Headline
CVE-2020-13927
The previous default setting for Airflow’s Experimental API was to allow all API requests without authentication, but this poses security risks to users who miss this fact. From Airflow 1.10.11 the default has been changed to deny all requests by default and is documented at https://airflow.apache.org/docs/1.10.11/security.html#api-authentication. Note this change fixes it for new installs but existing users need to change their config to default [api]auth_backend = airflow.api.auth.backend.deny_all as mentioned in the Updating Guide: https://github.com/apache/airflow/blob/1.10.11/UPDATING.md#experimental-api-will-deny-all-request-by-default
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This Metasploit module exploits an unauthenticated command injection vulnerability by combining two critical vulnerabilities in Apache Airflow version 1.10.10. The first, CVE-2020-11978, is an authenticated command injection vulnerability found in one of Airflow's example DAGs, "example_trigger_target_dag", which allows any authenticated user to run arbitrary OS commands as the user running Airflow Worker/Scheduler. The second, CVE-2020-13927, is a default setting of Airflow 1.10.10 that allows unauthenticated access to Airflow's Experimental REST API to perform malicious actions such as creating the vulnerable DAG above. The two CVEs taken together allow vulnerable DAG creation and command injection, leading to unauthenticated remote code execution.