gem install without version
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Id: 22cd11f7-9c6c-4f6e-84c0-02058120b341
Cloud Provider: Dockerfile
Platform: Dockerfile
Severity: Medium
Category: Supply-Chain
Learn More
Description
Unpinned Ruby gem installs in Dockerfile RUN commands allow unintentional upgrades or malicious releases to be pulled at build time, increasing risk of supply-chain compromise and causing non-reproducible or breakage-prone images.
This rule inspects Dockerfile RUN instructions that invoke gem install and requires each gem to include an explicit version, for example, via -v <version> or --version <version> (or other recognized inline version syntax). Both single-line RUN strings and tokenized RUN commands are analyzed. Any gem argument that is a plain package name without a following version flag or embedded version will be flagged.
Secure examples:
RUN gem install bundler -v 2.3.7 rake -v 13.0.6
RUN gem install rails --version '6.1.7'
Compliant Code Examples
FROM alpine:3.5
RUN apk add --update py2-pip
RUN gem install bundler:2.0.2
RUN bundle install
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"]
ENV GRPC_VERSION 1.0.0
RUN gem install grpc -v ${GRPC_RUBY_VERSION}
RUN gem install grpc:${GRPC_VERSION} grpc-tools:${GRPC_VERSION}
Non-Compliant Code Examples
FROM alpine:3.5
RUN apk add --update py2-pip
RUN gem install bundler
RUN ["gem", "install", "blunder"]
RUN gem install grpc -v ${GRPC_RUBY_VERSION} blunder
RUN bundle install
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"]
