CVE-2025-44877

Comprehensive Technical Analysis of CVE-2025-44877

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-44877 CISA Vulnerability Name: CVE-2025-44877 CVSS Score: 9.8

The vulnerability in question is a command injection flaw in the formSetSambaConf function of Tenda AC9 V15.03.06.42_multi, specifically via the usbname parameter. This vulnerability allows attackers to execute arbitrary commands on the affected device by crafting a malicious request. The CVSS score of 9.8 indicates a critical severity level, highlighting the potential for significant impact if exploited.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker could exploit this vulnerability over the network by sending a specially crafted HTTP request to the vulnerable endpoint.
• Local Attacks: If an attacker has local access to the device, they could also exploit this vulnerability to execute arbitrary commands.

Exploitation Methods:

• Command Injection: The attacker can inject malicious commands into the usbname parameter, which are then executed by the device.
• Remote Code Execution (RCE): By injecting commands, the attacker can achieve remote code execution, potentially leading to full control over the device.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC9 routers running firmware version V15.03.06.42_multi.

Software Versions:

• Specifically, the vulnerability is present in the formSetSambaConf function of the firmware version V15.03.06.42_multi.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Users should immediately update their Tenda AC9 routers to the latest firmware version that addresses this vulnerability.
• Network Segmentation: Isolate the affected devices from critical network segments to limit potential damage.
• Access Control: Implement strict access controls to limit who can access the device's management interface.

Long-Term Strategies:

• Regular Patching: Establish a regular patching and update schedule for all network devices.
• Monitoring and Logging: Implement robust monitoring and logging to detect and respond to any suspicious activities.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential risks.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability underscores the importance of securing IoT devices, which are increasingly becoming targets for cyberattacks. The high CVSS score indicates the potential for severe consequences, including data breaches, unauthorized access, and disruption of services. This vulnerability serves as a reminder for organizations to prioritize the security of all networked devices, not just traditional endpoints.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: formSetSambaConf
• Parameter: usbname
• Exploit Mechanism: The usbname parameter is not properly sanitized, allowing for command injection.

Exploit Example:

POST /formSetSambaConf HTTP/1.1
Host: 192.168.1.1
Content-Type: application/x-www-form-urlencoded

usbname=test;rm -rf /

In this example, the usbname parameter is used to inject a command that deletes all files in the root directory.

Detection and Response:

• Intrusion Detection Systems (IDS): Configure IDS to detect and alert on suspicious traffic patterns targeting the formSetSambaConf endpoint.
• Incident Response: Develop an incident response plan that includes steps for isolating affected devices, analyzing logs, and remediating the vulnerability.

References:

• Exploit and Third Party Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their network infrastructure.