Description
A buffer overflow vulnerability exists in the Rockwell Automation select 1756-EN* communication devices. If exploited, a threat actor could potentially leverage this vulnerability to perform a remote code execution. To exploit this vulnerability, a threat actor would have to send a maliciously crafted CIP request to device.
EPSS Score:
9%
Comprehensive Technical Analysis of EUVD-2023-33768
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2023-33768 is a buffer overflow in Rockwell Automation's select 1756-EN* communication devices. This vulnerability allows for remote code execution (RCE) if exploited. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:
- Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
- Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required.
- Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
- Confidentiality (C): High (H) - Complete loss of confidentiality.
- Integrity (I): High (H) - Complete loss of integrity.
- Availability (A): High (H) - Complete loss of availability.
The EPSS (Exploit Prediction Scoring System) score of 9 suggests a high likelihood of exploitation in the wild.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves sending a maliciously crafted Common Industrial Protocol (CIP) request to the affected device. This can be done remotely over the network, making it a significant threat for any organization using these devices. The low complexity and lack of required privileges or user interaction make this vulnerability particularly dangerous.
Potential exploitation methods include:
- Network Scanning: Identifying vulnerable devices on the network.
- Crafted CIP Requests: Sending specially crafted CIP requests to trigger the buffer overflow.
- Automated Exploits: Using automated tools or scripts to exploit the vulnerability en masse.
3. Affected Systems and Software Versions
The vulnerability affects a wide range of Rockwell Automation 1756-EN* communication devices. The specific models and versions are listed below:
- 1756-EN3TR Series A: ≤5.008 & 5.028
- 1756-EN2TXT Series D: ≤11.002
- 1756-EN2TP Series A: ≤11.002
- 1756-EN2TRXT Series A, B: ≤5.008 & 5.028
- 1756-EN3TRK Series B: ≤11.002
- 1756-EN2TPXT Series A: ≤11.002
- 1756-EN2FK Series C: ≤11.002
- 1756-EN2TK Series A, B, C: ≤5.008 & 5.028
- 1756-EN2TRK Series C: ≤11.002
- 1756-EN2TPK Series A: ≤11.002
- 1756-EN2FK Series A, B: ≤5.008 & 5.028
- 1756-EN2F Series C: ≤11.002
- 1756-EN3TRK Series A: ≤5.008 & 5.028
- 1756-EN2T Series D: ≤11.002
- 1756-EN2T Series A, B, C: ≤5.008 & 5.028
- 1756-EN2TR Series C: ≤11.002
- 1756-EN3TR Series B: ≤11.003
- 1756-EN2TR Series A, B: ≤5.008 & 5.028
- 1756-EN2TRK Series A, B: ≤5.008 & 5.028
- 1756-EN2TXT Series A, B, C: ≤5.008 & 5.028
- 1756-EN2F Series A, B: ≤5.008 & 5.028
- 1756-EN2TRXT Series C: ≤11.002
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, organizations should consider the following strategies:
- Patch Management: Apply the latest firmware updates provided by Rockwell Automation.
- Network Segmentation: Isolate critical systems and devices from the broader network to limit exposure.
- Access Control: Implement strict access controls to limit who can interact with these devices.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for unusual network activity, particularly CIP requests.
- Regular Audits: Conduct regular security audits and vulnerability assessments.
- User Training: Educate staff on the importance of cybersecurity and the risks associated with this vulnerability.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to European industrial control systems (ICS) and operational technology (OT) environments. Given the critical nature of these systems, a successful exploit could lead to severe disruptions in manufacturing, energy, and other critical infrastructure sectors. The high CVSS score and EPSS score underscore the urgency for immediate action.
6. Technical Details for Security Professionals
- Detection: Implement network monitoring tools to detect anomalous CIP traffic.
- Response: Develop an incident response plan specific to this vulnerability, including steps for containment, eradication, and recovery.
- Prevention: Regularly update firmware and apply patches as soon as they are available. Use secure coding practices to prevent similar vulnerabilities in future developments.
- Compliance: Ensure compliance with relevant standards and regulations, such as ISO 27001 and NIS Directive, to maintain a robust cybersecurity posture.
Conclusion
EUVD-2023-33768 represents a critical vulnerability in Rockwell Automation's communication devices, posing a significant threat to industrial control systems. Immediate action, including patching, network segmentation, and enhanced monitoring, is essential to mitigate the risk. Organizations must remain vigilant and proactive in their cybersecurity measures to protect against potential exploits.
For further details, refer to the official Rockwell Automation advisory: Rockwell Automation Advisory.