EUVD-2025-4496

Comprehensive Technical Analysis of EUVD-2025-4496

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2025-4496 pertains to a command injection flaw in the Tenda AC10 V1.0 router, specifically in the formexeCommand function. This vulnerability allows an attacker to execute arbitrary commands on the affected device by manipulating the cmdinput parameter in a POST request. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates that the vulnerability can be exploited remotely (AV:N), requires low complexity (AC:L), does not require any privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through a malicious POST request to the affected router. An attacker can craft a request that includes a specially designed cmdinput parameter, which is then processed by the formexeCommand function. This parameter is directly used in the doSystemCmd function without proper sanitization, leading to arbitrary command execution.

Exploitation Methods:

• Remote Command Execution: An attacker can send a POST request with a payload that includes malicious commands, which will be executed on the router.
• Privilege Escalation: If the router has elevated privileges, the attacker can execute commands with those privileges, potentially gaining full control over the device.
• Data Exfiltration: The attacker can use the command injection to exfiltrate sensitive data from the router, such as configuration files or network traffic.

3. Affected Systems and Software Versions

The vulnerability specifically affects Tenda AC10 V1.0 routers running firmware version V15.03.06.23. It is crucial to note that other versions of the firmware or other Tenda models may also be affected if they share similar codebases or functionalities.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Users should immediately update their Tenda AC10 V1.0 routers to the latest firmware version provided by the vendor, which should include a patch for this vulnerability.
• Network Segmentation: Isolate the router from critical network segments to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.

Long-Term Mitigation:

• Regular Patching: Establish a regular patching schedule to ensure that all network devices are up-to-date with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of Tenda routers in both residential and small business environments. The critical nature of the vulnerability means that successful exploitation could lead to widespread compromise of network security, data breaches, and potential disruption of services. This underscores the importance of timely patching and proactive security measures to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: formexeCommand
• Vulnerable Parameter: cmdinput
• Execution Path: The cmdinput parameter is received via a POST request and assigned to the str variable, which is then used in the cmd_buf variable. The cmd_buf variable is passed to the doSystemCmd function, leading to command injection.

Code Snippet Analysis:

void formexeCommand(char *cmdinput) {
    char str[256];
    char cmd_buf[256];
    strcpy(str, cmdinput);
    strcpy(cmd_buf, str);
    doSystemCmd(cmd_buf);
}

• Issue: The strcpy function copies the cmdinput parameter directly into cmd_buf without any validation or sanitization, allowing for command injection.

Mitigation Code Example:

void formexeCommand(char *cmdinput) {
    char str[256];
    char cmd_buf[256];
    if (validateInput(cmdinput)) {
        strcpy(str, cmdinput);
        strcpy(cmd_buf, str);
        doSystemCmd(cmd_buf);
    } else {
        // Handle invalid input
    }
}

bool validateInput(char *input) {
    // Implement input validation logic to sanitize and validate the input
    // Return true if input is valid, false otherwise
}

References:

• NVD Entry
• GitHub Analysis

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