Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-3065 is a critical command injection vulnerability in HummerRisk versions up to 1.5.0. It affects the function CommandUtils.commonExecCmdWithResult in the CloudTaskService.java file within the Cloud Task Dry-run component. The vulnerability arises because the "fileName" parameter is directly used in constructing a shell command without any validation or sanitization, allowing attackers to inject and execute arbitrary operating system commands remotely.'}, {'type': 'paragraph', 'content': 'This flaw corresponds to CWE-77 and CWE-78, indicating that externally influenced input is used unsafely to build commands, leading to unauthorized command execution. The vulnerability can be exploited remotely by attackers with dry-run task permissions, and a public proof-of-concept exploit is available.'}] [1, 2, 3]

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Impact Analysis

This vulnerability allows immediate remote code execution (RCE) with the privileges of the hummer-risk user, potentially leading to unauthorized control over the affected system.

• Attackers can execute arbitrary OS commands, including launching reverse shells.
• Potential privilege escalation if sudo is configured.
• Data exfiltration such as reading sensitive files (e.g., /etc/passwd), environment variable theft, and credential disclosure.
• Persistence mechanisms like backdoors or cron jobs can be installed.
• Lateral movement within the network and cloud credential theft.
• Complete exposure of cloud infrastructure, data breaches, and service disruption.

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Compliance Impact

This vulnerability can lead to compliance violations with common standards and regulations such as GDPR, PCI DSS, and SOC 2 due to unauthorized data access, data breaches, and potential exposure of sensitive information.

Exploitation may result in loss of confidentiality, integrity, and availability of data, which are critical requirements under these regulations.

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for suspicious "fileName" parameter values that contain shell metacharacters or command keywords such as curl, wget, bash, nc, and cat.'}, {'type': 'paragraph', 'content': 'Unusual API activity, such as a high frequency of dry-run requests or large parameter payloads, may also indicate exploitation attempts.'}, {'type': 'paragraph', 'content': 'A Sigma detection rule is available to identify immediate command injection attempts targeting this vulnerability.'}, {'type': 'paragraph', 'content': 'Suggested detection commands include inspecting logs for suspicious "fileName" values and monitoring network traffic for unusual POST requests to the /task/manual/dryRun API endpoint.'}] [2]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include implementing strict input validation on the "fileName" parameter to enforce a safe format and block dangerous characters such as ; & | ` $ () <> * ? [] { } \' " \\.'}, {'type': 'paragraph', 'content': "Use safe command execution APIs like Java's ProcessBuilder with argument arrays to avoid shell interpretation instead of Runtime.exec() with shell commands."}, {'type': 'paragraph', 'content': 'Enforce a whitelist of valid Prowler check names and use parameterized command construction patterns to prevent injection.'}, {'type': 'paragraph', 'content': 'Additional recommendations include conducting architecture reviews, developer security training, mandatory code reviews, deploying WAF rules, audit logging, monitoring for suspicious patterns, and rate limiting on the dry-run endpoint.'}, {'type': 'paragraph', 'content': 'If possible, consider replacing the affected product as no official vendor mitigations have been provided.'}] [2, 1]

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