{"id":123647,"date":"2025-04-25T03:05:14","date_gmt":"2025-04-25T01:05:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov"},"modified":"2025-04-25T03:05:14","modified_gmt":"2025-04-25T01:05:14","slug":"prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","title":{"rendered":"Linux rendszerhez k\u00e9sz\u00fclt rootkit protot\u00edpus, amely az io_uring-ot haszn\u00e1lja a rendszerh\u00edv\u00e1sok elemz\u0151inek megker\u00fcl\u00e9s\u00e9re","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az ARMO c\u00e9g kutat\u00f3i bemutatt\u00e1k, hogy lehets\u00e9ges olyan rootkitek l\u00e9trehoz\u00e1sa, amelyek nem haszn\u00e1lnak speci\u00e1lis rendszerh\u00edv\u00e1sokat tipikus m\u0171veletek, p\u00e9ld\u00e1ul f\u00e1jlok olvas\u00e1sa\/\u00edr\u00e1sa \u00e9s parancsok fogad\u00e1sa k\u00fcls\u0151 szerverekr\u0151l val\u00f3 v\u00e9grehajt\u00e1s\u00e1ra. A rendszerh\u00edv\u00e1sok helyett javasolt\u00e1k az io_uring aszinkron I\/O interf\u00e9sz haszn\u00e1lat\u00e1t, amely a Linux 5.1-t\u0151l kezdve t\u00e1mogatott. <\/p>\n

A m\u00f3dszer l\u00e9nyege abban rejlik, hogy a f\u00e1jlhozz\u00e1f\u00e9r\u00e9s \u00e9s a h\u00e1l\u00f3zati m\u0171veletek (read\/write, recv\/send\/connect\/bind\/listen) k\u00fcl\u00f6n rendszerh\u00edv\u00e1sai helyett \u00e1ltal\u00e1nos rendszerh\u00edv\u00e1sokat (io_uring_enter, io_uring_setup, io_uring_register stb.) lehet haszn\u00e1lni, amelyeket a hagyom\u00e1nyos rosszindulat\u00fa tev\u00e9kenys\u00e9gek azonos\u00edt\u00e1s\u00e1ra szolg\u00e1l\u00f3 eszk\u00f6z\u00f6k nem elemeznek. Az io_uring interf\u00e9sz k\u00f6r\u00fclbel\u00fcl 60 k\u00fcl\u00f6nb\u00f6z\u0151 m\u0171veletet t\u00e1mogat. Fejleszt\u00e9s alatt \u00e1ll egy lehet\u0151s\u00e9g, amely lehet\u0151v\u00e9 teszi \u00faj folyamatok ind\u00edt\u00e1s\u00e1t io_uring-on kereszt\u00fcl. <\/p>\n

A m\u00f3dszer m\u0171k\u00f6d\u00e9s\u00e9nek bemutat\u00e1s\u00e1ra egy Curing nev\u0171 rootkit protot\u00edpust k\u00e9sz\u00edtettek, amely v\u00e9grehajt ilyen m\u0171veleteket, mint parancsok fogad\u00e1sa k\u00fcls\u0151 a szerver<\/a> \u00e9s f\u00e1jlok \u00e1tvitele\/m\u00f3dos\u00edt\u00e1sa. A bemutat\u00f3ban a TCP 8888-as portj\u00e1ra \u00e9rkez\u0151 k\u00e9r\u00e9st k\u00fcldt\u00fck el egy k\u00fcls\u0151 gazdag\u00e9pnek, \u00e9s a « \/etc\/shadow » f\u00e1jl tartalm\u00e1t is. Felt\u00e9telezz\u00fck, hogy a rendszer sikeres kompromitt\u00e1l\u00e1sa \u00e9s a root jogok megszerz\u00e9se ut\u00e1n a t\u00e1mad\u00f3 rootkitet telep\u00edt a meghekkelts rendszerben val\u00f3 tart\u00f3zkod\u00e1s\u00e1nak megszil\u00e1rd\u00edt\u00e1s\u00e1ra. <\/p>\n

A v\u00e9grehajtott k\u00eds\u00e9rlet sor\u00e1n a Curing rootkit aktivit\u00e1sa nem volt \u00e9szlelhet\u0151 a Falco \u00e9s Tetragon monitoring eszk\u00f6z\u00f6k \u00e1ltal, amelyek a biztons\u00e1gi anom\u00e1li\u00e1k azonos\u00edt\u00e1s\u00e1ra haszn\u00e1latosak hosztokon \u00e9s kont\u00e9nereken (Kubernetes alap\u00fa infrastrukt\u00far\u00e1val val\u00f3 integr\u00e1ci\u00f3 t\u00e1mogatott). Ezek az eszk\u00f6z\u00f6k a rendszerh\u00edv\u00e1sok elfog\u00e1s\u00e1val elemzik az olyan esem\u00e9nyeket, mint a folyamatok ind\u00edt\u00e1sa, h\u00e1l\u00f3zati aktivit\u00e1s \u00e9s f\u00e1jlkezel\u00e9s, de nem veszik figyelembe az io_uring alrendszer haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9g\u00e9t ilyen m\u0171veletekhez. A Linux sz\u00e1m\u00e1ra el\u00e9rhet\u0151 kereskedelmi biztons\u00e1gi esem\u00e9nyek \u00e9s incidensek \u00e9szlel\u00e9s\u00e9re \u00e9s kezel\u00e9s\u00e9re szolg\u00e1l\u00f3 rendszerek t\u00f6bbs\u00e9ge szint\u00e9n a rendszerh\u00edv\u00e1sok elfog\u00e1s\u00e1ra alapoz. <\/p>\n

A h\u00e1l\u00f3zati \u00e9s f\u00e1jlaktivit\u00e1s k\u00f6vet\u00e9s\u00e9re szolg\u00e1l\u00f3 eszk\u00f6z\u00f6k megker\u00fcl\u00e9s\u00e9nek elker\u00fcl\u00e9se \u00e9rdek\u00e9ben javasolt a KRSI (Kernel Runtime Security Instrumentation) mechanizmus haszn\u00e1lata, amely a Linux 5.7 kernelben jelent meg, \u00e9s lehet\u0151v\u00e9 teszi BPF-programok csatol\u00e1s\u00e1t b\u00e1rmely LSM-horogra. P\u00e9ld\u00e1ul a KRSI az LSM-horog szintj\u00e9n lehet\u0151s\u00e9get ad a f\u00e1jlokkal kapcsolatos m\u0171veletek, a h\u00e1l\u00f3zati hozz\u00e1f\u00e9r\u00e9s \u00e9s a folyamatok ind\u00edt\u00e1s\u00e1nak nyomon k\u00f6vet\u00e9s\u00e9re, f\u00fcggetlen\u00fcl att\u00f3l, hogy ezek a m\u0171veletek specifikus rendszerh\u00edv\u00e1sokon vagy io_uringon kereszt\u00fcl lettek kezdem\u00e9nyezve. <\/p>\n

Kor\u00e1bban az io_uring alrendszer kritik\u00e1k keresztt\u00fcz\u00e9be ker\u00fclt, mert rendszeresen komoly sebezhet\u0151s\u00e9gek bukkantak fel. A felhaszn\u00e1l\u00f3k k\u00e9r\u00e9s\u00e9re, akik egyszer\u0171 eszk\u00f6zt k\u00edv\u00e1ntak az io_uring letilt\u00e1s\u00e1ra an\u00e9lk\u00fcl, hogy a kernelt \u00fajra kellene \u00e9p\u00edteni, a Linux 6.6 kernelbe beker\u00fclt az io_uring_disabled sysctl. A Google alap\u00e9rtelmez\u00e9s szerint letiltotta az io_uring-ot a ChromeOS-ben, Androidon \u00e9s az szervereken<\/a>, magyar\u00e1zva, hogy az io_uring biztons\u00e1gi helyzete annyira siralmas, hogy fel\u00fclm\u00falja az io_uring alkalmaz\u00e1s\u00e1nak teljes\u00edtm\u00e9nyn\u00f6vel\u0151 el\u0151nyeit.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 ARMO \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0440\u0443\u0442\u043a\u0438\u0442\u043e\u0432, \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u0432\u044b\u0437\u043e\u0432\u044b \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a \u0447\u0442\u0435\u043d\u0438\u0435\/\u0437\u0430\u043f\u0438\u0441\u044c \u0444\u0430\u0439\u043b\u043e\u0432 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\u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.1. \u0421\u0443\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u0430 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0432\u043c\u0435\u0441\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 […]<\/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-123647","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\udd47Protot\u00edpus rootkit Linuxra, amely az io_uring-ot haszn\u00e1l a rendszerh\u00edv\u00e1s-elemz\u0151k megker\u00fcl\u00e9s\u00e9re | 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