CVE-2016-3997 in Clustered Data ONTAP
Summary
by MITRE
NetApp Clustered Data ONTAP allows man-in-the-middle attackers to obtain sensitive information, gain privileges, or cause a denial of service by leveraging failure to enable SMB signing enforcement in its default state.
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Analysis
by VulDB Data Team • 10/21/2019
The vulnerability identified as CVE-2016-3997 affects NetApp Clustered Data ONTAP systems where the Server Message Block protocol implementation fails to enforce SMB signing by default. This represents a critical security weakness that exposes systems to various attack vectors including man-in-the-middle assaults, unauthorized privilege escalation, and denial of service conditions. The flaw exists within the default configuration of the storage operating system, meaning that organizations deploying these systems without explicit security hardening are immediately vulnerable to exploitation.
This vulnerability directly relates to CWE-310, which addresses cryptographic weakness and specifically targets the absence of proper message authentication codes in network communications. The lack of SMB signing enforcement creates opportunities for attackers to intercept, modify, or inject malicious data into SMB traffic between clients and the NetApp storage systems. The default state of the system fails to implement the necessary cryptographic protections that would normally validate the authenticity and integrity of SMB messages, allowing threat actors to manipulate network communications without detection.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass complete system compromise potential. Attackers can leverage this weakness to establish persistent access to storage resources, escalate privileges through manipulated SMB sessions, or disrupt critical business operations through denial of service attacks. The nature of SMB signing enforcement failure means that even legitimate users may be vulnerable to attacks that exploit the trust relationships established between network components. This creates a fundamental weakness in the authentication and integrity verification mechanisms that are essential for protecting enterprise storage infrastructure.
Organizations should implement immediate mitigations including explicit enabling of SMB signing enforcement through proper system configuration and security policy implementation. The recommended approach involves configuring the NetApp Clustered Data ONTAP systems to require SMB signing for all SMB sessions, which can be achieved through the system's security management interfaces. Additionally, network segmentation and monitoring solutions should be deployed to detect anomalous SMB traffic patterns that may indicate exploitation attempts. Compliance with industry standards such as the NIST SP 800-128 guidelines for SMB security and the MITRE ATT&CK framework's network infiltration techniques should inform the remediation strategy, ensuring that both immediate and long-term security postures are strengthened against similar vulnerabilities.
The vulnerability demonstrates the critical importance of secure default configurations in enterprise storage systems and highlights the need for comprehensive security assessments during system deployment. Organizations must recognize that default settings often represent the weakest link in security implementations and that proactive security hardening is essential for protecting against sophisticated attack vectors that exploit such fundamental protocol weaknesses. Regular security audits and configuration reviews should be conducted to ensure that SMB signing enforcement remains enabled and that no regressions occur in the security posture over time.