CVE-2021-38540 is a critical vulnerability affecting Apache Airflow versions between 2.0.0 and 2.1.3. The flaw arises from the variable import endpoint not being protected by authentication, allowing unauthenticated users to access it. This vulnerability can lead to unauthorized modification of Airflow variables used in Directed Acyclic Graphs (DAGs), which poses significant risks such as denial of service, information disclosure, and remote code execution.
With a CVSS score of 9.8, this vulnerability is classified as critical, indicating a severe impact on organizations using affected versions of Apache Airflow. The ease of exploitation and the potential consequences necessitate immediate attention from security teams. Organizations should prioritize patching to prevent possible exploitation of this vulnerability.
The vulnerability was published on September 9, 2021, and has since been modified to reflect its status accurately. Given the high severity and the potential for exploitation, it is crucial for organizations to assess their current Airflow installations and apply necessary patches urgently.
According to the latest data, the exploitation status of this vulnerability indicates that a proof of concept exists, highlighting the urgent need for remediation measures. Organizations must act swiftly to mitigate risks associated with this vulnerability.
Vulnerability Details
The vulnerability allows unauthenticated users to exploit the variable import endpoint in Apache Airflow. Specifically, it permits the addition and modification of Airflow variables without authentication checks, which could be leveraged for various malicious intents. The specific versions affected are those between 2.0.0 and 2.1.3.
This vulnerability has been classified with two Common Weakness Enumerations (CWEs): CWE-269 (Improper Privilege Management) and CWE-306 (Missing Authentication for Critical Function). These classifications highlight the underlying security flaws that contribute to the vulnerability.
The CVSS score of 9.8 indicates a critical vulnerability due to its network attack vector, low attack complexity, and the absence of required privileges or user interaction. The potential impacts are high across confidentiality, integrity, and availability.
Technical Analysis
The root cause of CVE-2021-38540 lies in the lack of authentication for the variable import endpoint. This oversight allows attackers to send requests to the endpoint without requiring any form of authentication, making it easy to manipulate variables within Airflow. The attack vector is network-based and requires no user interaction, thus making it highly exploitable.
Given the attack's low complexity and the fact that no privileges are required, even a novice attacker can exploit this vulnerability. The potential impacts on confidentiality, integrity, and availability are severe, as unauthorized access to critical components can lead to significant operational disruptions.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive Airflow configurations, leading to potential denial of service or data breaches. The ability for attackers to modify DAGs and associated variables means that they can disrupt workflows, potentially leading to significant downtime and data loss.
The broad deployment of Apache Airflow in various environments increases the urgency for organizations to remediate this vulnerability. With a high likelihood of exploitation, organizations should prioritize patching to prevent possible attacks. The vulnerability's criticality and the potential for widespread impact necessitate immediate action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Apache Airflow versions 2.0.0 through 2.1.2. Organizations running these versions should take immediate action to update to the latest version to mitigate risks.
Mitigation & Remediation
Organizations should prioritize patching immediately. Upgrading to the latest version of Apache Airflow will address the vulnerability. If a patch is not available, organizations should implement workarounds, such as restricting access to the variable import endpoint through network controls.
To enhance security, organizations can also consider conducting regular security assessments and penetration testing. For further assistance, organizations can explore services like penetration testing to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for unauthorized access attempts to the variable import endpoint. Additionally, any behavioral anomalies or unexpected changes to Airflow variables should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-38540 lies in its reflection of the importance of implementing robust authentication mechanisms, particularly for critical endpoints. As vulnerabilities like this can lead to severe operational disruptions, security teams must prioritize secure coding practices and regular security assessments.
For organizations leveraging Apache technologies, this vulnerability serves as a reminder to continuously evaluate the security posture of their applications. Regular updates and security assessments can help mitigate risks associated with evolving threats.
Organizations should also consider exploring best practices in application security, such as the penetration testing methodology, to strengthen their defenses against potential vulnerabilities.
Lastly, security teams should stay informed about trends and vulnerabilities related to their technologies, which can be facilitated by leveraging resources like the vulnerability management program to ensure proactive mitigation of risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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