Apache Airflow Docker's Provider shipped with an example DAG that was vulnerable to (authenticated) remote code exploit of code on the Airflow worker host.
##Vulnerability summary:
In DAG script of airflow 2.3.3, there is a command injection vulnerability (RCE) in the script (example_docker_copy_data.py of docker provider), which can obtain the permission of the operating system.
source path:
airflow-2.3.3/airflow/providers/docker/example_dags/example_docker_copy_data.py
##Vulnerability details：
(1) Vulnerability principle：
1. It can be seen from the source code of example_docker_copy_data.py script that there is the function of executing bash command, The parameter ‘source_location’ in the template expression {{params.source_location}} is externally controllable and rendered through the jiaja2 template:
{F1869746}
2. Further analysis “from airflow.operators.bash import BashOperator” code, we can see bash_command parameter value will be executed as a bash script;
{F1869748}
(2)Vulnerability exploit：
1. Enter the DAGs menu and start docker_sample_copy_data task, select “Trigger DAG w/ config”.
http://192.168.3.17:8080/trigger?dag_id=docker_sample_copy_data
{F1869749}
2. To construct payload, we can separate commands with ‘;’, so as to inject any operating system commands to be executed(RCE).
{F1869750}
PAYLOAD：```{"source_location":";touch /tmp/thisistest;"}```, Then click trigger to execute the task.
{F1869755}
The final command is as follows:
```locate_file_cmd = “”” sleep 10
find ;touch /tmp/thisistest; -type f -printf “%f\n” | head -1
“””
```
Through the log and server view, it can be seen that arbitrary command has been executed successfully.
{F1869756}
{F1869757}
## Impact
An attacker can execute arbitrary commands on the airflow host.
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It can be seen from the source code of example_docker_copy_data.py script that there is the function of executing bash command, The parameter \u2018source_location\u2019 in the template expression {{params.source_location}} is externally controllable and rendered through the jiaja2 template: \n\n{F1869746}\n\n2. Further analysis \u201cfrom airflow.operators.bash import BashOperator\u201d code, we can see bash_command parameter value will be executed as a bash script;\n\n{F1869748}\n\n(2)Vulnerability exploit\uff1a\n1. Enter the DAGs menu and start docker_sample_copy_data task, select \u201cTrigger DAG w/ config\u201d. \n\nhttp://192.168.3.17:8080/trigger?dag_id=docker_sample_copy_data\n\n{F1869749}\n\n2. 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The platform is scalable and dynamically monitored, etc. A remote code execution vulnerability exists in versions of Apache Airflow prior to 3.0.0. The vulnerability stems from the fact that the code provided in the sample DAG on the Airflow work host is vulnerable to exploitation by (authenticated) remote code. An attacker could exploit this vulnerability to cause remote code execution.", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2022-08-19T00:00:00", "type": "cnvd", "title": "Apache Airflow Remote Code Execution Vulnerability (CNVD-2022-59057)", "bulletinFamily": "cnvd", "cvss2": {}, "cvelist": ["CVE-2022-38362"], "modified": "2022-08-24T00:00:00", "id": "CNVD-2022-59057", "href": "https://www.cnvd.org.cn/flaw/show/CNVD-2022-59057", "cvss": {"score": 0.0, "vector": "NONE"}}], "osv": [{"lastseen": "2023-04-13T18:01:16", "description": "Apache Airflow Docker's Provider prior to 3.0.0 shipped with an example DAG that was vulnerable to (authenticated) remote code exploit of code on the Airflow worker host. Disable loading of example DAGs or upgrade apache-airflow-providers-docker to 3.0.0 or above.", "cvss3": {"exploitabilityScore": 2.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2022-08-17T00:00:21", "type": "osv", "title": "Remote code execution in Apache Airflow Docker's Provider", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2022-38362"], "modified": "2023-04-13T18:00:59", "id": "OSV:GHSA-746V-HFH2-XPHM", "href": "https://osv.dev/vulnerability/GHSA-746v-hfh2-xphm", "cvss": {"score": 0.0, "vector": "NONE"}}]}
Internet Bug Bounty: CVE-2022-38362: Apache Airflow Docker Provider <3.0 RCE vulnerability in example dag
