EUVD-2023-28086

Comprehensive Technical Analysis of EUVD-2023-28086

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2023-28086 pertains to hardcoded credentials in Baicells Nova 227, Nova 233, and Nova 243 LTE TDD eNodeB devices running firmware versions up to RTS/RTD 3.7.11.3. These credentials are stored in the firmware and encrypted using the crypt function, which is relatively weak and easily discoverable. The severity of this vulnerability is rated with a CVSS Base Score of 10.0, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Complexity): The attack requires low skill or resources.
• PR:N (No Privileges Required): No privileges are required to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required.
• S:C (Changed Scope): The vulnerability can affect resources beyond the security scope managed by the security authority.
• C:H (High Confidentiality Impact): There is a high impact on confidentiality.
• I:H (High Integrity Impact): There is a high impact on integrity.
• A:L (Low Availability Impact): There is a low impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote SSH Access: Attackers can use the hardcoded credentials to gain unauthorized access to the devices via SSH.
• Network Scanning: Attackers can scan the network for vulnerable devices and attempt to authenticate using the known credentials.

Exploitation Methods:

• Credential Extraction: Attackers can extract the hardcoded credentials from the firmware using reverse engineering techniques.
• Automated Scripts: Attackers can use automated scripts to scan for vulnerable devices and attempt to log in using the hardcoded credentials.

3. Affected Systems and Software Versions

Affected Devices:

• Baicells Nova 227
• Baicells Nova 233
• Baicells Nova 243

Affected Firmware Versions:

• All firmware versions up to and including RTS/RTD 3.7.11.3

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Upgrade to the latest firmware version (RTS/RTD 3.7.11.6 or higher) that addresses the vulnerability.
• Credential Management: Change default credentials to strong, unique passwords.
• Network Segmentation: Implement network segmentation to limit access to critical devices.
• Monitoring: Enable logging and monitoring for unauthorized access attempts.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Patch Management: Implement a robust patch management program to ensure timely updates.
• Access Control: Enforce strict access control policies and use multi-factor authentication (MFA) where possible.

5. Impact on European Cybersecurity Landscape

The presence of hardcoded credentials in widely used LTE TDD eNodeB devices poses a significant risk to the European cybersecurity landscape. These devices are critical for telecommunications infrastructure, and unauthorized access can lead to data breaches, service disruptions, and potential espionage. The vulnerability underscores the need for stringent security practices in the development and deployment of telecommunications equipment.

6. Technical Details for Security Professionals

Firmware Analysis:

• Encryption Method: The credentials are encrypted using the crypt function, which is known to be weak and easily reversible.
• Firmware Extraction: Security professionals can use tools like Binwalk and Ghidra to extract and analyze the firmware for hardcoded credentials.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect unusual SSH login attempts.
• Log Analysis: Regularly review SSH logs for unauthorized access attempts.
• Incident Response: Have an incident response plan in place to quickly address any detected breaches.

References:

• Baicells Firmware Update
• Baicells Changelog
• Baicells Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of unauthorized access and ensure the integrity and availability of their telecommunications infrastructure.