{"id":123470,"date":"2025-04-11T15:05:06","date_gmt":"2025-04-11T13:05:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares"},"modified":"2025-04-11T15:05:06","modified_gmt":"2025-04-11T13:05:06","slug":"uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares","title":{"rendered":"Zranite\u013enosti v sie\u0165ovom konfigur\u00e1tore ConnMan a DNS kni\u017enici c-ares","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V sie\u0165ovom konfigur\u00e1tore ConnMan, ktor\u00fd sa roz\u0161\u00edril vo vstavan\u00fdch Linux-syst\u00e9moch, automobilov\u00fdch platform\u00e1ch a zariadeniach internetu vec\u00ed, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2025-32743), ktor\u00e1 potenci\u00e1lne m\u00f4\u017ee vies\u0165 k vykonaniu k\u00f3du pri spracovan\u00ed \u0161peci\u00e1lne form\u00e1tovan\u00fdch odpoved\u00ed od DNS servera. Probl\u00e9m dostal kritick\u00fa \u00farove\u0148 nebezpe\u010denstva (9.1 z 10). Zranite\u013enos\u0165 sa prejavuje a\u017e do aktu\u00e1lneho vydania ConnMan 1.44 a zatia\u013e ost\u00e1va neopravena. <\/p>\n

Zranite\u013enos\u0165 sa nach\u00e1dza v implement\u00e1cii DNS proxy a je sp\u00f4soben\u00e1 t\u00fdm, \u017ee pri spracovan\u00ed DNS odpovede s bitom TC (Truncated) zost\u00e1va re\u0165azec «lookup» vo funkcii ns_resolv pr\u00e1zdny alebo m\u00e1 hodnotu NULL. To n\u00e1sledne vedie k prete\u010deniu vyrovn\u00e1vacej pam\u00e4te v d\u00f4sledku nespr\u00e1vneho v\u00fdpo\u010dtu ve\u013ekosti \u00fadajov kop\u00edrovan\u00fdch pomocou funkcie memcpy. <\/p>\n

\u010eal\u0161ou zranite\u013enos\u0165ou (CVE-2025-31498) je v kni\u017enici c-ares, ktor\u00e1 je ur\u010den\u00e1 na odosielanie DNS dopytov asynchr\u00f3nne. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 pr\u00edstupom k u\u017e uvo\u013enenej oblasti pam\u00e4te (use-after-free) vo funkcii spracovania odpoved\u00ed DNS servera. <\/p>\n

Probl\u00e9m je sp\u00f4soben\u00fd t\u00fdm, \u017ee v pr\u00edpade preru\u0161enia pripojenia m\u00f4\u017ee nasta\u0165 situ\u00e1cia, ke\u010f je deskriptor spojenia u\u017e uvo\u013enen\u00fd, ale funkcia read_answers() si mysl\u00ed, \u017ee je e\u0161te dostupn\u00fd pri v\u00fdnimke z radu in\u00fdch dopytov. Vyu\u017eitie zranite\u013enosti je s\u0165a\u017een\u00e9 t\u00fdm, \u017ee \u00fato\u010dn\u00edk mus\u00ed kontrolova\u0165 DNS server, cez ktor\u00fd sa vykon\u00e1va rezolvovanie, a vytvori\u0165 podmienky pre ukon\u010denie ch\u00fdb pri volaniach send()\/write(), \u010do teoreticky je mo\u017en\u00e9 pri zahlten\u00ed obete paketmi ICMP UNREACHABLE. <\/p>\n

Zranite\u013enos\u0165 m\u00f4\u017ee by\u0165 vyu\u017eit\u00e1 na \u00fatok proti projektom, ktor\u00e9 pou\u017e\u00edvaj\u00fa kni\u017enicu c-ares. Napr\u00edklad c-ares sa pou\u017e\u00edva v Node.js, sssd, apt-cacher-ng, wireshark, pgbouncer, shadowsocks, zephyr, sysdig a frr. Probl\u00e9m sa prejavuje od vydania 1.32.3 (j\u00fal 2024) a bol odstr\u00e1nen\u00fd v aktualiz\u00e1cii c-ares 1.34.5. Sledova\u0165 odstr\u00e1nenie zranite\u013enosti v distrib\u00faci\u00e1ch je mo\u017en\u00e9 na nasleduj\u00facich str\u00e1nkach: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0442\u043e\u0440\u0435 ConnMan, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u043c \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 Linux-\u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0430\u0432\u0442\u043e\u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u0445 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430 \u0432\u0435\u0449\u0435\u0439, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-32743), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\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\u044b\u0445 \u043e\u0442\u0432\u0435\u0442\u043e\u0432 \u043e\u0442 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (9.1 \u0438\u0437 10). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u043f\u043b\u043e\u0442\u044c \u0434\u043e \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 ConnMan 1.44 \u0438 \u043f\u043e\u043a\u0430 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 […]<\/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-123470","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranite\u013enosti v sie\u0165ovom konfigur\u00e1tore ConnMan a DNS kni\u017enici c-ares | ProHoster","description":"V sie\u0165ovom konfigur\u00e1tore ConnMan, ktor\u00fd sa roz\u0161\u00edril vo vstavan\u00fdch Linux-syst\u00e9moch, automobilov\u00fdch platform\u00e1ch a zariadeniach internetu vec\u00ed, bola zisten\u00e1 zranite\u013enos\u0165 (CVE-2025-32743), ktor\u00e1 potenci\u00e1lne m\u00f4\u017ee.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0442\u043e\u0440\u0435 ConnMan \u0438 DNS-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 c-ares | ProHoster","og:description":"\u0412 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0442\u043e\u0440\u0435 ConnMan, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0435\u043c \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0432\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 Linux-\u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0430\u0432\u0442\u043e\u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430\u0445 \u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430 \u0432\u0435\u0449\u0435\u0439, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-32743), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e 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