{"id":34748,"date":"2019-10-31T22:00:11","date_gmt":"2019-10-31T19:00:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera\/"},"modified":"2019-10-31T22:00:11","modified_gmt":"2019-10-31T19:00:11","slug":"uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","title":{"rendered":"Sebezhet\u0151s\u00e9g a Dockerben, amely lehet\u0151v\u00e9 teszi a tart\u00e1lyb\u00f3l val\u00f3 kijut\u00e1st.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Docker izol\u00e1lt Linux-kont\u00e9nerek kezel\u00e9s\u00e9re szolg\u00e1l\u00f3 eszk\u00f6zt\u00e1r\u00e1ban identified<\/a><\/noindex> vulnerability (CVE-2018-15664<\/a><\/noindex>), amely bizonyos k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt lehet\u0151v\u00e9 teszi a hozz\u00e1f\u00e9r\u00e9st a gazda k\u00f6rnyezethez a kont\u00e9nerb\u0151l, ha van lehet\u0151s\u00e9g saj\u00e1t k\u00e9pek futtat\u00e1s\u00e1ra a rendszerben, vagy ha hozz\u00e1f\u00e9r\u00e9s van a fut\u00f3 kont\u00e9nerhez. A probl\u00e9ma minden Docker verzi\u00f3ban megjelenik, \u00e9s m\u00e9g nem jav\u00edtott\u00e1k (javasolt, de m\u00e9g nem elfogadott, k\u00f3dra ford\u00edt.<\/a><\/noindex>, amely felf\u00fcggeszti a kont\u00e9ner munk\u00e1j\u00e1t a f\u00e1jlrendszerrel v\u00e9gzett m\u0171veletek idej\u00e9re).<\/p>\n

A sebez\u0151s\u00e9g lehet\u0151v\u00e9 teszi, hogy f\u00e1jlokat mentsenek el a tart\u00e1lyb\u00f3l a gazdaszerver f\u00e1jlrendszer\u00e9nek tetsz\u0151leges r\u00e9sz\u00e9re a \u201edocker cp\u201d parancs v\u00e9grehajt\u00e1sakor. A f\u00e1jlok kinyer\u00e9se root jogokkal t\u00f6rt\u00e9nik, ami lehet\u0151s\u00e9get ad b\u00e1rmely f\u00e1jl olvas\u00e1s\u00e1ra vagy \u00edr\u00e1s\u00e1ra a gazdaszerver k\u00f6rnyezet\u00e9ben, ami elegend\u0151 ahhoz, hogy a gazdaszerver felett ellen\u0151rz\u00e9st nyerjen (p\u00e9ld\u00e1ul fel\u00fcl\u00edrhatja a \/etc\/shadow f\u00e1jlt). <\/p>\n

A t\u00e1mad\u00e1s akkor hajthat\u00f3 v\u00e9gre, amikor az adminisztr\u00e1tor a \u201edocker cp\u201d parancsot futtatja f\u00e1jlok m\u00e1sol\u00e1s\u00e1ra a tart\u00e1lyba vagy onnan. \u00cdgy a t\u00e1mad\u00f3nak valamilyen m\u00f3don meg kell gy\u0151znie a Docker adminisztr\u00e1tort az oper\u00e1ci\u00f3 elv\u00e9gz\u00e9s\u00e9nek sz\u00fcks\u00e9gess\u00e9g\u00e9r\u0151l, \u00e9s el\u0151re kell l\u00e1tnia a m\u00e1sol\u00e1s sor\u00e1n haszn\u00e1lt utat. M\u00e1sr\u00e9szt a t\u00e1mad\u00e1s akkor is megval\u00f3s\u00edthat\u00f3, p\u00e9ld\u00e1ul, ha a felh\u0151szolg\u00e1ltat\u00e1sok lehet\u0151s\u00e9get biztos\u00edtanak a konfigur\u00e1ci\u00f3s f\u00e1jlok m\u00e1sol\u00e1s\u00e1ra a tart\u00e1lyba, amelyeket a \u201edocker cp\u201d parancs haszn\u00e1lat\u00e1val kell v\u00e9grehajtani.<\/p>\n

A probl\u00e9ma a FollowSymlinkInScope<\/a><\/noindex>, amely kisz\u00e1m\u00edtja az abszol\u00fat utat az alap f\u00e1jlrendszerben a tart\u00e1ly elhelyezked\u00e9s\u00e9t figyelembe vev\u0151 relat\u00edv \u00fatvonal alapj\u00e1n. A \u201edocker cp\u201d parancs v\u00e9grehajt\u00e1sa sor\u00e1n r\u00f6vid ideig verseng\u0151 \u00e1llapot<\/a><\/noindex>, amely sor\u00e1n az \u00fatvonal m\u00e1r ellen\u0151rizve lett, de a m\u0171velet m\u00e9g nem hajt\u00f3dott v\u00e9gre. Mivel a m\u00e1sol\u00e1s a gazdarendszer f\u0151 f\u00e1jlrendszer\u00e9nek kontextus\u00e1ban t\u00f6rt\u00e9nik, ebben az id\u0151szakban lehets\u00e9ges kicser\u00e9lni egy hivatkoz\u00e1st egy m\u00e1sik \u00fatra, \u00e9s elind\u00edtani az adatok m\u00e1sol\u00e1s\u00e1t a kont\u00e9neren k\u00edv\u00fcli f\u00e1jlrendszer tetsz\u0151leges hely\u00e9re.<\/p>\n

Mivel a verseng\u0151 \u00e1llapot megnyilv\u00e1nul\u00e1s\u00e1nak ideiglenes ablaka er\u0151sen korl\u00e1tozott egy k\u00e9sz\u00edtett exploiter protot\u00edpusban<\/a><\/noindex> a tart\u00e1lyb\u00f3l t\u00f6rt\u00e9n\u0151 m\u00e1sol\u00e1s ellen\u0151rz\u00e9se sor\u00e1n siker\u00fclt sikeres t\u00e1mad\u00e1st v\u00e9grehajtani kevesebb mint 1% esetben a m\u00e1sol\u00e1s sor\u00e1n haszn\u00e1lt \u00fatvonal szimbolikus hivatkoz\u00e1s\u00e1nak ciklikus fel\u00fcl\u00edr\u00e1s\u00e1val (sikeres t\u00e1mad\u00e1st hajtottak v\u00e9gre k\u00f6r\u00fclbel\u00fcl 10 m\u00e1sodperc folyamatos k\u00eds\u00e9rlet ut\u00e1n a f\u00e1jl \u201edocker cp\u201d paranccsal val\u00f3 m\u00e1sol\u00e1s\u00e1ra).<\/p>\n

A tart\u00e1lyba t\u00f6rt\u00e9n\u0151 m\u00e1sol\u00e1si m\u0171velet sor\u00e1n \u00fajrahasznos\u00edthat\u00f3 t\u00e1mad\u00e1st lehet el\u00e9rni a gazdaszerver f\u00e1jlj\u00e1nak fel\u00fcl\u00edr\u00e1s\u00e1ra csup\u00e1n n\u00e9h\u00e1ny iter\u00e1ci\u00f3n bel\u00fcl. A t\u00e1mad\u00e1s lehet\u0151s\u00e9ge abban rejlik, hogy a tart\u00e1lyba t\u00f6rt\u00e9n\u0151 m\u00e1sol\u00e1skor a \u201echrootarchive\u201d koncepci\u00f3t alkalmazz\u00e1k, amely szerint az archive.go folyamat nem a tart\u00e1ly chroot gy\u00f6ker\u00e9be, hanem a c\u00e9l\u00fatvonal sz\u00fcl\u0151 k\u00f6nyvt\u00e1r\u00e1nak chroot-j\u00e1ba bontja ki az arch\u00edvumot, amelyet a t\u00e1mad\u00f3 ir\u00e1ny\u00edt, \u00e9s nem \u00e1ll\u00edtja le a tart\u00e1ly v\u00e9grehajt\u00e1s\u00e1t (a chroot a versenyhelyzet kihaszn\u00e1l\u00e1s\u00e1nak jelz\u0151je).<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u043f\u043e\u043a\u0430 \u043d\u0435 \u043f\u0440\u0438\u043d\u044f\u0442, \u043f\u0430\u0442\u0447, \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u044e\u0449\u0438\u0439 \u043f\u0440\u0438\u043e\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0440\u0430\u0431\u043e\u0442\u044b \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 […]<\/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-34748","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\u00e9g a Dockerben, amely lehet\u0151v\u00e9 teszi a 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