cis-docker-v170-4-10

name	cis-docker-v170-4.10
description	Ensure secrets are not stored in Dockerfiles
category	cis-docker
version	1.7.0
author	cyberstrike-official
tags	["cis","docker","images","configuration","secrets"]
cis_id	4.10
cis_benchmark	CIS Docker Benchmark v1.7.0
tech_stack	["docker"]
cwe_ids	["CWE-312"]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Docker Benchmark v1.7.0 - Control 4.10

Profile Applicability

• Level 1 - Docker - Linux

Description

Do not store any secrets in Dockerfiles.

Rationale

Docker images are not opaque and contain information about the commands used to build them. As such secrets should not be included in Dockerfiles used to build images as they will be visible to any users of the image.

Impact

A proper secrets management process will be required for Docker image building.

Audit Procedure

Run the below command to get the list of images:

docker images

Run the below command for each image in the list above, and look for any secrets:

docker history <IMAGE_ID>

Alternatively, if you have access to Dockerfile for the image, verify that there are no secrets as described above.

Remediation

Do not store any kind of secrets within Dockerfiles. Where secrets are required during the build process, make use of a secrets management tool, such as the buildkit builder included with Docker.

Default Value

By default, there are no restrictions on storing config secrets in the Dockerfiles.

References

1. https://docs.docker.com/develop/develop-images/build_enhancements/#new-docker-build-secret-information

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

Assessment Status

Manual