{"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\/cs\/blog\/news\/uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares","title":{"rendered":"Zranitelnosti v s\u00ed\u0165ov\u00e9m konfigur\u00e1toru ConnMan a DNS knihovn\u011b c-ares.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V s\u00ed\u0165ov\u00e9m konfigur\u00e1toru ConnMan, kter\u00fd se roz\u0161\u00ed\u0159il v zabudovan\u00fdch Linuxov\u00fdch syst\u00e9mech, automobilov\u00fdch platform\u00e1ch a za\u0159\u00edzen\u00edch internetu v\u011bc\u00ed, byla zji\u0161t\u011bna zranitelnost (CVE-2025-32743), kter\u00e1 m\u016f\u017ee potenci\u00e1ln\u011b v\u00e9st k vykon\u00e1n\u00ed k\u00f3du p\u0159i zpracov\u00e1n\u00ed speci\u00e1ln\u011b upraven\u00fdch odpov\u011bd\u00ed ze serveru DNS. Byla p\u0159i\u0159azena kritick\u00e1 \u00farove\u0148 nebezpe\u010dnosti (9.1 z 10). Zranitelnost se projevuje a\u017e do aktu\u00e1ln\u00ed verze ConnMan 1.44 a zat\u00edm z\u016fst\u00e1v\u00e1 neopraven\u00e1. <\/p>\n

Zranitelnost se vyskytuje v implementaci DNS proxy a je zp\u016fsobena t\u00edm, \u017ee p\u0159i zpracov\u00e1n\u00ed DNS odpov\u011bdi s bitem TC (Truncated) \u0159et\u011bzec «lookup» ve funkci ns_resolv z\u016fst\u00e1v\u00e1 pr\u00e1zdn\u00fd nebo m\u00e1 hodnotu NULL. V d\u016fsledku toho doch\u00e1z\u00ed k p\u0159ete\u010den\u00ed vyrovn\u00e1vac\u00ed pam\u011bti kv\u016fli nespr\u00e1vn\u00e9mu v\u00fdpo\u010dtu velikosti dat kop\u00edrovan\u00fdch pomoc\u00ed funkce memcpy. <\/p>\n

D\u00e1le je t\u0159eba zm\u00ednit zranitelnost (CVE-2025-31498) v knihovn\u011b c-ares, kter\u00e1 je ur\u010dena pro odes\u00edl\u00e1n\u00ed DNS dotaz\u016f asynchronn\u00edm zp\u016fsobem. Tato zranitelnost je zp\u016fsobena p\u0159\u00edstupem k ji\u017e uvoln\u011bn\u00e9 oblasti pam\u011bti (use-after-free) ve funkci zpracov\u00e1n\u00ed odpov\u011bd\u00ed serveru DNS. <\/p>\n

Probl\u00e9m je zp\u016fsoben t\u00edm, \u017ee v p\u0159\u00edpad\u011b p\u0159eru\u0161en\u00ed spojen\u00ed m\u016f\u017ee nastat situace, kdy je deskriptor spojen\u00ed ji\u017e uvoln\u011bn, ale funkce read_answers() domn\u00edv\u00e1, \u017ee je st\u00e1le dostupn\u00fd p\u0159i v\u00fdjimce z fronty jin\u00fdch dotaz\u016f. Vyu\u017eit\u00ed zranitelnosti je zt\u00ed\u017eeno t\u00edm, \u017ee \u00fato\u010dn\u00edk mus\u00ed kontrolovat DNS server, p\u0159es kter\u00fd doch\u00e1z\u00ed k resolvov\u00e1n\u00ed, a vytvo\u0159it podm\u00ednky pro selh\u00e1n\u00ed vol\u00e1n\u00ed send()\/write(), co\u017e je teoreticky mo\u017en\u00e9 p\u0159i zahlcen\u00ed ob\u011bti pakety ICMP UNREACHABLE. <\/p>\n

Zranitelnost m\u016f\u017ee b\u00fdt pou\u017eita k \u00fatok\u016fm na projekty, kter\u00e9 pou\u017e\u00edvaj\u00ed knihovnu c-ares. Nap\u0159\u00edklad c-ares se pou\u017e\u00edv\u00e1 v Node.js, sssd, apt-cacher-ng, wireshark, pgbouncer, shadowsocks, zephyr, sysdig a frr. Probl\u00e9m se projevuje od verze 1.32.3 (\u010dervenec 2024) a byl odstran\u011bn v aktualizaci c-ares 1.34.5. Sledovat odstran\u011bn\u00ed zranitelnosti v distribuc\u00edch lze na n\u00e1sleduj\u00edc\u00edch str\u00e1nk\u00e1ch: 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\udd47Zranitelnosti v s\u00ed\u0165ov\u00e9m konfigur\u00e1toru ConnMan a DNS knihovn\u011b c-ares | ProHoster","description":"V s\u00ed\u0165ov\u00e9m konfigur\u00e1toru ConnMan, kter\u00fd se roz\u0161\u00ed\u0159il v zabudovan\u00fdch Linuxov\u00fdch syst\u00e9mech, automobilov\u00fdch platform\u00e1ch a za\u0159\u00edzen\u00edch internetu v\u011bc\u00ed, byla zji\u0161t\u011bna zranitelnost (CVE-2025-32743), kter\u00e1 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\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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