{"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\/en\/blog\/news\/uyazvimost-v-docker-pozvolyayushhaya-vybratsya-iz-kontejnera","title":{"rendered":"A vulnerability in Docker allows escape from the container.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In the toolkit for managing isolated Linux containers with Docker identified<\/a><\/noindex> vulnerability (CVE-2018-15664<\/a><\/noindex>), which under certain circumstances allows access to the host environment from the container when there is an opportunity to run one's own images on the system or access to the running container. The issue appears in all versions of Docker and remains unfixed (proposed but not yet accepted, patch<\/a><\/noindex>, implementing the suspension of container operations while performing file system operations).<\/p>\n

The vulnerability allows files to be extracted from the container to any part of the host system's filesystem when the command 'docker cp' is executed. Files are extracted 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, \/etc\/shadow can be overwritten). <\/p>\n

An attack can only be carried out at the moment an administrator executes the 'docker cp' command to copy files into or from the container. Thus, the attacker must somehow convince the Docker administrator of the necessity to perform this operation and predict the path used for copying. On the other hand, an attack can be executed, for instance, when cloud services provide means to copy configuration files into the container using the 'docker cp' command.<\/p>\n

The issue is caused by a flaw in the application of the function FollowSymlinkInScope<\/a><\/noindex>, calculating the absolute path in the main filesystem based on the relative path considering the container's location. During the execution of the 'docker cp' command, a temporary race condition<\/a><\/noindex>occurs, during which the path has already been verified, but the operation has not yet been executed. Since the copying occurs in the context of the host system's main file system, within that time frame, it is possible to replace the link with another path and initiate data copying to an arbitrary location in the file system outside the container.<\/p>\n

As the time window for the manifestation of the race condition is very limited in the prepared exploit prototype<\/a><\/noindex> successful attacks were achieved in less than 1% of cases when cyclically replacing the symbolic link in the path used in the copy operation (a successful attack was executed after approximately 10 seconds of continuous attempts to copy a file using the 'docker cp' command).<\/p>\n

During 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 possibility of the attack 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 into the chroot root of the container, but into the chroot of the parent directory of the target path, controlled by the attacker, and does not stop the execution of the container (chroot is used as an indicator for exploiting the race condition).<\/p>\n

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

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

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