Path Traversal in Tenable Agent

Executive Summary

CVE-2026-15265 is a path traversal vulnerability found in Tenable Agent versions 11.2.0, 11.1.3, and earlier. This flaw allows a privileged attacker to write arbitrary files outside the intended plugin directory.

Path traversal vulnerabilities occur when an application does not properly validate or sanitize user-supplied input used to construct file paths. In this case, the attacker can manipulate file paths to access or write files in locations they should not have access to.

If exploited, this vulnerability could lead to remote code execution, meaning an attacker could execute arbitrary commands or code on the affected system with the privileges of the Tenable Agent.

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Detection Guidance

Detecting this vulnerability requires checking for the presence of vulnerable versions of Tenable Agent (11.2.0, 11.1.3, or lower) and verifying if the system allows unauthorized file writes outside the intended plugin directory.

• Check the installed version of Tenable Agent by running the following command on the system where the agent is installed: 'tenable-agent --version' or by inspecting the package manager (e.g., 'rpm -qa | grep tenable-agent' on RPM-based systems or 'dpkg -l | grep tenable-agent' on Debian-based systems).
• Review system logs for unusual file creation or modification events outside the Tenable Agent's plugin directory. This may indicate exploitation attempts.
• Use file integrity monitoring tools to detect unauthorized changes to critical system directories, especially those writable by the Tenable Agent process.

Since the vulnerability allows arbitrary file writes, manual inspection of the plugin directory and surrounding directories for unexpected files may also help identify exploitation.

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Impact Analysis

The impact of this vulnerability depends on the environment in which Tenable Agent is deployed and the privileges it holds. Here are potential impacts:

• Remote Code Execution (RCE): An attacker with privileged access could execute arbitrary code on the system where the Tenable Agent is installed. This could lead to full system compromise, data theft, or further lateral movement within a network.
• Arbitrary File Write: The attacker could write malicious files to sensitive locations on the system, potentially disrupting operations or installing backdoors for persistent access.
• Privilege Escalation: If the Tenable Agent runs with elevated privileges, the attacker could escalate their privileges on the system, gaining control over additional resources or systems.
• Data Breach: If the affected system processes or stores sensitive data, the attacker could exfiltrate or manipulate this data, leading to a breach of confidentiality or integrity.
• Operational Disruption: The attacker could disrupt the normal operation of the Tenable Agent or the host system, leading to downtime or loss of service.

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Compliance Impact

This vulnerability could have significant implications for compliance with various standards and regulations, depending on the context in which Tenable Agent is used. Below are potential impacts on common compliance frameworks:

• GDPR (General Data Protection Regulation): If the affected system processes personal data of EU citizens, exploitation of this vulnerability could lead to unauthorized access or exfiltration of that data. This would constitute a breach of GDPR, potentially resulting in hefty fines (up to 4% of global annual revenue or €20 million, whichever is higher) and reputational damage.
• HIPAA (Health Insurance Portability and Accountability Act): If the Tenable Agent is deployed in a healthcare environment or processes protected health information (PHI), this vulnerability could lead to unauthorized access or disclosure of PHI. This would violate HIPAA's Security Rule and Privacy Rule, potentially resulting in fines and legal action.
• PCI DSS (Payment Card Industry Data Security Standard): If the affected system is part of a cardholder data environment (CDE), exploitation of this vulnerability could lead to unauthorized access to payment card data. This would violate multiple PCI DSS requirements, potentially leading to fines, increased transaction fees, or loss of the ability to process payment cards.
• ISO 27001: This standard requires organizations to implement controls to manage information security risks. Exploitation of this vulnerability would indicate a failure to adequately protect systems from unauthorized access or modification, potentially leading to non-compliance and loss of certification.
• NIST CSF (Cybersecurity Framework): This framework emphasizes identifying, protecting, detecting, responding to, and recovering from cybersecurity threats. Exploitation of this vulnerability would highlight gaps in the 'Protect' and 'Detect' functions, potentially leading to regulatory scrutiny or contractual penalties.

Organizations should assess whether this vulnerability affects systems within the scope of their compliance obligations and take appropriate remediation steps to mitigate risks.

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Mitigation Strategies

To mitigate this vulnerability, follow these immediate steps:

• Upgrade Tenable Agent to the latest version that includes a fix for this vulnerability. Contact Tenable support or check their official advisories for the patched version.
• If upgrading is not immediately possible, restrict the privileges of the Tenable Agent process to minimize the impact of potential exploitation. Ensure the agent runs with the least privileges necessary.
• Monitor the system for suspicious file creation or modification events, particularly in directories outside the intended plugin directory.
• Implement network-level controls to limit access to the Tenable Agent's management interface, reducing the attack surface.
• Review and harden file system permissions to prevent unauthorized writes to sensitive directories.

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