{"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\/et\/blog\/news\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","title":{"rendered":"Linuxi jaoks m\u00f5eldud rootkit protot\u00fc\u00fcp, mis kasutab io_uringi s\u00fcsteemikutsumise anal\u00fcsaatorite v\u00e4ltimiseks.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

ARMO teadlased demonstreerisid, et on v\u00f5imalik luua rootkit'e, mis ei kasuta spetsiifilisi s\u00fcsteemi kutsungite, n\u00e4iteks failide lugemise\/kirjutamise ning k\u00e4skude vastuv\u00f5tmise v\u00e4lisest serverist, t\u00e4itmiseks. Selle asemel on soovitatud kasutada io_uring as\u00fcnkroonse sisendi\/v\u00e4ljundi liidest, mida toetatakse alates Linuxi tuumast 5.1. <\/p>\n

Meetodi olemus seisneb selles, et failidele juurdep\u00e4\u00e4su ja v\u00f5rgutegevuste (read\/write, recv\/send\/connect\/bind\/listen) jaoks ei pea kasutama eraldi s\u00fcsteemi kutsunge, vaid saab kasutada \u00fcldisi s\u00fcsteemi kutsunge io_uring (io_uring_enter, io_uring_setup, io_uring_register jne), mida t\u00fc\u00fcpilised t\u00f6\u00f6riistad kahjuliku tegevuse tuvastamiseks ei anal\u00fc\u00fcsi. Io_uringi liides toetab umbes 60 erinevat operatsiooni. T\u00f6\u00f6s on v\u00f5imalus, mis v\u00f5imaldab k\u00e4ivitada uusi protsesse io_uring'i kaudu. <\/p>\n

Meetodi demonstreerimiseks on valmistatud protot\u00fc\u00fcp rootkit'ist Curing, mis t\u00e4idab selliseid tegevusi nagu k\u00e4skude vastuv\u00f5tmine v\u00e4lisest serverilt<\/a> \u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0430\/\u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0444\u0430\u0439\u043b\u043e\u0432. \u0412 \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0430\u0441\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0430 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043d\u0430 TCP-\u043f\u043e\u0440\u0442 8888 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0445\u043e\u0441\u0442\u0430 \u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0430 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 «\/etc\/shadow». \u041f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u043e\u0441\u043b\u0435 \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442 \u0440\u0443\u0442\u043a\u0438\u0442 \u0434\u043b\u044f \u0437\u0430\u043a\u0440\u0435\u043f\u043b\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f \u043d\u0430 \u0432\u0437\u043b\u043e\u043c\u0430\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. <\/p>\n

Teostatud eksperimendis j\u00e4i Curing rootkit'i tegevus m\u00e4rkamatuks Falco ja Tetragoni j\u00e4lgimisvahendite poolt, mida kasutatakse turvaskooriga anomaalia tuvastamiseks hostides ja konteinerites (toetatakse Kubernetesel p\u00f5hineva infrastruktuuri integreerimist). Need t\u00f6\u00f6riistad kasutavad s\u00fcsteemi kutsungite pealtkuulamist selliste s\u00fcndmuste anal\u00fc\u00fcsimiseks nagu protsesside k\u00e4ivitamine, v\u00f5rguaktiivsus ja failide t\u00f6\u00f6tlemine, kuid ei arvestanud io_uring'i alamk\u00e4sitsemise kasutamise v\u00f5imalust sarnaste operatsioonide jaoks. Suur osa Linuxile kergelt kergesti kergelt avastamis- ja reageerimiss\u00fcsteemidest turvaintsidentide puhul p\u00f5hineb samuti s\u00fcsteemi kutsungite pealtkuulamisel. <\/p>\n

Kuna v\u00e4ltida v\u00f5rgutegevuse ja failitegevuse j\u00e4lgimise vahendite ringk\u00e4iku, on soovitatav s\u00fcsteemik\u00f5nede interceptimise asemel kasutada KRSI (Kernel Runtime Security Instrumentation) mehhanismi, mis ilmus Linuxi j\u00f5udis 5.7 tuuma ja v\u00f5imaldab BPF-programme kinnitada mis tahes LSM-konksudele. N\u00e4iteks v\u00f5imaldab KRSI LSM-konksude tasemel j\u00e4lgida failitehingute, v\u00f5rgu\u00fchenduste ja protsesside k\u00e4ivitamist, s\u00f5ltumata sellest, kas need tehingud on algatatud l\u00e4bi spetsiifiliste s\u00fcsteemik\u00f5nede v\u00f5i io_uring'i kaudu. <\/p>\n

Varem oli io_uring alamv\u00f5rk kriitika objektiks regulaarsete t\u00f5siste haavatavuste t\u00f5ttu. Vastuseks kasutajate soovidele, kes soovisid saada lihtsat t\u00f6\u00f6riista io_uring'i v\u00e4ljal\u00fclitamiseks ilma tuuma \u00fcmber ehitamiseta, lisati Linuxi tuumasse versioonis 6.6 sysctl io_uring_disabled. Google on vaikimisi l\u00fclitanud io_uring'i v\u00e4lja ChromeOS-is, Androidis ja oma serverites<\/a>, selgitades, et io_uring'i turvaprobleemide kehv olukord kaalub \u00fcles io_uring'i kasutamise eelised j\u00f5udluse suurendamiseks.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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\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\udd47Linuxi rootkit'i protot\u00fc\u00fcp, mis kasutab io_uring'i s\u00fcsteemik\u00f5nede anal\u00fcsaatorite ringk\u00e4imiseks | 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