{"id":109263,"date":"2023-07-05T21:10:21","date_gmt":"2023-07-05T19:10:24","guid":{"rendered":"https:\/\/prohoster.info\/?p=109263"},"modified":"2023-07-06T09:41:50","modified_gmt":"2023-07-06T07:41:50","slug":"uyazvimost-konfiguraczij-nginx-s-nekorrektnymi-nastrojkami-bloka-alias","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-konfiguraczij-nginx-s-nekorrektnymi-nastrojkami-bloka-alias","title":{"rendered":"Az Nginx konfigur\u00e1ci\u00f3k sebezhet\u0151s\u00e9ge, helytelen alias blokkbe\u00e1ll\u00edt\u00e1sokkal","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

N\u00e9h\u00e1ny nginx-szerver tov\u00e1bbra is sebezhet\u0151 az Nginx Alias Traversal technik\u00e1val, amelyet a Blackhat konferenci\u00e1n javasoltak 2018-ban, \u00e9s lehet\u0151v\u00e9 teszi a f\u00e1jlokhoz \u00e9s a k\u00f6nyvt\u00e1rakhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st, amelyek a konfigur\u00e1ci\u00f3s direkt\u00edva \"alias\" \u00e1ltal megadott gy\u00f6k\u00e9rk\u00f6nyvt\u00e1ron k\u00edv\u00fcl tal\u00e1lhat\u00f3k. A probl\u00e9ma csak az olyan konfigur\u00e1ci\u00f3kban jelentkezik, ahol az \"alias\" direkt\u00edva a \"location\" blokkban van, \u00e9s a param\u00e9tere nem a '\/' karakterrel z\u00e1rul, m\u00edg az \"alias\" '\/'-val z\u00e1rul.

\"Az<\/center> <\/p>\n

A probl\u00e9ma l\u00e9nyege, hogy az alias direkt\u00edv\u00e1val ell\u00e1tott blokkok f\u00e1jljait a k\u00e9rt \u00fatvonal csatol\u00e1s\u00e1val szolg\u00e1lj\u00e1k ki, miut\u00e1n az nyel\u0151dik a location direkt\u00edv\u00e1val megadott mint\u00e1val, \u00e9s lev\u00e1gj\u00e1k az adott mint\u00e1ban megadott \u00fatvonal r\u00e9sz\u00e9t. A fent bemutatott sebezhet\u0151 konfigur\u00e1ci\u00f3s p\u00e9ld\u00e1ban a t\u00e1mad\u00f3 k\u00e9rheti a \"\\\/img..\\\/test.txt\" f\u00e1jt, \u00e9s ez a k\u00e9r\u00e9s megfelel a location mint\u00e1nak, amely \"\\\/img\"; ezt k\u00f6vet\u0151en a fennmarad\u00f3 r\u00e9sz, a \"..\\\/test.txt\" az alias direkt\u00edv\u00e1n\u00e1l megadott \"\\\/var\\\/images\\\/\" \u00fatvonalhoz lesz csatolva, \u00edgy v\u00e9g\u00fcl a \"\\\/var\\\/images\\\/..\\\/test.txt\" f\u00e1jlra ir\u00e1nyul a k\u00e9relem. \u00cdgy a t\u00e1mad\u00f3k hozz\u00e1f\u00e9rhetnek b\u00e1rmely f\u00e1jlhoz a \"\\\/var\" k\u00f6nyvt\u00e1rban, nem csak a \"\\\/var\\\/images\\\/\"-ban l\u00e9v\u0151 f\u00e1jlokhoz; p\u00e9ld\u00e1ul az nginx napl\u00f3f\u00e1jljainak let\u00f6lt\u00e9s\u00e9hez elegend\u0151 a \"\\\/img..\\\/log\\\/nginx\\\/access.log\" k\u00e9r\u00e9s k\u00fcld\u00e9se. <\/p>\n

Azokban a konfigur\u00e1ci\u00f3kban, ahol az alias direkt\u00edva \u00e9rt\u00e9ke nem '\/' karakterrel z\u00e1rul (p\u00e9ld\u00e1ul \"alias \\\/var\\\/images;\"), a t\u00e1mad\u00f3 nem tud a sz\u00fcl\u0151 k\u00f6nyvt\u00e1rba l\u00e9pni, de lehet\u0151s\u00e9ge van egy m\u00e1sik k\u00f6nyvt\u00e1r k\u00e9r\u00e9s\u00e9re a \\\/var-ban, amelynek neve megegyezik a konfigur\u00e1ci\u00f3ban megadottal. P\u00e9ld\u00e1ul a \"\\\/img.old\\\/test.txt\" k\u00e9r\u00e9s elk\u00fcld\u00e9s\u00e9vel hozz\u00e1f\u00e9rhet a \"var\\\/images.old\\\/test.txt\" k\u00f6nyvt\u00e1rhoz. <\/p>\n

A GitHub-on v\u00e9gzett repositoryelemz\u00e9s azt mutatta, hogy a probl\u00e9m\u00e1hoz vezet\u0151 hib\u00e1k az nginx be\u00e1ll\u00edt\u00e1saiban tov\u00e1bbra is el\u0151fordulnak val\u00f3s projektekn\u00e9l. P\u00e9ld\u00e1ul a probl\u00e9ma az Bitwarden jelsz\u00f3kezel\u0151 szerveroldal\u00e1n el\u0151ker\u00fclt, \u00e9s felhaszn\u00e1lhat\u00f3 volt az \u00f6sszes f\u00e1jl el\u00e9r\u00e9s\u00e9re a \\\/etc\\\/bitwarden k\u00f6nyvt\u00e1rban (a k\u00e9rd\u00e9sek \\\/attachments-b\u00f3l sz\u00e1rmaztak a \\\/etc\\\/bitwarden\\\/attachments\\\/b\u00f3l), bele\u00e9rtve a nem titkos\u00edtott jelsz\u00f3t\u00e1rol\u00f3t a \"vault.db\"-ben, a tan\u00fas\u00edtv\u00e1nyt \u00e9s az napl\u00f3kat, amelyeket elegend\u0151 volt a k\u00f6vetkez\u0151 k\u00e9r\u00e9sek k\u00fcld\u00e9s\u00e9vel el\u00e9rni: \"\\\/attachments..\\\/vault.db\", \"\\\/attachments..\\\/identity.pfx\", \"\\\/attachments..\\\/logs\\\/api.log\" stb.

\"Az<\/center>
\"Az<\/center> <\/p>\n

A m\u00f3dszer a Google HPC Toolkit eset\u00e9ben is m\u0171k\u00f6d\u00f6tt, ahol a k\u00e9r\u00e9sek a «..\\\/hpc-toolkit\\\/community\\\/front-end\\\/website\\\/static\\\/» k\u00f6nyvt\u00e1rba ir\u00e1nyultak. A t\u00e1mad\u00f3 a z\u00e1rt kulccsal \u00e9s hiteles\u00edt\u0151 adatokkal rendelkez\u0151 adatb\u00e1zis megszerz\u00e9s\u00e9hez «\\\/static..\\\/\\.secret_key» \u00e9s «\\\/static..\\\/db.sqlite3» lek\u00e9rdez\u00e9seket k\u00fcldhetett.

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

\u041d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u044b \u0441 nginx \u043e\u0441\u0442\u0430\u044e\u0442\u0441\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u044b \u0434\u043b\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0438 Nginx Alias Traversal, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u044b\u043b\u0430 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0430 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 Blackhat \u0435\u0449\u0451 \u0432 2018 \u0433\u043e\u0434\u0443 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0430\u043c \u0438 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430\u043c, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u044b\u043c \u0432\u043d\u0435 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u0433\u043e \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430, \u0437\u0430\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0432 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u0435 «alias». \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 \u0441 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432\u043e\u0439 «alias», \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u043e\u0439 \u0432\u043d\u0443\u0442\u0440\u0438 \u0431\u043b\u043e\u043a\u0430 «location», \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043d\u0435 \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u0441\u0438\u043c\u0432\u043e\u043b […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":109264,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-109263","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Az Nginx alias blokk hib\u00e1s be\u00e1ll\u00edt\u00e1saival kapcsolatos sebezhet\u0151s\u00e9g | ProHoster","description":"N\u00e9h\u00e1ny nginx szerver tov\u00e1bbra is sebezhet\u0151 az Nginx Alias Traversal technik\u00e1ra, amelyet a Blackhat konferenci\u00e1n 2018-ban mutattak be, \u00e9s lehet\u0151v\u00e9 teszi, hogy f\u00e1jlokhoz \u00e9s k\u00f6nyvt\u00e1rakhoz f\u00e9rj\u00fcnk hozz\u00e1 a k\u00f6nyvt\u00e1rakon k\u00edv\u00fcl.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-konfiguraczij-nginx-s-nekorrektnymi-nastrojkami-bloka-alias","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0439 Nginx \u0441 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u044b\u043c\u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u043c\u0438 \u0431\u043b\u043e\u043a\u0430 alias | ProHoster","og:description":"\u041d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u044b \u0441 nginx \u043e\u0441\u0442\u0430\u044e\u0442\u0441\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u044b \u0434\u043b\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0438 Nginx Alias Traversal, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u044b\u043b\u0430 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0430 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 Blackhat \u0435\u0449\u0451 \u0432 2018 \u0433\u043e\u0434\u0443 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0444\u0430\u0439\u043b\u0430\u043c \u0438 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430\u043c, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u044b\u043c \u0432\u043d\u0435.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-konfiguraczij-nginx-s-nekorrektnymi-nastrojkami-bloka-alias","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-07-05T19:10:24+00:00","article:modified_time":"2023-07-06T07:41:50+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/109263","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=109263"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/109263\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media\/109264"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=109263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=109263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=109263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}