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Docker Engine Privilege Escalation

Docker Engine Privilege Escalation
Posted Jan 10, 2017
Authored by Tonis Tiigi, Aleksa Sarai

Docker Engine versions prior to 1.12.6 suffer from an insecure open of a file descriptor.

tags | advisory
advisories | CVE-2016-9962
SHA-256 | c6dd4934c055006df86b6145b7e548b07287014ac26ce1af46e0b6fa783d1157

Docker Engine Privilege Escalation

Change Mirror Download
Docker Engine version 1.12.6 has been released to address a vulnerability
and is immediately available for all supported platforms. Users are advised
to upgrade existing installations of the Docker Engine and use 1.12.6 for
new installations.

Please send any questions to security@docker.com.


==============================================================
[CVE-2016-9962] Insecure opening of file-descriptor allows privilege
escalation

==============================================================

RunC allowed additional container processes via `runc exec` to be ptraced
by the pid 1 of the container. This allows the main processes of the
container, if running as root, to gain access to file-descriptors of these
new processes during the initialization and can lead to container escapes
or modification of runC state before the process is fully placed inside the
container


Credit for this discovery goes to Aleksa Sarai from SUSE and TAunis Tiigi
from Docker.


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