{"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\/pl\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","title":{"rendered":"Vulnerabilno\u015b\u0107 w Dockerze, kt\u00f3ra pozwala na wydostanie si\u0119 z kontenera","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W narz\u0119dziu do zarz\u0105dzania izolowanymi kontenerami Linux Docker wykryto<\/a><\/noindex> vulnerabilno\u015b\u0107 (CVE-2018-15664<\/a><\/noindex>), kt\u00f3ra w okre\u015blonych okoliczno\u015bciach umo\u017cliwia dost\u0119p do \u015brodowiska hosta z kontenera, je\u015bli mo\u017cna uruchomi\u0107 w\u0142asne obrazy w systemie lub posiada si\u0119 dost\u0119p do dzia\u0142aj\u0105cego kontenera. Problem wyst\u0119puje we wszystkich wersjach Dockera i pozostaje nierozwi\u0105zany (zaproponowane, ale jeszcze nie przyj\u0119te, \u0142atk\u0119<\/a><\/noindex>, implementuj\u0105ce wstrzymywanie dzia\u0142ania kontenera w czasie wykonywania operacji na systemie plik\u00f3w).<\/p>\n

Vulnerability allows extracting files from the container to any part of the host system's file system when executing the command «docker cp». File extraction is performed with root privileges, enabling the reading or writing of any files in the host environment, which is sufficient for gaining control over the host system (for example, it is possible to overwrite \/etc\/shadow). <\/p>\n

The attack can only be executed at the moment the administrator performs the command «docker cp» to copy files into or out of the container. Thus, the attacker must somehow convince the Docker administrator of the necessity to execute this operation and anticipate the path used for copying. On the other hand, the attack can be carried out, for example, when cloud services provide tools for copying configuration files into the container built using the «docker cp» command.<\/p>\n

Problem jest spowodowany niedopracowaniem w zastosowaniu funkcji FollowSymlinkInScope<\/a><\/noindex>, calculating the absolute path in the main file system based on the relative path that takes into account the container's placement. During the execution of the «docker cp» command, a brief occurrence arises wy\u015bcig stan\u00f3w<\/a><\/noindex>, w kt\u00f3rym \u015bcie\u017cka zosta\u0142a ju\u017c zweryfikowana, ale operacja jeszcze nie zosta\u0142a wykonana. Poniewa\u017c kopiowanie odbywa si\u0119 w kontek\u015bcie g\u0142\u00f3wnego systemu plik\u00f3w hosta, w podanym czasie mo\u017cna zd\u0105\u017cy\u0107 podmieni\u0107 link na inn\u0105 \u015bcie\u017ck\u0119 i zainicjowa\u0107 kopiowanie danych do dowolnego miejsca w systemie plik\u00f3w poza kontenerem.<\/p>\n

Poniewa\u017c czasowe okno wyst\u0105pienia wy\u015bcigu stan\u00f3w jest silnie ograniczone w przygotowanym prototypie exploit\u00f3w<\/a><\/noindex> when performing copy operations from the container, a successful attack was achieved in less than 1% of cases with a cyclic substitution of the symbolic link in the path used in the copy operation (a successful attack was carried out after approximately 10 seconds of attempts to continuously copy a file using the «docker cp» command).<\/p>\n

When performing the copy operation into the container, a repeatable attack can be achieved by overwriting a file in the host system in just a few iterations. The attack opportunity is related to the fact that when copying into the container, the «chrootarchive» concept is applied, according to which the archive.go process extracts the archive not in the chroot root of the container but in the chroot of the parent directory of the target path, controlled by the attacker, and does not stop the container during this (chroot is used as an indicator to exploit a race condition).<\/p>\n

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

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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