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Insecure service configuration - Docker

Description​

Using the ADD command to automatically extract files to the destination directory adds the risk of exploiting vulnerabilities such as zip bombs and Zip Slip that could then be activated automatically.

Impact​

Expose the system to zip-based vulnerabilities

Recommendation​

Avoid the use of the ADD command unless you need extract a local tar file. Instead, use the COPY command

Threat​

Authenticated local attacker with access to the container

Expected Remediation Time​

⌚ 20 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: L
  • Attack complexity: H
  • Privileges required: L
  • User interaction: N
  • Scope: U
  • Confidentiality: N
  • Integrity: L
  • Availability: N

Temporal​

  • Exploit code madurity: P
  • Remediation level: O
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
  • Score:
    • Base: 2.5
    • Temporal: 2.3
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

The Docker service avoids the use of the ADD command

FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
RUN apk add --no-cache gcc musl-dev
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
CMD ["flask", "run"]

Non compliant code​

The Docker service performs an insecure use of the ADD command

FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
RUN apk add --no-cache gcc musl-dev
ADD requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
CMD ["flask", "run"]

Requirements​

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