{"id":102953,"date":"2022-01-13T15:37:33","date_gmt":"2022-01-13T13:37:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d0%b8-%d0%b2-systemd-flatpak-samba-freerdp-clamav-node-js"},"modified":"2022-01-13T15:37:33","modified_gmt":"2022-01-13T13:37:33","slug":"uyazvimosti-v-systemd-flatpak-samba-freerdp-clamav-node-js","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-v-systemd-flatpak-samba-freerdp-clamav-node-js","title":{"rendered":"\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432  systemd, Flatpak, Samba, FreeRDP, Clamav, Node.js","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ve utilit\u011b systemd-tmpfiles, kter\u00e1 je sou\u010d\u00e1st\u00ed systemd, byla objevena zranitelnost (CVE-2021-3997), kter\u00e1 umo\u017e\u0148uje vyvol\u00e1n\u00ed nekontrolovan\u00e9 rekurze. Tuto chybu lze pou\u017e\u00edt k organizaci \u00fatoku typu DoS p\u0159i spu\u0161t\u011bn\u00ed syst\u00e9mu t\u00edm, \u017ee se v adres\u00e1\u0159i \/tmp vytvo\u0159\u00ed velk\u00e9 mno\u017estv\u00ed podadres\u00e1\u0159\u016f. Oprava je zat\u00edm k dispozici ve form\u011b patche. Aktualizace bal\u00ed\u010dk\u016f s odstran\u011bn\u00edm probl\u00e9mu byly navr\u017eeny pro Ubuntu a SUSE, ale zat\u00edm nejsou dostupn\u00e9 pro Debian, RHEL a Fedora (opravy jsou ve f\u00e1zi testov\u00e1n\u00ed).     <\/p>\n<p>P\u0159i vytv\u00e1\u0159en\u00ed tis\u00edc\u016f vno\u0159en\u00fdch adres\u00e1\u0159\u016f prov\u00e1d\u011bn\u00ed operace \u201esystemd-tmpfiles --remove\u201c kon\u010d\u00ed hav\u00e1ri\u00ed kv\u016fli vy\u010derp\u00e1n\u00ed z\u00e1sobn\u00edku. Obvykle n\u00e1stroj systemd-tmpfiles prov\u00e1d\u00ed v jednom vol\u00e1n\u00ed operace odstra\u0148ov\u00e1n\u00ed a vytv\u00e1\u0159en\u00ed adres\u00e1\u0159\u016f (\u201esystemd-tmpfiles --create --remove --boot --exclude-prefix=\/dev\u201c), p\u0159i\u010dem\u017e zpo\u010d\u00e1tku prob\u00edh\u00e1 odstra\u0148ov\u00e1n\u00ed a pot\u00e9 vytv\u00e1\u0159en\u00ed, tedy p\u00e1d ve f\u00e1zi odstra\u0148ov\u00e1n\u00ed povede k tomu, \u017ee nebudou vytvo\u0159eny d\u016fle\u017eit\u00e9 soubory pot\u0159ebn\u00e9 k fungov\u00e1n\u00ed, uveden\u00e9 v \/usr\/lib\/tmpfiles.d\/*.conf.      <\/p>\n<p>Je tak\u00e9 zm\u00edn\u011bn nebezpe\u010dn\u011bj\u0161\u00ed sc\u00e9n\u00e1\u0159 \u00fatoku na Ubuntu 21.04: proto\u017ee p\u0159i hav\u00e1rii systemd-tmpfiles nen\u00ed vytvo\u0159en soubor \/run\/lock\/subsys a adres\u00e1\u0159 \/run\/lock umo\u017e\u0148uje z\u00e1pis pro v\u0161echny u\u017eivatele, \u00fato\u010dn\u00edk m\u016f\u017ee vytvo\u0159it adres\u00e1\u0159 \/run\/lock\/subsys pod sv\u00fdm identifik\u00e1torem a prost\u0159ednictv\u00edm vytv\u00e1\u0159en\u00ed symbolick\u00fdch odkaz\u016f, kter\u00e9 se p\u0159ekr\u00fdvaj\u00ed s lock-soubory od syst\u00e9mov\u00fdch proces\u016f, zorganizovat p\u0159epis syst\u00e9mov\u00fdch soubor\u016f.     <\/p>\n<p>D\u00e1le stoj\u00ed za zm\u00ednku zve\u0159ejn\u011bn\u00ed nov\u00fdch verz\u00ed projekt\u016f Flatpak, Samba, FreeRDP, Clamav a Node.js, ve kter\u00fdch byly odstran\u011bny zranitelnosti:    <\/p>\n<ul>\n<li class=\"l\"> V oprav\u00e1rensk\u00fdch verz\u00edch n\u00e1stroje pro sestavov\u00e1n\u00ed sob\u011bsta\u010dn\u00fdch bal\u00ed\u010dk\u016f Flatpak 1.10.6 a 1.12.3 byly odstran\u011bny dv\u011b zranitelnosti: Prvn\u00ed zranitelnost (CVE-2021-43860) umo\u017e\u0148uje p\u0159i stahov\u00e1n\u00ed bal\u00ed\u010dku z neov\u011b\u0159en\u00e9ho \u00falo\u017ei\u0161t\u011b pomoc\u00ed manipulace s metadaty skr\u00fdt zobrazen\u00ed ur\u010dit\u00fdch roz\u0161\u00ed\u0159en\u00fdch opr\u00e1vn\u011bn\u00ed v pr\u016fb\u011bhu instalace. Druh\u00e1 zranitelnost (bez CVE) umo\u017e\u0148uje b\u011bhem sestavov\u00e1n\u00ed bal\u00ed\u010dku pomoc\u00ed p\u0159\u00edkazu \u201eflatpak-builder --mirror-screenshots-url\u201c vytv\u00e1\u0159et adres\u00e1\u0159e v souborov\u00e9m syst\u00e9mu mimo adres\u00e1\u0159 sestaven\u00ed.\n<li class=\"l\">V aktualizaci Samba 4.13.16 byla odstran\u011bna zranitelnost (CVE-2021-43566), kter\u00e1 umo\u017e\u0148uje klientovi p\u0159es manipulace se symbolick\u00fdmi odkazy na odd\u00edlech SMB1 nebo NFS dos\u00e1hnout vytvo\u0159en\u00ed na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-newyork\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2695\">serveru<\/a> katalogu mimo exportovanou oblast FS (probl\u00e9m je zp\u016fsoben stavem z\u00e1vodu a je obt\u00ed\u017en\u011b provediteln\u00fd v praxi, ale teoreticky mo\u017en\u00fd). Probl\u00e9mu podl\u00e9haj\u00ed verze do 4.13.16.\n<p>Tak\u00e9 byl zve\u0159ejn\u011bn report o dal\u0161\u00ed podobn\u00e9 zranitelnosti (CVE-2021-20316), kter\u00e1 umo\u017e\u0148uje autentizovan\u00e9mu klientovi pomoc\u00ed manipulace s symbolick\u00fdmi odkazy p\u0159e\u010d\u00edst nebo zm\u011bnit obsah souboru nebo metadata adres\u00e1\u0159e v oblasti FS. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-los-angeles\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3788\">serveru<\/a> mimo exportovanou \u010d\u00e1st. Probl\u00e9m byl odstran\u011bn ve verzi 4.15.0, ale t\u00fdk\u00e1 se i star\u0161\u00edch v\u011btv\u00ed. Opravy pro star\u0161\u00ed v\u011btve v\u0161ak nebudou zve\u0159ejn\u011bny, proto\u017ee star\u00e1 architektura Samba VFS neumo\u017e\u0148uje probl\u00e9m vy\u0159e\u0161it kv\u016fli vazb\u00e1m operac\u00ed s metadata na cest\u00e1ch soubor\u016f (ve Samba 4.15 byl VFS vrstva zcela p\u0159epracov\u00e1na). Nebezpe\u010dnost probl\u00e9mu sni\u017euje to, \u017ee je dost slo\u017eit\u00fd na exploitaci a u\u017eivatelsk\u00e1 pr\u00e1va mus\u00ed umo\u017e\u0148ovat \u010dten\u00ed nebo z\u00e1pis do c\u00edlov\u00e9ho souboru nebo adres\u00e1\u0159e.      <\/p>\n<li class=\"l\"> Ve vyd\u00e1n\u00ed projektu FreeRDP 2.5, kter\u00e9 nab\u00edz\u00ed svobodnou implementaci protokolu vzd\u00e1len\u00e9ho p\u0159\u00edstupu k desktopu RDP (Remote Desktop Protocol), byly odstran\u011bny t\u0159i bezpe\u010dnostn\u00ed probl\u00e9my (identifik\u00e1tory CVE nebyly p\u0159i\u0159azeny), kter\u00e9 mohou v\u00e9st k p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku p\u0159i pou\u017eit\u00ed nespr\u00e1vn\u00e9 lokalizace, zpracov\u00e1n\u00ed speci\u00e1ln\u011b vytvo\u0159en\u00fdch parametr\u016f registru a uveden\u00ed nespr\u00e1vn\u011b form\u00e1tovan\u00e9ho n\u00e1zvu pluginu. Mezi zm\u011bnami v nov\u00e9 verzi je podpora knihovny OpenSSL 3.0, implementace nastaven\u00ed TcpConnectTimeout, zlep\u0161en\u00ed kompatibility s LibreSSL a \u0159e\u0161en\u00ed probl\u00e9m\u016f se schr\u00e1nkou v prost\u0159ed\u00edch zalo\u017een\u00fdch na Waylandu.\n<li class=\"l\"> V nov\u00fdch vyd\u00e1n\u00edch svobodn\u00e9ho antivirov\u00e9ho bal\u00ed\u010dku ClamAV 0.103.5 a 0.104.2 byla odstran\u011bna zranitelnost CVE-2022-20698, spojen\u00e1 s nespr\u00e1vn\u00fdm \u010dten\u00edm ukazatele, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 vyvol\u00e1n\u00ed p\u00e1du procesu, pokud bude bal\u00ed\u010dek zkompilov\u00e1n s knihovnou libjson-c a v nastaven\u00ed bude aktivov\u00e1na mo\u017enost CL_SCAN_GENERAL_COLLECT_METADATA (clamscan --gen-json).\n<li class=\"l\"> Ve verz\u00edch platformy Node.js 16.13.2, 14.18.3, 17.3.1 a 12.22.9 byly odstran\u011bny \u010dty\u0159i zranitelnosti: obch\u00e1zen\u00ed kontroly certifik\u00e1tu p\u0159i ov\u011b\u0159ov\u00e1n\u00ed s\u00ed\u0165ov\u00e9ho spojen\u00ed kv\u016fli nespr\u00e1vn\u00e9mu p\u0159evodu SAN (Subject Alternative Names) do \u0159et\u011bzcov\u00e9ho form\u00e1tu (CVE-2021-44532); nespr\u00e1vn\u00e9 zpracov\u00e1n\u00ed v\u00fd\u010dtu n\u011bkolika hodnot v pol\u00edch subject a issuer, kter\u00e9 m\u016f\u017ee b\u00fdt pou\u017eito k obch\u00e1zen\u00ed kontroly uveden\u00fdch pol\u00ed v certifik\u00e1tech (CVE-2021-44533); obch\u00e1zen\u00ed omezen\u00ed souvisej\u00edc\u00edch s typem SAN-URI v certifik\u00e1tech (CVE-2021-44531); nedostate\u010dn\u00e1 kontrola vstupn\u00edch dat v funkci console.table(), kter\u00e1 m\u016f\u017ee b\u00fdt vyu\u017eita k p\u0159i\u0159azen\u00ed pr\u00e1zdn\u00fdch \u0159et\u011bzc\u016f k \u010d\u00edseln\u00fdm kl\u00ed\u010d\u016fm (CVE-2022-21824).          <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56498\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 systemd \u0443\u0442\u0438\u043b\u0438\u0442\u0435 systemd-tmpfiles \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3997), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043d\u0435\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u0443\u0435\u043c\u0443\u044e \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u044e. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043e\u0442\u043a\u0430\u0437\u0430 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0447\u0435\u0440\u0435\u0437 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0432 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0435 \/tmp \u0431\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u0447\u0438\u0441\u043b\u0430 \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043f\u043e\u0434\u043a\u0430\u0442\u0430\u043b\u043e\u0433\u043e\u0432. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0432 \u0444\u043e\u0440\u043c\u0435 \u043f\u0430\u0442\u0447\u0430. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u0432 Ubuntu \u0438 SUSE, \u043d\u043e \u043f\u043e\u043a\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0432 [&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-102953","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=\"\u0412\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 systemd \u0443\u0442\u0438\u043b\u0438\u0442\u0435 systemd-tmpfiles \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3997), 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