CVE-2025-11418

Comprehensive Technical Analysis of CVE-2025-11418

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-11418 CVSS Score: 9.8

The vulnerability in question is a stack-based buffer overflow in the Tenda CH22 device, specifically affecting the function formWrlsafeset within the file /goform/AdvSetWrlsafeset of the HTTP Request Handler component. The severity of this vulnerability is rated at 9.8 on the CVSS scale, indicating a critical risk. This high score is due to the potential for remote exploitation, which can lead to severe impacts such as arbitrary code execution, denial of service, or unauthorized access to sensitive information.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited remotely, meaning an attacker does not need physical access to the device.
• Network-Based Attacks: Given that the vulnerability resides in the HTTP Request Handler, attackers can craft malicious HTTP requests to trigger the buffer overflow.

Exploitation Methods:

• Manipulation of mit_ssid_index Argument: By sending specially crafted HTTP requests that manipulate the mit_ssid_index argument, an attacker can cause a stack-based buffer overflow.
• Payload Delivery: Once the buffer overflow is triggered, an attacker can inject malicious payloads to execute arbitrary code on the device.

3. Affected Systems and Software Versions

Affected Device: Tenda CH22 Affected Software Versions: Up to version 1.0.0.1

All Tenda CH22 devices running firmware versions up to 1.0.0.1 are vulnerable to this issue. Users and administrators should prioritize updating their devices to a patched version as soon as it becomes available.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Apply the latest firmware update provided by Tenda as soon as it is released.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the device's HTTP interface.

Long-Term Strategies:

• Regular Patch Management: Establish a regular patch management process to ensure all devices are updated promptly.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the HTTP interface.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on Cybersecurity Landscape

The disclosure of this vulnerability highlights the ongoing challenge of securing IoT devices, which are often deployed in large numbers and can be difficult to update. The potential for remote exploitation and the critical nature of the vulnerability underscore the need for robust security practices in device manufacturing and deployment. This incident serves as a reminder for organizations to prioritize security in their IoT deployments and to implement comprehensive security measures to protect against such vulnerabilities.

6. Technical Details for Security Professionals

Vulnerability Details:

• Component: HTTP Request Handler
• Function: formWrlsafeset
• File: /goform/AdvSetWrlsafeset
• Vulnerable Argument: mit_ssid_index

Exploitation Steps:

1. Identify Target: Locate Tenda CH22 devices on the network.
2. Craft Malicious Request: Create an HTTP request that manipulates the mit_ssid_index argument to trigger the buffer overflow.
3. Deliver Payload: Inject a malicious payload into the request to achieve arbitrary code execution.

Detection and Monitoring:

• Log Analysis: Monitor HTTP request logs for unusual patterns or requests targeting the /goform/AdvSetWrlsafeset endpoint.
• Anomaly Detection: Use anomaly detection tools to identify abnormal network traffic patterns that may indicate an exploitation attempt.

Incident Response:

• Containment: Isolate affected devices immediately to prevent further exploitation.
• Forensic Analysis: Conduct a forensic analysis to determine the extent of the compromise and identify any malicious activities.
• Remediation: Apply the latest firmware update and implement additional security controls to prevent future incidents.

By following these recommendations and maintaining a proactive security posture, organizations can effectively mitigate the risks associated with CVE-2025-11418 and similar vulnerabilities.