u0442\u0430\u043a \u043a\u0430\u043a \u0430\u0432\u0442\u043e\u0440 qmail \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0430\u043b \u043e \u043d\u0435\u0440\u0435\u0430\u043b\u0438\u0441\u0442\u0438\u0447\u043d\u043e\u0441\u0442\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0433\u043e \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0433 \u0431\u044b \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0412 Qualys \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u043e\u043f\u0440\u043e\u0432\u0435\u0440\u0433\u0430\u044e\u0449\u0438\u0439 \u0434\u0430\u043d\u043d\u043e\u0435 \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u0442\u044c [&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-82266","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=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Qualys \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta 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