CVE-2026-24105

Comprehensive Technical Analysis of CVE-2026-24105

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-24105 CVSS Score: 9.8

The vulnerability in question is a command injection flaw in the goform/formsetUsbUnload function of Tenda AC15V1.0 firmware version V15.03.05.18_multi. The issue arises because the value of v1 is not properly validated, which can lead to arbitrary command execution if an attacker injects malicious input into the doSystemCmd function.

Severity Evaluation:

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

The high CVSS score indicates that this vulnerability is critical and poses a significant risk to affected systems. The lack of input validation allows for command injection, which can result in full system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker could exploit this vulnerability remotely if the affected device is exposed to the internet.
• Local Network Attacks: An attacker with access to the local network could exploit this vulnerability to gain control over the device.

Exploitation Methods:

• Command Injection: By crafting a specially designed request to the goform/formsetUsbUnload endpoint, an attacker can inject arbitrary commands that will be executed by the system.
• Payload Delivery: The attacker can deliver payloads that perform various malicious actions, such as installing backdoors, exfiltrating data, or disrupting network operations.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC15V1.0 devices running firmware version V15.03.05.18_multi.

Software Versions:

• Tenda AC15V1.0 firmware V15.03.05.18_multi.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate affected devices from critical network segments to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the affected endpoint.
• Monitoring: Increase monitoring of network traffic to and from affected devices to detect any suspicious activity.

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware update from Tenda once it becomes available.
• Input Validation: Ensure that all input is properly validated and sanitized to prevent command injection attacks.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the importance of robust input validation and secure coding practices. It underscores the need for continuous monitoring and timely patching of IoT devices, which are increasingly becoming targets for cyber attacks. The high CVSS score indicates the potential for severe impact, including data breaches, unauthorized access, and disruption of services.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: goform/formsetUsbUnload
• Affected Parameter: v1
• Issue: Lack of input validation leading to command injection.

Exploitation Steps:

1. Identify Target: Locate a Tenda AC15V1.0 device running the vulnerable firmware version.
2. Craft Payload: Create a malicious payload that injects commands into the doSystemCmd function.
3. Send Request: Send the crafted request to the goform/formsetUsbUnload endpoint.
4. Execute Commands: The injected commands will be executed by the system, leading to potential compromise.

Detection and Response:

• Log Analysis: Review system logs for any unusual command executions or unexpected behavior.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network activity.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

References:

• GitHub Repository
• Tenda Official Notice

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.