OS Command Injection in Apache Kylin

Executive Summary

CVE-2026-62392 is an OS Command Injection vulnerability in Apache Kylin. It affects versions 4 through 5.0.3. The vulnerability occurs when a backend API improperly neutralizes special elements in job configuration parameters, allowing them to be passed directly to the OS command line. This can enable attackers to execute arbitrary commands on the system.

The issue is classified as an 'Improper Neutralization of Special Elements used in an OS Command' vulnerability. It is tracked under the identifier KYLIN-6091.

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Detection Guidance

Detecting CVE-2026-62392 on your network or system involves checking for signs of exploitation or verifying the installed version of Apache Kylin. Since this vulnerability arises from improper handling of job configuration parameters in a backend API, you can take the following steps:

• Check the installed version of Apache Kylin. The vulnerability affects versions 4 through 5.0.3. If your system runs any of these versions, it is vulnerable.
• Monitor network traffic and logs for unusual or unexpected OS command execution originating from Apache Kylin's backend API. Look for suspicious commands or parameters being passed to the system shell.
• Review Apache Kylin logs for any anomalies in job configuration parameters, especially those that include special characters or command-line syntax (e.g., semicolons, pipes, or backticks).
• Use vulnerability scanning tools that support CVE detection to identify if your Apache Kylin instance is vulnerable. Tools like Nessus, OpenVAS, or custom scripts can be configured to check for this CVE.

Example commands to check the Apache Kylin version (if accessible via command line or configuration files):

• Check the version in the Kylin installation directory, often found in a file like VERSION or via the Kylin web UI under 'About' or 'System Info'.
• If you have access to the Kylin server, you can run: cat /path/to/kylin/VERSION or grep -i version /path/to/kylin/conf/kylin.properties.

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Impact Analysis

This vulnerability can have severe impacts if exploited. Here are the potential consequences:

• Attackers could execute arbitrary commands on the affected system, leading to full system compromise.
• Sensitive data stored or processed by Apache Kylin could be accessed, modified, or deleted.
• The system could be used as a pivot point to launch further attacks within the network.
• Unauthorized actions, such as installing malware or creating backdoors, could be performed on the system.

The CVSS v3.1 score of 9.8 (Critical) indicates a high risk of exploitation with significant impacts on confidentiality, integrity, and availability.

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Compliance Impact

This vulnerability can impact compliance with several standards and regulations, depending on the data processed or stored by Apache Kylin:

• GDPR: If the system processes personal data of EU citizens, a breach could lead to unauthorized access or disclosure, violating GDPR requirements for data protection and breach notification.
• HIPAA: If the system handles protected health information (PHI), exploitation of this vulnerability could result in unauthorized access to PHI, violating HIPAA's Security Rule and Privacy Rule.
• PCI DSS: If the system processes payment card data, this vulnerability could lead to unauthorized access, violating PCI DSS requirements for securing cardholder data.
• Other industry-specific regulations may also be impacted if the system processes sensitive or regulated data.

Failure to mitigate this vulnerability could result in non-compliance, leading to fines, legal consequences, or reputational damage.

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Mitigation Strategies

To mitigate CVE-2026-62392, follow these immediate steps:

• Upgrade Apache Kylin to version 5.0.4 or later, as this version contains the fix for the vulnerability. This is the recommended and most effective mitigation step.
• If upgrading is not immediately possible, restrict access to the Apache Kylin backend API. Limit network access to trusted IP addresses or networks to reduce the risk of exploitation.
• Monitor and audit job configuration parameters submitted to the backend API. Implement input validation to block or sanitize special characters that could be used for command injection.
• Review and harden the system running Apache Kylin. Ensure that the user account running Kylin has the least privileges necessary to operate, reducing the impact of a successful exploit.
• Enable detailed logging for Apache Kylin and monitor for any suspicious activity, such as unexpected command execution or unusual job configurations.

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