Metadata

Id: dockerfile-yum-install-allows-manual-input

Platform: Dockerfile

Severity: Low

Category: Supply-Chain

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Description

RUN instructions that invoke yum install without a non-interactive flag can prompt for user input during image builds, causing automated CI/CD pipelines to hang or produce inconsistent images when builds are completed manually.

Check Dockerfile RUN commands for invocations of yum install (including groupinstall or localinstall). The command must include a non-interactive flag such as -y, yes, or --assumeyes. This rule flags RUN entries where a yum install is detected but none of those flags are present. It applies to both single-string RUN commands and list-form RUN arguments.

Secure example:

RUN yum -y install curl

Compliant Code Examples

FROM alpine:3.5
RUN apk add --update py2-pip
RUN sudo yum install -y bundler
COPY requirements.txt /usr/src/app/
RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt
COPY app.py /usr/src/app/
COPY templates/index.html /usr/src/app/templates/
EXPOSE 5000
CMD ["python", "/usr/src/app/app.py"] 

Non-Compliant Code Examples

FROM alpine:3.5
RUN apk add --update py2-pip
RUN sudo yum install bundler
RUN ["sudo yum", "install", "bundler"]
COPY requirements.txt /usr/src/app/
RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt
COPY app.py /usr/src/app/
COPY templates/index.html /usr/src/app/templates/
EXPOSE 5000
CMD ["python", "/usr/src/app/app.py"]