CVE-2025-25632

Comprehensive Technical Analysis of CVE-2025-25632

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-25632 CISA Vulnerability Name: CVE-2025-25632 Description: Tenda AC15 v15.03.05.19 is vulnerable to Command Injection via the handler function in /goform/telnet. CVSS Score: 9.8

The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for complete system compromise, including the execution of arbitrary commands with elevated privileges. The vulnerability allows an attacker to inject malicious commands into the system, leading to unauthorized access, data breaches, and potential takeover of the device.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker can exploit this vulnerability over the network by sending crafted requests to the /goform/telnet endpoint.
• Local Attacks: If an attacker has local access to the device, they can exploit the vulnerability to gain elevated privileges.

Exploitation Methods:

• Command Injection: The attacker can inject arbitrary commands into the handler function, which processes input without proper sanitization.
• Remote Code Execution (RCE): By injecting commands, the attacker can execute arbitrary code on the device, leading to full control over the system.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC15 routers running firmware version v15.03.05.19.

Software Versions:

• The vulnerability specifically affects Tenda AC15 v15.03.05.19. Other versions may also be affected but have not been explicitly mentioned in the CVE details.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Upgrade to the latest firmware version provided by Tenda, which includes patches for this vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact of an exploit.
• Access Control: Restrict access to the /goform/telnet endpoint to trusted IP addresses only.

Long-Term Strategies:

• Regular Patching: Implement a regular patching schedule to ensure all devices are running the latest firmware.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity and potential exploitation attempts.
• Security Audits: Conduct regular security audits to identify and mitigate similar vulnerabilities.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the ongoing risks associated with IoT devices, particularly routers, which are often targeted due to their critical role in network infrastructure. The high CVSS score underscores the potential for severe impacts, including data breaches, unauthorized access, and network compromise. This vulnerability serves as a reminder of the importance of robust security practices, including regular updates and proactive monitoring.

6. Technical Details for Security Professionals

Vulnerability Details:

• Handler Function: The vulnerability resides in the handler function within the /goform/telnet endpoint. This function processes input without proper sanitization, allowing for command injection.
• Exploit Code: The exploit involves crafting a request that includes malicious commands, which are then executed by the handler function.

Detection and Response:

• Log Analysis: Monitor logs for unusual activity related to the /goform/telnet endpoint. Look for patterns indicative of command injection attempts.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous behavior that may indicate an exploitation attempt.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts. This includes isolating affected devices, patching vulnerabilities, and conducting a thorough investigation to determine the extent of the compromise.

References:

• Exploit and Third Party Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with CVE-2025-25632 and enhance their overall cybersecurity posture.