NPort 5000 Series Firmware Improper Validation of Integrity Check Vulnerability

Vulnerability

The vulnerability is an improper validation of integrity check in the firmware update/upgrade process of all firmware versions for the NPort 5000 Series [1]. Affected product lines include NPort 5000AI-M12, 5100 (5130/5150 and 5110 models), 5100A, 5200, 5200A, 5410/5430 (Rev 3.2 and later) and 5450 (all Rev), 5410/5430 (Rev 2.x and prior), 5600, 5600-DT, IA5000 (hardware version 2.0 and later and 1.x), IA5000A (IA5450A and IA5150A/IA5250A), IA5000A-I/O, IAW5000A-I/O, and P5150A Series.

Exploitation

An attacker with network access to the device can exploit the lack of integrity verification to deliver a malicious firmware image. The exact preconditions are not detailed but likely require the ability to interact with the firmware update mechanism, possibly without authentication if the interface is exposed.

Impact

Successful exploitation allows an attacker to manipulate the firmware, leading to full control of the device. This compromises the integrity and availability of the device and may lead to information disclosure if the device processes sensitive data.

Mitigation

No firmware fix is available due to design restrictions. Moxa recommends following the CISA guidelines: reduce network exposure, place devices behind firewalls, isolate control system networks from business networks, and use secure remote access methods when necessary [1].