Description
A command injection vulnerability in the telnet service of Adtran 411 ONT L80.00.0011.M2 allows attackers to escalate privileges to root and execute arbitrary commands.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-8765
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2025-8765, also known as CVE-2025-22939, is a command injection vulnerability affecting the telnet service of Adtran 411 ONT L80.00.0011.M2. This vulnerability allows attackers to escalate privileges to root and execute arbitrary commands. 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:
- AV:N - Attack Vector: Network
- AC:L - Attack Complexity: Low
- PR:N - Privileges Required: None
- UI:N - User Interaction: None
- S:U - Scope: Unchanged
- C:H - Confidentiality: High
- I:H - Integrity: High
- A:H - Availability: High
This high score reflects the ease of exploitation and the significant impact on confidentiality, integrity, and availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector is through the telnet service, which is known for its lack of encryption and weak authentication mechanisms. An attacker could exploit this vulnerability by:
- Network Scanning: Identifying devices with the vulnerable telnet service.
- Command Injection: Sending crafted telnet commands to escalate privileges and execute arbitrary commands.
- Automated Scripts: Using automated scripts to scan for vulnerable devices and exploit them en masse.
Given the low complexity and lack of required privileges, this vulnerability can be easily exploited by even moderately skilled attackers.
3. Affected Systems and Software Versions
The vulnerability specifically affects:
- Device: Adtran 411 ONT
- Firmware Version: L80.00.0011.M2
It is crucial to identify all instances of this device and firmware version within the network to assess the scope of the vulnerability.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Firmware Update: Immediately update the firmware to a patched version provided by Adtran.
- Disable Telnet: If possible, disable the telnet service and use more secure alternatives like SSH.
- Network Segmentation: Implement network segmentation to isolate vulnerable devices from critical systems.
- Access Control: Enforce strict access controls and monitor for unauthorized access attempts.
- Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity related to telnet services.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues.
5. Impact on European Cybersecurity Landscape
The presence of this vulnerability in a widely used device like the Adtran 411 ONT poses a significant risk to the European cybersecurity landscape. Organizations relying on this device for network operations, especially in critical infrastructure sectors, are at high risk of compromise. The potential for widespread exploitation could lead to data breaches, service disruptions, and other severe consequences.
6. Technical Details for Security Professionals
For security professionals, the following technical details are essential:
- Detection: Use network monitoring tools to detect unusual telnet activity. Look for patterns indicative of command injection attempts.
- Exploitation: Understand that the exploitation involves sending specially crafted telnet commands that can bypass authentication and escalate privileges.
- Patch Management: Ensure that a robust patch management process is in place to quickly apply updates from Adtran.
- Incident Response: Prepare an incident response plan that includes steps for identifying compromised devices, isolating them, and restoring services.
- Logging and Monitoring: Implement comprehensive logging and monitoring to detect and respond to any exploitation attempts promptly.
Conclusion
EUVD-2025-8765 is a critical vulnerability that requires immediate attention from cybersecurity professionals. By understanding the attack vectors, affected systems, and recommended mitigation strategies, organizations can significantly reduce the risk of exploitation. Regular updates, strict access controls, and continuous monitoring are key to maintaining a secure network environment.