Improper Access Control on Configurations Endpoint for the Stable API of Apache Airflow allows users with Viewer or User role to get Airflow Configurations including sensitive information even when [webserver] expose_config is set to False in airflow.cfg. This allowed a privilege escalation attack. This issue affects Apache Airflow 2.0.0.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-26559
• https://github.com/apache/airflow/blob/486b76438c0679682cf98cb88ed39c4b161cbcc8/CHANGELOG.txt
• https://lists.apache.org/thread.html/r3b3787700279ec361308cbefb7c2cce2acb26891a12ce864e4a13c8d%40%3Cusers.airflow.apache.org%3E
• https://lists.apache.org/thread.html/rd142565996d7ee847b9c14b8a9921dcf80bc6bc160e3d9dca6dfc2f8@%3Cannounce.apache.org%3E
• http://www.openwall.com/lists/oss-security/2021/02/17/1
• apache/airflow@3909232
• apache/airflow@5e35926
• GHSA-ffw3-6mp6-jmvj
• https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-2.yaml