Taiwan-based Moxa has issued an advisory regarding two critical security vulnerabilities that impact a range of its network security appliances, including cellular routers and secure routers. These vulnerabilities, if exploited, could lead to privilege escalation and unauthorized command execution, posing significant risks to system integrity and data security, particularly in critical industries such as energy, transportation, and manufacturing. In these sectors, Moxa devices often serve as the backbone of operational technology (OT) networks, where any compromise could disrupt essential services or jeopardize safety systems.
Overview of Vulnerabilities
The vulnerabilities, identified as CVE-2024-9138 and CVE-2024-9140, were reported by cybersecurity researcher Lars Haulin. These flaws were uncovered during a targeted security assessment aimed at identifying weaknesses in network appliance firmware, showcasing the importance of proactive audits in preventing potential exploits. They carry high CVSS scores of 8.6 and 9.3, respectively, underlining their critical nature.
CVE-2024-9138
- Description: A hard-coded credentials vulnerability that allows authenticated users to escalate privileges. This could grant root-level access to the system.
- Potential Impact:
- Unauthorized modifications to system configurations.
- Exposure of sensitive data.
- Disruption of essential services.
- Full system compromise.
CVE-2024-9140
- Description: A flaw that allows attackers to bypass input restrictions by exploiting special characters. This could enable unauthorized command execution.
- Potential Impact:
- Execution of malicious commands.
- High risk of data theft or system manipulation.
Affected Products and Firmware Versions
These vulnerabilities impact multiple Moxa product lines. Below are the affected devices and firmware versions:
CVE-2024-9138
- EDR-810 Series: Firmware version 5.12.37 and earlier.
- EDR-8010 Series: Firmware version 3.13.1 and earlier.
- EDR-G902 Series: Firmware version 5.7.25 and earlier.
- EDR-G9004 Series: Firmware version 3.13.1 and earlier.
- EDR-G9010 Series: Firmware version 3.13.1 and earlier.
- EDF-G1002-BP Series: Firmware version 3.13.1 and earlier.
- NAT-102 Series: Firmware version 1.0.5 and earlier.
- OnCell G4302-LTE4 Series: Firmware version 3.13 and earlier.
- TN-4900 Series: Firmware version 3.13 and earlier.
CVE-2024-9140
- EDR-8010 Series: Firmware version 3.13.1 and earlier.
- EDR-G9004 Series: Firmware version 3.13.1 and earlier.
- EDR-G9010 Series: Firmware version 3.13.1 and earlier.
- EDF-G1002-BP Series: Firmware version 3.13.1 and earlier.
- NAT-102 Series: Firmware version 1.0.5 and earlier.
- OnCell G4302-LTE4 Series: Firmware version 3.13 and earlier.
- TN-4900 Series: Firmware version 3.13 and earlier.
Available Patches and Updates
Moxa has released patches for most of the affected products. Users are advised to take the following actions:
Firmware Updates
- Upgrade to version 3.14 or later for the following:
- EDR-810 Series
- EDR-8010 Series
- EDR-G902 Series
- EDR-G9004 Series
- EDR-G9010 Series
- EDF-G1002-BP Series
- For Specific Products:
- NAT-102 Series: No official patch is currently available.
- OnCell G4302-LTE4 Series: Contact Moxa Technical Support for updates.
- TN-4900 Series: Contact Moxa Technical Support for guidance.
Mitigation Strategies
For devices where patches are unavailable, or as an additional precaution, Moxa recommends the following measures:
- Network Isolation: Ensure devices are not exposed to the internet directly.
- Access Control: Restrict SSH access to trusted IP addresses and networks using:
- Firewall rules.
- TCP wrappers.
- Monitoring: Implement intrusion detection and prevention systems to identify and block exploitation attempts.
Technical Insights
Understanding the Risks
- Hard-coded credentials, as seen in CVE-2024-9138, are often overlooked during product development. A notable example is the Mirai botnet incident, where attackers exploited hard-coded credentials in IoT devices to build a massive botnet, demonstrating how such vulnerabilities can have widespread and devastating impacts. However, they pose a grave risk, allowing attackers to bypass standard authentication mechanisms and gain elevated privileges.
- CVE-2024-9140 demonstrates how inadequate input validation can be exploited to inject malicious commands. Such vulnerabilities are often leveraged in targeted attacks against critical infrastructure.
Implications
Moxa’s network appliances are widely used in industrial environments, including energy, transportation, and manufacturing. For instance, in the energy sector, these devices often manage remote monitoring of power grids, ensuring uninterrupted energy supply. In transportation, Moxa’s routers are critical in facilitating communication between traffic management systems, while in manufacturing, they play a vital role in connecting and securing industrial control systems to optimize production processes. Exploiting these vulnerabilities could result in severe operational disruptions, making patching and mitigation efforts crucial.
