CVE-2002-1863 in Network Attached Storage
Summary
by MITRE
Iomega Network Attached Storage (NAS) A300U, and possibly other models, does not allow the FTP service to be disabled, which allows local users to access home directories via FTP even when access to all shared directories have been disabled.
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Analysis
by VulDB Data Team • 04/19/2019
The vulnerability identified as CVE-2002-1863 affects Iomega Network Attached Storage devices, specifically the A300U model and potentially other variants within the product line. This represents a critical security flaw in the device's configuration management that undermines the fundamental principle of least privilege and access control. The issue stems from the inability to properly disable the File Transfer Protocol service, creating a persistent attack surface that persists regardless of user-defined security policies.
The technical implementation flaw resides in the device's firmware design where the FTP service operates as a mandatory component that cannot be selectively disabled through standard administrative interfaces. This architectural weakness creates an unintended access path that bypasses the intended security controls for shared directory access. When administrators disable access to shared directories through the graphical user interface or configuration tools, the FTP service continues to operate and provide access to home directories, effectively rendering the security configuration ineffective. This represents a clear violation of the principle of defense in depth as multiple layers of security controls are bypassed by a single persistent service.
From an operational impact perspective, this vulnerability creates a significant risk for organizations deploying Iomega NAS devices in environments where data protection and access control are paramount. Local users who gain access to the device can exploit this flaw to access sensitive home directory contents, potentially including personal files, configuration data, and other confidential information. The vulnerability is particularly concerning because it operates silently in the background without alerting administrators to its presence, making it difficult to detect and remediate. The persistent nature of the FTP service means that even if administrators believe they have properly configured access controls, the vulnerability continues to exist and can be exploited by both malicious insiders and external attackers who gain local access to the device.
The security implications extend beyond simple unauthorized access to encompass potential data exfiltration and privilege escalation scenarios. This vulnerability aligns with CWE-693, which addresses Protection Mechanism Failure, and demonstrates a clear breakdown in access control mechanisms. The flaw also relates to ATT&CK technique T1078.004, which covers valid accounts for lateral movement and persistence, as the persistent FTP service provides a stable access point for attackers to maintain presence on the system. Organizations should implement immediate mitigations including firmware updates where available, network segmentation to isolate the NAS devices, and monitoring for unauthorized FTP access attempts. The vulnerability highlights the importance of proper service management in embedded systems and underscores the need for administrators to regularly audit device configurations to ensure that all services are properly controlled and that access controls function as intended.