{"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\/hu\/blog\/news\/uyazvimosti-v-setevom-konfiguratore-connman-i-dns-biblioteke-c-ares","title":{"rendered":"S\u00e9r\u00fcl\u00e9kenys\u00e9gek a ConnMan h\u00e1l\u00f3zati konfigur\u00e1torban \u00e9s a c-ares DNS k\u00f6nyvt\u00e1rban.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A ConnMan h\u00e1l\u00f3zati konfigur\u00e1torban, amely elterjedt be\u00e1gyazott Linux rendszerekben, aut\u00f3platformokon \u00e9s IoT eszk\u00f6z\u00f6kben, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get fedeztek fel (CVE-2025-32743), amely potenci\u00e1lisan lehet\u0151v\u00e9 teheti a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a DNS-kiszolg\u00e1l\u00f3t\u00f3l \u00e9rkez\u0151 speci\u00e1lisan form\u00e1zott v\u00e1laszok feldolgoz\u00e1sa sor\u00e1n. A probl\u00e9ma kritikus vesz\u00e9lyess\u00e9gi szintet kapott (9.1 a 10-b\u0151l). A s\u00e9r\u00fcl\u00e9kenys\u00e9g a ConnMan 1.44-es verzi\u00f3j\u00e1ig jelentkezik, \u00e9s egyel\u0151re nem jav\u00edtott\u00e1k ki. <\/p>\n

A sebezhet\u0151s\u00e9g a DNS proxy megval\u00f3s\u00edt\u00e1s\u00e1ban tal\u00e1lhat\u00f3, \u00e9s abb\u00f3l ered, hogy a DNS-v\u00e1lasz TC (Truncated) bitj\u00e9nek feldolgoz\u00e1sa sor\u00e1n az \"lookup\" v\u00e1ltoz\u00f3 az ns_resolv f\u00fcggv\u00e9nyben \u00fcres marad vagy NULL \u00e9rt\u00e9ket kap. Ez k\u00e9s\u0151bb puffer overflowhoz vezet a m\u00e1solt adatok m\u00e9ret\u00e9nek hib\u00e1s kisz\u00e1m\u00edt\u00e1sa miatt, amit a memcpy f\u00fcggv\u00e9ny haszn\u00e1l. <\/p>\n

Ezen k\u00edv\u00fcl eml\u00edt\u00e9st \u00e9rdemel a c-ares k\u00f6nyvt\u00e1rban felfedezett s\u00e9r\u00fcl\u00e9kenys\u00e9g (CVE-2025-31498), amely DNS-k\u00e9relmek aszinkron m\u00f3don t\u00f6rt\u00e9n\u0151 k\u00fcld\u00e9s\u00e9re szolg\u00e1l. A s\u00e9r\u00fcl\u00e9kenys\u00e9get a m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclethez t\u00f6rt\u00e9n\u0151 hozz\u00e1f\u00e9r\u00e9s (use-after-free) okozza a DNS-kiszolg\u00e1l\u00f3 v\u00e1laszainak feldolgoz\u00f3 funkci\u00f3j\u00e1ban. <\/p>\n

A probl\u00e9ma abb\u00f3l ad\u00f3dik, hogy a kapcsolat megszakad\u00e1sa eset\u00e9n el\u0151fordulhat, hogy a kapcsolat le\u00edr\u00f3ja m\u00e1r felszabadult, de a read_answers() f\u00fcggv\u00e9ny azt hiszi, hogy m\u00e9g mindig el\u00e9rhet\u0151, amikor m\u00e1s k\u00e9r\u00e9sek kivezet\u00e9s\u00e9r\u0151l van sz\u00f3 a sorb\u00f3l. A s\u00e9r\u00fcl\u00e9kenys\u00e9g kihaszn\u00e1l\u00e1sa neh\u00e9zs\u00e9gekbe \u00fctk\u00f6zik, mivel a t\u00e1mad\u00f3nak ir\u00e1ny\u00edtania kell a DNS-kiszolg\u00e1l\u00f3t, amelyen kereszt\u00fcl a felold\u00e1s t\u00f6rt\u00e9nik, \u00e9s olyan k\u00f6r\u00fclm\u00e9nyeket kell teremtenie, amelyek a send()\/write() h\u00edv\u00e1sok hib\u00e1val val\u00f3 befejez\u00e9s\u00e9hez vezetnek, ami elm\u00e9letileg lehets\u00e9ges, ha ICMP UNREACHABLE csomagokkal terhelik a c\u00e9lt. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g kihaszn\u00e1lhat\u00f3 olyan projektek ellen, amelyek a c-ares k\u00f6nyvt\u00e1rat alkalmazz\u00e1k. P\u00e9ld\u00e1ul a c-ares haszn\u00e1latban van a Node.js, sssd, apt-cacher-ng, wireshark, pgbouncer, shadowsocks, zephyr, sysdig \u00e9s frr eset\u00e9ben. A probl\u00e9ma a 1.32.3-as verzi\u00f3t\u00f3l (2024 j\u00falius) jelentkezik, \u00e9s a c-ares 1.34.5 friss\u00edt\u00e9s\u00e9ben sz\u00fcntett\u00e9k meg. A s\u00e9r\u00fcl\u00e9kenys\u00e9g elh\u00e1r\u00edt\u00e1s\u00e1nak nyomon k\u00f6vet\u00e9s\u00e9hez a disztrib\u00faci\u00f3k k\u00f6vetkez\u0151 oldalain lehet t\u00e1j\u00e9koz\u00f3dni: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD.
\n
Forr\u00e1s: 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\udd47S\u00e9r\u00fcl\u00e9kenys\u00e9gek a ConnMan h\u00e1l\u00f3zati konfigur\u00e1torban \u00e9s a c-ares DNS k\u00f6nyvt\u00e1rban | ProHoster","description":"A ConnMan h\u00e1l\u00f3zati konfigur\u00e1torban, amely elterjedt be\u00e1gyazott Linux rendszerekben, aut\u00f3platformokon \u00e9s IoT eszk\u00f6z\u00f6kben, egy s\u00e9r\u00fcl\u00e9kenys\u00e9get fedeztek fel (CVE-2025-32743), amely potenci\u00e1lisan 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\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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