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Cloud Provider: Dockerfile
Platform: Dockerfile
Severity: Low
Category: Supply-Chain
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Description
Using the interactive apt front-end in Dockerfile RUN instructions is discouraged because its user-facing behavior can change between versions and it may prompt for input during non-interactive image builds. This can cause build failures or incomplete/incorrect package installations that leave images outdated or inconsistent.
This rule flags Dockerfile RUN commands that invoke the token apt (for example RUN apt ...) and instead requires using scripting-friendly tools such as apt-get and apt-cache. Replace apt with apt-get/apt-cache, run apt-get update before installs, use non-interactive and affirmative flags (for example, -y --no-install-recommends), and clean apt caches to reduce image size and avoid stale state.
Secure example:
RUN apt-get update && apt-get install -y --no-install-recommends <package> && rm -rf /var/lib/apt/lists/*
Compliant Code Examples
FROM busybox:1.0
RUN apt-get install curl
HEALTHCHECK CMD curl --fail http://localhost:3000 || exit 1
Non-Compliant Code Examples
FROM busybox:1.0
RUN apt install curl
HEALTHCHECK CMD curl --fail http://localhost:3000 || exit 1
