Details

Verify that all the registry certificate files (usually found under /etc/docker/certs.d/ directory) have permissions of 444 or more restrictive.

Rationale:

/etc/docker/certs.d/ directory contains Docker registry certificates. These certificate files must have permissions of 444 to maintain the integrity of the certificates.

Solution

chmod 444 /etc/docker/certs.d//*
This would set the permissions for registry certificate files to 444.
Impact:
None.
Default Value:
By default, the permissions for registry certificate files might not be 444. The default file permissions are governed by the system or user specific umaskvalues.

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/1726

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.

References

• 800-53|CM-6b.
• CSCv6|14.4

Source

• Tenable.com/audits