Executive Summary

CVE-2026-3064 is a critical command injection vulnerability in HummerRisk versions up to 1.5.0, specifically in the Cloud Task Scheduler component within the file ResourceCreateService.java.

The vulnerability arises from improper handling of the argument regionId, which is accepted via a REST API endpoint and stored unsanitized in the database. During task cleanup, this regionId is concatenated directly into shell commands executed on the server without proper input validation or sanitization.

This allows attackers with permission to create cloud scanning tasks to inject arbitrary operating system commands using shell metacharacters, leading to remote code execution (RCE) on the HummerRisk server with the privileges of the hummer-risk user.

The vulnerability is classified under CWE-77 and CWE-78, indicating unsafe command construction and execution based on externally influenced input. Exploitation techniques include injecting reverse shells, data exfiltration commands, arbitrary file deletion, and web shell uploads.

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Impact Analysis

This vulnerability can have severe impacts including remote code execution on the affected server, allowing attackers to execute arbitrary commands with the privileges of the hummer-risk user.

• Data exfiltration of sensitive information.
• Arbitrary file deletion, including critical system files via path traversal.
• Persistence through backdoors or web shells, enabling long-term unauthorized access.
• Lateral movement within internal networks and cloud infrastructure.
• Potential privilege escalation to root if sudo is configured.
• Full compromise of cloud scanning infrastructure and associated cloud resources.

Overall, the vulnerability threatens confidentiality, integrity, and availability of the affected systems and data.

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Compliance Impact

[{'type': 'paragraph', 'content': 'The vulnerability can lead to data breaches and unauthorized access to sensitive information, which directly impacts compliance with regulations such as GDPR, HIPAA, PCI DSS, and SOC 2.'}, {'type': 'paragraph', 'content': "Exploitation may result in exposure of personal data, loss of data integrity, and disruption of services, all of which are violations of these standards' requirements for data protection, confidentiality, and availability."}, {'type': 'paragraph', 'content': 'Organizations using affected versions of HummerRisk may face legal and regulatory consequences if this vulnerability is exploited and leads to non-compliance.'}] [3]

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Detection Guidance

[{'type': 'paragraph', 'content': 'Detection and monitoring of this vulnerability involve monitoring for suspicious regionId values containing shell metacharacters or command keywords.'}, {'type': 'paragraph', 'content': 'You should monitor logs for unusual command patterns such as rm -rf with unexpected paths, reverse shell indicators, or data exfiltration commands.'}, {'type': 'paragraph', 'content': 'A Sigma detection rule is available to identify potential command injection attempts via the regionId parameter.'}, {'type': 'paragraph', 'content': 'Specifically, you can check database entries for regionId values containing characters like ;, &&, |, or suspicious payloads.'}, {'type': 'paragraph', 'content': 'Commands to detect suspicious inputs might include searching logs or database entries for these patterns, for example using grep:'}, {'type': 'list_item', 'content': 'grep -rE ";|&&|\\||\\$|\\(|\\)" /path/to/logs'}, {'type': 'list_item', 'content': 'SELECT * FROM cloud_task_item WHERE region_id REGEXP \'[;&|$()<>*?\\[\\]{}"\\\'\\\\]\''}, {'type': 'paragraph', 'content': 'Additionally, monitoring for unexpected network connections or reverse shell activity on the server may help detect exploitation attempts.'}] [3]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include strict input validation on the regionId parameter to allow only valid region formats and block dangerous characters such as ;, &, |, $, (, ), <, >, *, ?, [, ], {, }, \', and ".'}, {'type': 'paragraph', 'content': "Replace unsafe shell command executions with safe Java APIs for file operations, such as Apache Commons IO's FileUtils.deleteDirectory() or Java NIO's Files.walk(), avoiding shell invocation."}, {'type': 'paragraph', 'content': 'Implement whitelisting of valid region IDs per cloud provider to reject invalid or malicious inputs.'}, {'type': 'paragraph', 'content': 'Validate paths to prevent path traversal by ensuring constructed paths remain within expected base directories.'}, {'type': 'paragraph', 'content': 'Consider replacing the affected product with an alternative, as no vendor mitigations have been provided.'}, {'type': 'paragraph', 'content': 'In the short term, monitor for suspicious inputs and commands, deploy WAF rules if possible, enforce least privilege principles, and conduct audit logging.'}] [3, 1]

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