CVE-2025-67135

Comprehensive Technical Analysis of CVE-2025-67135

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-67135 CISA Vulnerability Name: CVE-2025-67135 CVSS Score: 9.8

The vulnerability in question pertains to the PF-50 1.2 keyfob of the PGST PG107 Alarm System version 1.25.05.hf. The weak security mechanisms in the keyfob allow attackers to perform a code replay attack, thereby compromising the access control system.

Severity Evaluation:

• CVSS Score: 9.8 (Critical)
• Impact: High
• Exploitability: High

The high CVSS score indicates a critical vulnerability that can be easily exploited with severe consequences. The vulnerability allows unauthorized access to secured areas, posing significant risks to physical security and potentially leading to theft, unauthorized entry, and other malicious activities.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Code Replay Attack: An attacker can capture the keyfob's signal during a legitimate access attempt and replay it later to gain unauthorized access.
2. Man-in-the-Middle (MitM) Attack: An attacker can intercept and manipulate the communication between the keyfob and the alarm system.
3. Signal Jamming: An attacker can jam the legitimate signal and then replay a previously captured signal to gain access.

Exploitation Methods:

• Signal Capture: Using specialized hardware (e.g., software-defined radios) to capture the keyfob's signal.
• Signal Replay: Replaying the captured signal to the alarm system to gain unauthorized access.
• Protocol Analysis: Analyzing the communication protocol to identify weaknesses and exploit them for unauthorized access.

3. Affected Systems and Software Versions

Affected Systems:

• PGST PG107 Alarm System version 1.25.05.hf
• PF-50 1.2 keyfob

Software Versions:

• PG107 Alarm System firmware version 1.25.05.hf

4. Recommended Mitigation Strategies

1. Firmware Update: Immediately update the PG107 Alarm System to the latest firmware version that addresses this vulnerability.
2. Rolling Codes: Implement rolling code technology in the keyfob to ensure that each signal is unique and cannot be replayed.
3. Encryption: Use strong encryption for communication between the keyfob and the alarm system.
4. Signal Jamming Detection: Implement mechanisms to detect and alert on signal jamming attempts.
5. Access Control Monitoring: Continuously monitor access control logs for any suspicious activities or unauthorized access attempts.
6. Physical Security Measures: Enhance physical security measures to complement the electronic access control system.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the importance of robust security measures in IoT devices, particularly those used for physical security. It underscores the need for:

• Regular Security Audits: Conducting regular security audits and penetration testing of IoT devices.
• Secure Development Practices: Implementing secure development practices to prevent such vulnerabilities.
• User Awareness: Educating users about the risks and best practices for using IoT devices.

6. Technical Details for Security Professionals

Technical Analysis:

• Communication Protocol: The keyfob uses a fixed code for communication, making it susceptible to replay attacks.
• Signal Capture: The signal can be captured using readily available hardware and software tools.
• Exploitation: The captured signal can be replayed to the alarm system, bypassing the access control mechanism.

Mitigation Implementation:

• Rolling Codes: Implement a rolling code algorithm where the keyfob and the alarm system synchronize on a unique code for each access attempt.
• Encryption: Use AES-256 encryption for communication between the keyfob and the alarm system.
• Firmware Update: Ensure that the firmware update process is secure and verifies the integrity of the update.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities.
• Incident Response Plan: Develop and implement an incident response plan to address any unauthorized access attempts promptly.

Conclusion: CVE-2025-67135 represents a critical vulnerability in the PGST PG107 Alarm System that can be exploited to compromise physical security. Immediate mitigation strategies, including firmware updates, rolling codes, and encryption, are essential to protect against unauthorized access. The cybersecurity landscape must adapt to the increasing threats posed by vulnerabilities in IoT devices, emphasizing the need for robust security measures and continuous monitoring.