The Docker engine, up to and including version 1.3.1, was vulnerable to extracting files to arbitrary paths on the host during ‘docker pull’ and ‘docker load’ operations. This was caused by symlink and hardlink traversals present in Docker's image extraction. This vulnerability could be leveraged to perform remote code execution and privilege escalation.

Docker 1.3.2 remedies this vulnerability. Additional checks have been added to pkg/archive and image extraction is now performed in a chroot. No remediation is available for older versions of Docker and users are advised to upgrade.

Related vulnerabilities discovered by Florian Weimer of Red Hat Product Security and independent researcher, Tõnis Tiigi.