CVE-2023-25754: Apache Airflow Privilege Escalation Flaw

CVE-2023-25754 Overview

CVE-2023-25754 is a Privilege Context Switching Error vulnerability affecting Apache Airflow, a popular open-source platform for programmatically authoring, scheduling, and monitoring workflows. This vulnerability exists in Apache Airflow versions prior to 2.6.0 and relates to improper handling of privilege contexts during execution, potentially allowing unauthorized access to elevated privileges.

Critical Impact

This vulnerability enables attackers to exploit privilege context switching errors in Apache Airflow, potentially leading to complete system compromise with impacts on confidentiality, integrity, and availability of affected systems.

Affected Products

• Apache Airflow versions prior to 2.6.0

Discovery Timeline

• 2023-05-08 - CVE-2023-25754 published to NVD
• 2025-02-13 - Last updated in NVD database

Technical Details for CVE-2023-25754

Vulnerability Analysis

This vulnerability is classified as CWE-270 (Privilege Context Switching Error), which occurs when a system fails to properly manage privilege contexts during transitions between different execution states. In Apache Airflow, this flaw allows the application to improperly handle privilege boundaries, potentially enabling unauthorized users to access resources or execute operations that should require elevated privileges.

The vulnerability is remotely exploitable without requiring authentication or user interaction, making it particularly dangerous for internet-facing Airflow deployments. Successful exploitation could result in complete compromise of the affected system, including unauthorized data access, modification of workflow configurations, and potential disruption of orchestrated tasks.

Root Cause

The root cause of CVE-2023-25754 lies in Apache Airflow's improper handling of privilege context transitions. When the application switches between different privilege contexts during workflow execution or user session handling, it fails to properly validate and enforce the appropriate privilege level. This allows an attacker to maintain or escalate privileges beyond their intended authorization level.

The vulnerability was addressed in GitHub Pull Request #29506, which implemented proper privilege context management to ensure correct privilege boundaries are maintained during context switches.

Attack Vector

The attack vector is network-based, allowing remote attackers to exploit this vulnerability without requiring any prior authentication or user interaction. An attacker could target exposed Apache Airflow instances and exploit the privilege context switching flaw to:

1. Gain unauthorized access to restricted workflows and data
2. Execute arbitrary tasks with elevated privileges
3. Modify DAG (Directed Acyclic Graph) configurations
4. Access sensitive connection credentials stored in Airflow
5. Potentially achieve remote code execution through malicious task injection

The vulnerability mechanism involves exploiting the improper privilege boundary enforcement during context transitions within Airflow's execution model. Technical details of the exploitation path can be found in the Apache Mailing List disclosure and the Openwall OSS Security discussion.

Detection Methods for CVE-2023-25754

Indicators of Compromise

• Unexpected privilege escalations in Airflow audit logs showing users accessing resources beyond their authorization level
• Anomalous DAG executions or modifications by unauthorized user accounts
• Unusual API requests to Airflow endpoints from unexpected sources or with abnormal access patterns
• Authentication log entries showing successful access to privileged operations without proper authorization chain

Detection Strategies

• Monitor Apache Airflow access logs for unusual patterns of privilege usage or context switching anomalies
• Implement network traffic analysis to detect suspicious API calls to Airflow endpoints
• Deploy SentinelOne Singularity Platform to detect and respond to exploitation attempts targeting Airflow deployments
• Review Airflow audit logs for signs of unauthorized workflow modifications or credential access

Monitoring Recommendations

• Enable comprehensive audit logging in Apache Airflow and forward logs to a SIEM solution
• Monitor for unexpected changes to DAG configurations, connections, or user permissions
• Implement alerting for failed authentication attempts followed by successful privileged operations
• Use SentinelOne's behavioral AI to detect post-exploitation activities on Airflow host systems

How to Mitigate CVE-2023-25754

Immediate Actions Required

• Upgrade Apache Airflow to version 2.6.0 or later immediately
• Restrict network access to Airflow instances using firewall rules and network segmentation
• Audit current Airflow deployments for signs of compromise before and after patching
• Review and validate all user permissions and role assignments in Airflow

Patch Information

Apache Software Foundation has addressed this vulnerability in Apache Airflow version 2.6.0. The fix was implemented through Pull Request #29506 which corrects the privilege context switching behavior. Organizations should upgrade to version 2.6.0 or later to remediate this vulnerability.

Additional details about the vulnerability and fix can be found in the Apache Mailing List announcement.

Workarounds

• Implement strict network segmentation to limit access to Airflow web interface and API endpoints
• Deploy a reverse proxy with additional authentication layers in front of Airflow
• Apply principle of least privilege to all Airflow user accounts and service accounts
• Consider temporarily disabling external access to Airflow until the patch can be applied

# Configuration example - Restrict Airflow network access via firewall
# Allow access only from trusted internal networks
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP

# Verify current Airflow version
airflow version

# Upgrade Airflow to patched version
pip install --upgrade "apache-airflow>=2.6.0"