{"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\/sv\/blog\/news\/prototip-rutkita-dlya-linux-ispolzuyushhij-io_uring-dlya-obhoda-analizatorov-sistemnyh-vyzovov","title":{"rendered":"Prototyp av en rootkit f\u00f6r Linux som anv\u00e4nder io_uring f\u00f6r att kringg\u00e5 systemanropsanalysatorer","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Forskare fr\u00e5n f\u00f6retaget ARMO har demonstrerat m\u00f6jligheten att skapa rootkits som inte anv\u00e4nder specifika systemanrop f\u00f6r att utf\u00f6ra typiska operationer, som att l\u00e4sa\/skriva filer och ta emot kommandon fr\u00e5n en extern server. Ist\u00e4llet f\u00f6r systemanrop f\u00f6r att utf\u00f6ra n\u00e4tverks- och filoperationer f\u00f6resl\u00e5s det att anv\u00e4nda gr\u00e4nssnittet f\u00f6r asynkron in-\/utdata io_uring, som har st\u00f6ds sedan Linux-k\u00e4rnan 5.1. <\/p>\n

Metodens k\u00e4rna \u00e4r att man ist\u00e4llet f\u00f6r separata systemanrop f\u00f6r att f\u00e5 tillg\u00e5ng till filer och genomf\u00f6ra n\u00e4tverksoperationer (read\/write, recv\/send\/connect\/bind\/listen) kan anv\u00e4nda gemensamma systemanrop io_uring (io_uring_enter, io_uring_setup, io_uring_register etc.), som inte analyseras av typiska verktyg f\u00f6r att uppt\u00e4cka skadlig aktivitet. Gr\u00e4nssnittet io_uring st\u00f6der cirka 60 olika operationer. Det utvecklas en funktion som till\u00e5ter att starta nya processer via io_uring. <\/p>\n

F\u00f6r att demonstrera metodens funktion har ett prototyp av rootkit kallat Curing tagits fram, som utf\u00f6r handlingar s\u00e5som att ta emot kommandon fr\u00e5n externa servern<\/a> och \u00f6verf\u00f6ring\/\u00e4ndring av filer. I demonstrationen anv\u00e4ndes en beg\u00e4ran till TCP-port 8888 p\u00e5 en extern v\u00e4rd och \u00f6verf\u00f6ring av inneh\u00e5llet fr\u00e5n filen \u00ab\/etc\/shadow\u00bb. Det antas att efter en framg\u00e5ngsrik kompromettering av systemet och uppn\u00e5dd root-\u00e5tkomst, installerar angriparen en rootkit f\u00f6r att bef\u00e4sta sin n\u00e4rvaro p\u00e5 det hackade systemet. <\/p>\n

I det genomf\u00f6rda experimentet var aktiviteten av rootkiten Curing osynlig f\u00f6r \u00f6vervakningsverktygen Falco och Tetragon, som anv\u00e4nds f\u00f6r att identifiera s\u00e4kerhetsrelaterade anomalier p\u00e5 v\u00e4rdar och i containrar (st\u00f6d f\u00f6r integration med Kubernetes-baserad infrastruktur). De n\u00e4mnda verktygen anv\u00e4nder avlyssning av systemanrop f\u00f6r att analysera h\u00e4ndelser som processstart, n\u00e4tverksaktivitet och filhantering, men tar inte h\u00e4nsyn till m\u00f6jligheten att anv\u00e4nda io_uring-subsystemet f\u00f6r s\u00e5dana operationer. St\u00f6rsta delen av de kommersiella s\u00e4kerhetssystem som finns f\u00f6r Linux f\u00f6r att uppt\u00e4cka och svara p\u00e5 s\u00e4kerhetsincidenter bygger ocks\u00e5 p\u00e5 avlyssning av systemanrop. <\/p>\n

F\u00f6r att f\u00f6rhindra att verktyg f\u00f6r att sp\u00e5ra n\u00e4tverks- och filaktiviteter kringg\u00e5r systemanrop rekommenderas det att anv\u00e4nda mekanismen KRSI (Kernel Runtime Security Instrumentation), som introducerades i Linux-k\u00e4rnan 5.7 och g\u00f6r det m\u00f6jligt att f\u00e4sta BPF-program till alla LSM-hakar. Till exempel m\u00f6jligg\u00f6r KRSI p\u00e5 LSM-hakniv\u00e5 sp\u00e5rning av filoperationer, n\u00e4tverks\u00e5tkomst och processstarter, oavsett om dessa operationer initieras genom specifika systemanrop eller genom io_uring. <\/p>\n

Tidigare har io_uring-subsystemet varit f\u00f6rem\u00e5l f\u00f6r kritik p\u00e5 grund av regelbundet \u00e5terkommande allvarliga s\u00e5rbarheter. Som svar p\u00e5 anv\u00e4ndarnas \u00f6nskem\u00e5l om ett enkelt verktyg f\u00f6r att st\u00e4nga av io_uring utan att beh\u00f6va bygga om k\u00e4rnan, har sysctl io_uring_disabled lagts till i Linux-k\u00e4rnan 6.6. Google har som standard inaktiverat io_uring i ChromeOS, Android och p\u00e5 sina servrar<\/a>, och f\u00f6rklarade att den bedr\u00f6vliga s\u00e4kerhetssituationen med io_uring v\u00e4ger tyngre \u00e4n f\u00f6rdelarna med att anv\u00e4nda io_uring f\u00f6r att f\u00f6rb\u00e4ttra prestanda.
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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