{"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\/da\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","title":{"rendered":"S\u00e5rbarhed i Docker, der g\u00f8r det muligt at slippe ud af containeren","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I v\u00e6rkt\u00f8jet til at administrere isolerede Linux-containere Docker opdaget<\/a><\/noindex> s\u00e5rbarhed (CVE-2018-15664<\/a><\/noindex>), som under bestemte omst\u00e6ndigheder giver adgang til v\u00e6rtsmilj\u00f8et fra containeren, hvis der er mulighed for at k\u00f8re egne billeder i systemet eller ved adgang til den k\u00f8rende container. Problemet opst\u00e5r i alle versioner af Docker og forbliver uafhjulpet (forsl\u00e5et, men endnu ikke accepteret, patch<\/a><\/noindex>, som implementerer suspendering af containerens drift i l\u00f8bet af operationer med FS).<\/p>\n

S\u00e5rbarheden muligg\u00f8r udtr\u00e6kning af filer fra containeren til en vilk\u00e5rlig del af v\u00e6rtsystemets filsystem ved udf\u00f8relse af kommandoen «docker cp». Udtr\u00e6kning af filer udf\u00f8res med root-rettigheder, hvilket giver mulighed for at l\u00e6se eller skrive enhver fil i v\u00e6rtsmilj\u00f8et, hvilket er tilstr\u00e6kkeligt til at opn\u00e5 kontrol over v\u00e6rtsystemet (for eksempel kan man overskrive \/etc\/shadow). <\/p>\n

Angrebet kan kun udf\u00f8res i det \u00f8jeblik, hvor administratoren udf\u00f8rer kommandoen «docker cp» for at kopiere filer til eller fra containeren. S\u00e5ledes skal angriberen p\u00e5 en eller anden m\u00e5de overbevise Docker-administratoren om n\u00f8dvendigheden af at udf\u00f8re denne handling og forudse den anvendte sti under kopieringen. P\u00e5 den anden side kan angrebet f.eks. finde sted, n\u00e5r cloud-tjenester tilbyder midler til at kopiere konfigurationsfiler til containeren, der er bygget med brug af kommandoen «docker cp».<\/p>\n

Problemet skyldes en mangel i anvendelsen af funktionen FollowSymlinkInScope<\/a><\/noindex>, der beregner den absolutte sti i hovedfilsystemet baseret p\u00e5 den relative sti, der tager h\u00f8jde for containerens placering. Under udf\u00f8relsen af kommandoen «docker cp» opst\u00e5r der kortvarig race condition<\/a><\/noindex>, hvor stien allerede er kontrolleret, men operationen endnu ikke er udf\u00f8rt. Da kopiering udf\u00f8res i konteksten af hoved-FS i v\u00e6rts-systemet, kan man i det angivne tidsrum n\u00e5 at \u00e6ndre linket til en anden sti og initiere kopiering af data til vilk\u00e5rlig plads i filsystemet uden for containeren.<\/p>\n

Da tidsvinduet for manifestation af race condition er meget begr\u00e6nset i den forberedte prototype af exploiten<\/a><\/noindex> under udf\u00f8relsen af kopieringsoperationer fra containeren lykkedes det at gennemf\u00f8re et succesfuldt angreb i mindre end 1% af tilf\u00e6ldene ved cyklisk at \u00e6ndre symbolsk link i stien, der anvendes i kopieringsoperationen (et succesfuldt angreb blev gennemf\u00f8rt efter cirka 10 sekunders fors\u00f8g kontinuerligt i cyklus for at kopiere en fil med kommandoen «docker cp»).<\/p>\n

Ved udf\u00f8relsen af kopieringsoperationen til containeren kan man opn\u00e5 et gentageligt angreb ved at overskrive en fil i v\u00e6rtsystemet efter blot nogle f\u00e5 iterationer. Muligheden for angrebet er relateret til det faktum, at der ved kopiering til containeren anvendes begrebet «chrootarchive», if\u00f8lge hvilket processen archive.go udtr\u00e6kker arkivet ikke i chroot-roden af containeren, men i chroot-for\u00e6lderens katalog til den m\u00e5lretning, der er under kontrol af angriberen og ikke stopper containerens udf\u00f8relse i denne proces (chroot bruges som et tegn for at udnytte en race condition).<\/p>\n

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

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

\u0412 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 \u0434\u043b\u044f \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c\u0438 Linux-\u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430\u043c\u0438 Docker \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2018-15664), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c \u0441\u0442\u0435\u0447\u0435\u043d\u0438\u0438 \u043e\u0431\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u0441\u0442\u0432 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044e \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0441\u0432\u043e\u0438\u0445 \u043e\u0431\u0440\u0430\u0437\u043e\u0432 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u043b\u0438 \u043f\u0440\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u043c\u0443 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u043e \u0432\u0441\u0435\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 Docker \u0438 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 (\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d, \u043d\u043e \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\udd47Vulnerability in Docker that allows escaping from the container | ProHoster","description":"A vulnerability was identified in the toolkit for managing isolated Linux containers Docker (","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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 \u0432 Docker, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 | ProHoster","og:description":"\u0412 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 \u0434\u043b\u044f \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c\u0438 Linux-\u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430\u043c\u0438 Docker \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","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":"2019-10-31T19:00:11+00:00","article:modified_time":"2019-10-31T19:00:11+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"34748","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-01-21 20:28:56","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-03-01 02:15:38","updated":"2026-01-21 20:28:56","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/34748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=34748"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/34748\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=34748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=34748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=34748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}