CVE-2015-3629

Libcontainer 1.6.0, as used in Docker Engine, allows local users to escape containerization (mount namespace breakout) and write to arbitrary file on the host system via a symlink attack in an image when respawning a container.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name	Vendor	Start Version	End Version
Libcontainer	Docker	1.6.0 (including)	1.6.0 (including)
Red Hat Enterprise Linux 7 Extras	RedHat	docker-0:1.6.2-14.el7	*
Docker.io	Ubuntu	esm-infra/xenial	*
Docker.io	Ubuntu	trusty	*
Docker.io	Ubuntu	upstream	*
Docker.io	Ubuntu	utopic	*
Docker.io	Ubuntu	vivid	*
Docker.io	Ubuntu	wily	*
Docker.io	Ubuntu	xenial	*
Docker.io	Ubuntu	yakkety	*

Potential Mitigations

Follow the principle of least privilege when assigning access rights to entities in a software system.
Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2015-3629
CWE	https://cwe.mitre.org/data/definitions/59.html

Improper Link Resolution Before File Access ('Link Following')

Weakness

Affected Software

Potential Mitigations

References

CVE-2015-3629

Improper Link Resolution Before File Access ('Link Following')

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References