cyberstrikeus 5.6 Ensure sensitive host system directories are not mounted on containers (Manual)
Profile Applicability
- Level 1 - Docker - Linux
Description
You should not allow sensitive host system directories such as those listed below to be mounted as container volumes, especially in read-write mode.
/
/boot
/dev
/etc
/lib
/lib64
/proc
/sys
/usr
Rationale
If sensitive directories are mounted in read-write mode, it could be possible to make changes to files within them. This has obvious security implications and should be avoided.
Impact
None.
Audit Procedure
You should run the following command:
docker ps --quiet --all | xargs docker inspect --format='{{ .Id }}: Volumes={{ .Mounts }}'
This command returns a list of currently mapped directories and indicates whether they are mounted in read-write mode for each container instance.
Remediation
You should not mount directories which are security sensitive on the host within containers, especially in read-write mode.
Default Value
Docker defaults to using a read-write volume but you can also mount a directory read-only. By default, no sensitive host directories are mounted within containers.
References
CIS Controls
v8
3 Data Protection
Develop processes and technical controls to identify, classify, securely handle, retain, and dispose of data.
v7
13 Data Protection
Data Protection