[Snyk] Security upgrade alpine from 3.7 to 3.21.5

[Dustin4444]

Snyk has created this PR to fix 1 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• libnetwork/cmd/ssd/Dockerfile

We recommend upgrading to alpine:3.21.5, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	241
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	241

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[gemini-code-assist]

Summary of Changes

Hello @Dustin4444, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the security of the project by updating a critical Docker base image. It moves the libnetwork/cmd/ssd/Dockerfile from an outdated and vulnerable Alpine Linux version to a much newer, more secure release. This proactive measure aims to mitigate known security risks and improve the overall integrity of the containerized application.

Highlights

• Security Upgrade: This pull request, automatically generated by Snyk, upgrades the alpine base image in libnetwork/cmd/ssd/Dockerfile from version 3.7 to 3.21.5.
• Vulnerability Fix: The upgrade addresses a critical 'Out-of-bounds Write' vulnerability (SNYK-ALPINE37-MUSL-458286) present in the older alpine:3.7 image.
• Improved Security Posture: The target image, alpine:3.21.5, has 0 known vulnerabilities, significantly enhancing the security of the Docker build.

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[gemini-code-assist]

Code Review

This pull request, automatically generated by Snyk, aims to improve security by upgrading the Alpine base image from 3.7 to 3.21.5. While this is a valuable security update, the proposed version of Alpine Linux no longer supports Python 2, which is a dependency for this Docker image. This will cause the build to fail. I've left a critical comment with a suggestion for an intermediate upgrade that will not break the build, and I've also outlined the necessary steps to fully support the latest Alpine version by migrating to Python 3.

[gemini-code-assist]

This upgrade to alpine:3.21.5 will cause the Docker build to fail. The python2 package and its related development packages (python2-dev, py-setuptools), which are listed as dependencies in this Dockerfile, are not available in Alpine Linux versions newer than 3.15. Python 2 has reached its end of life and has been removed from the official repositories.

To resolve this, the ssd.py script needs to be migrated to Python 3, and the Dockerfile dependencies updated accordingly to use python3.

As an interim solution that still provides a significant security improvement over alpine:3.7 without breaking the build, you could use alpine:3.15, which is the last version that includes python2. However, the recommended long-term solution is to migrate to Python 3.

FROM alpine:3.15