Severity: HIGH
Description: The session hijacking attack targets the application layer's control mechanism, which manages authenticated sessions between a host PC and a PLC. During such sessions, a session key is utilized to maintain security. However, if an attacker captures this session key, they can inject traffic into an ongoing authenticated session. To successfully achieve this, the attacker also needs to spoof both the IP address and MAC address of the originating host which is typical of a session-based attack.
CVSS Score: 8.8
B
No data available.
No data available.
1. Risk Assessment
The vulnerability identified as CVE-2024-43099 is a high-risk issue with a CVSS base score of 8.8. It involves an authentication bypass via capture-replay attack, targeting the session control mechanism between a host PC and a Programmable Logic Controller (PLC). The attack exploits the session key used to maintain authenticated sessions, allowing an attacker to inject malicious traffic into an ongoing session. This requires the attacker to spoof both the IP and MAC addresses of the originating host, which is feasible in adjacent network scenarios.
The likelihood of exploitation is moderate due to the need for network adjacency and the ability to spoof addresses, but the ease of exploitation is high once these conditions are met. The impact on confidentiality, integrity, and availability is severe, as an attacker could gain unauthorized access, manipulate critical systems, and disrupt operations. This vulnerability poses a significant risk to industrial control systems, particularly in environments where PLCs are used for critical infrastructure.
2. Potential Attack Scenarios
An attacker could exploit this vulnerability in an industrial setting where a host PC communicates with a PLC over a local network. The attacker would first gain access to the adjacent network, possibly through a compromised device or physical access. They would then use network sniffing tools to capture the session key during an authenticated session between the host PC and the PLC.
Once the session key is captured, the attacker spoofs the IP and MAC addresses of the host PC to impersonate it. They inject malicious commands into the session, such as altering PLC configurations, disrupting operations, or exfiltrating sensitive data. The potential outcomes include operational downtime, safety risks, and unauthorized access to critical systems, leading to significant financial and reputational damage for the affected organization.
3. Mitigation Recommendations
To mitigate this vulnerability, organizations should take the following actions:
- Upgrade to the BRX platform: AutomationDirect recommends transitioning to the BRX platform, which is designed to meet current security standards and is actively maintained. This is the most effective long-term solution.
- Implement network segmentation and air gapping: Isolate the affected H2-DM1E devices from the broader network to reduce exposure to external threats. This limits the attack surface and minimizes the impact of potential exploits.
- Deploy a StrideLinx secure VPN platform: Placing the system behind a secure VPN adds an additional layer of protection, making it harder for attackers to intercept session keys or spoof network addresses.
- Monitor network traffic: Use intrusion detection systems (IDS) and network monitoring tools to detect unusual activity, such as IP or MAC address spoofing, and respond promptly to potential threats.
For further details and support, organizations can contact AutomationDirect at https://www.automationdirect.com/adc/contactus/contactus.
4. Executive Summary
CVE-2024-43099 is a high-severity vulnerability affecting the AutomationDirect DirectLogic H2-DM1E PLC. It allows attackers to bypass authentication and inject malicious traffic into ongoing sessions, potentially leading to unauthorized access, operational disruption, and safety risks. The vulnerability is particularly concerning for industrial environments where PLCs are used in critical infrastructure.
The risk of exploitation is significant, especially in adjacent network scenarios, and the potential impacts on confidentiality, integrity, and availability are severe. Immediate action is required to mitigate this vulnerability. AutomationDirect recommends upgrading to the BRX platform, implementing network segmentation, and deploying a secure VPN. These measures will help protect critical systems and reduce the risk of exploitation.
Addressing this vulnerability is crucial to safeguarding operations, ensuring safety, and maintaining business continuity. Organizations should prioritize these mitigation steps to protect their systems and minimize potential damage.
Severity: HIGH
Description: The H2-DM1E PLC's authentication protocol appears to utilize either a custom encoding scheme or a challenge-response protocol. However, there's an observed anomaly in the H2-DM1E PLC's protocol execution, namely its acceptance of multiple distinct packets as valid authentication responses. This behavior deviates from standard security practices where a single, specific response or encoding pattern is expected for successful authentication.
CVSS Score: 8.8
B
No data available.
No data available.
1. Risk Assessment
The vulnerability identified in the H2-DM1E PLC's authentication protocol (CVE-2024-45368) poses a significant risk due to its high CVSS score of 8.8. The flaw lies in the protocol's acceptance of multiple distinct packets as valid authentication responses, deviating from standard security practices that require a single, specific response. This anomaly allows attackers to bypass authentication mechanisms with relative ease, as the attack complexity is low and no privileges are required.
The likelihood of exploitation is moderate, given the adjacent network attack vector, which means an attacker must have access to the same network segment as the target device. However, the ease of exploitation is high due to the low complexity of the attack. The potential impacts are severe, with high risks to confidentiality, integrity, and availability. Attackers could gain unauthorized access to the PLC, manipulate its operations, disrupt industrial processes, or exfiltrate sensitive data.
Business impacts include operational downtime, financial losses, reputational damage, and potential safety risks in industrial environments. The vulnerability is particularly concerning for organizations relying on the H2-DM1E PLC in critical infrastructure or manufacturing processes.
2. Potential Attack Scenarios
An attacker on the same network segment as the H2-DM1E PLC could exploit this vulnerability by sending multiple crafted packets to the device during the authentication process. Since the PLC accepts multiple distinct packets as valid responses, the attacker could brute-force or guess the correct packet format to bypass authentication.
Once authenticated, the attacker could gain full control over the PLC, allowing them to modify its programming, disrupt operations, or exfiltrate sensitive data. For example, in a manufacturing environment, the attacker could alter production parameters, causing defective products or halting production entirely. In a critical infrastructure setting, such as water treatment or energy distribution, the attacker could manipulate control systems, leading to service outages or safety hazards.
The potential outcomes include operational disruption, financial losses, safety risks, and compromised data integrity. The attack could also serve as a foothold for further exploitation within the network, enabling lateral movement to other systems.
3. Mitigation Recommendations
Immediate actions should be taken to mitigate the risks associated with this vulnerability. AutomationDirect recommends upgrading to the BRX platform, which is designed to meet current security standards and is actively maintained. This transition addresses the inherent architectural limitations of the H2-DM1E PLC.
For organizations unable to upgrade immediately, implementing network segmentation and air gapping is strongly advised. This strategy isolates the H2-DM1E PLC from the broader network, reducing its exposure to external threats. Additionally, deploying a StrideLinx secure VPN platform can provide an additional layer of security by encrypting communications to and from the PLC.
Organizations should also monitor network traffic for unusual patterns or unauthorized access attempts. Regular security assessments and penetration testing can help identify and address potential vulnerabilities in the network.
For further details and support, contact AutomationDirect at https://www.automationdirect.com/adc/contactus/contactus.
4. Executive Summary
CVE-2024-45368 is a high-severity vulnerability affecting the H2-DM1E PLC's authentication protocol, allowing attackers to bypass authentication and gain unauthorized access. This flaw poses significant risks to operational continuity, data integrity, and safety in industrial environments.
The vulnerability is relatively easy to exploit, with potential impacts including operational disruption, financial losses, and reputational damage. Attackers could manipulate PLC operations, disrupt critical processes, or exfiltrate sensitive data.
To mitigate these risks, AutomationDirect recommends upgrading to the BRX platform, implementing network segmentation, and deploying a secure VPN solution. These measures provide a comprehensive approach to managing the risks associated with the H2-DM1E PLC while preparing for future security needs.
Addressing this vulnerability is critical to safeguarding industrial operations and ensuring business continuity. Organizations should act promptly to implement the recommended mitigation strategies and reduce their exposure to potential attacks.