CVE-2023-4929 in NPort 5000
Summary
by MITRE • 10/25/2023
All firmware versions of the NPort 5000 Series are affected by an improper validation of integrity check vulnerability. This vulnerability results from insufficient checks on firmware updates or upgrades, potentially allowing malicious users to manipulate the firmware and gain control of devices.
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Analysis
by VulDB Data Team • 10/25/2023
The NPort 5000 Series industrial network devices represent critical infrastructure components used for serial communication and network connectivity in industrial environments. These devices serve as gateways between serial devices and ethernet networks, making them essential for operational technology systems in manufacturing, energy, and other critical sectors. The vulnerability identified in CVE-2023-4929 specifically targets the firmware update mechanism, which is fundamental to maintaining device security and functionality. This weakness exists across all firmware versions of the affected series, indicating a systemic design flaw rather than a transient issue that could be resolved through simple patches.
The core technical flaw manifests in the improper validation of integrity checks during firmware update processes. This vulnerability falls under the CWE-347 category of "Improper Verification of Cryptographic Signature" and represents a critical weakness in the device's security architecture. The insufficient validation mechanisms fail to properly verify the authenticity and integrity of firmware images before installation, creating a pathway for attackers to manipulate firmware updates. This weakness allows malicious actors to potentially replace legitimate firmware with malicious code, effectively compromising the device's operational integrity and security posture.
The operational impact of this vulnerability extends beyond simple device compromise, as it fundamentally undermines the security model of industrial network infrastructure. Attackers exploiting this vulnerability could gain persistent control over affected devices, potentially leading to unauthorized access to industrial networks, data exfiltration, or disruption of critical operations. The implications are particularly severe in operational technology environments where device availability and integrity are paramount for system reliability. This vulnerability could enable attackers to establish persistent backdoors, modify device configurations, or even cause physical damage to industrial processes through malicious firmware manipulation.
Mitigation strategies should focus on immediate network segmentation and monitoring of firmware update activities to detect anomalous behavior. Organizations should implement strict firmware validation procedures, including cryptographic signature verification and integrity checking before any firmware installation. The vulnerability aligns with ATT&CK technique T1547.001 for registry run keys and T1078 for valid accounts, as attackers may use compromised devices to establish persistence within industrial networks. Additionally, implementing network access controls, disabling unnecessary network services, and maintaining detailed audit logs of firmware update activities will significantly reduce the attack surface. Regular security assessments and vulnerability scanning should be conducted to identify any potential exploitation attempts, while ensuring that all devices receive timely firmware updates from trusted sources.