EUVD-2024-35288

Comprehensive Technical Analysis of EUVD-2024-35288

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-35288, also known as CVE-2024-35339, pertains to a command injection flaw in the Tenda FH1206 V1.2.0.8(8155) firmware. This vulnerability allows an attacker to inject arbitrary commands via the mac parameter in the ip/goform/WriteFacMac endpoint. The CVSS Base Score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through network access to the vulnerable endpoint. An attacker can exploit this vulnerability by crafting a malicious HTTP request to the ip/goform/WriteFacMac endpoint, injecting arbitrary commands through the mac parameter. This can lead to remote code execution (RCE), allowing the attacker to execute commands with the privileges of the web server process.

Potential exploitation methods include:

• Direct Network Access: An attacker with network access to the device can send crafted HTTP requests.
• Man-in-the-Middle (MitM) Attacks: An attacker intercepting network traffic can inject malicious requests.
• Phishing and Social Engineering: Tricking users into visiting malicious websites that exploit the vulnerability.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Tenda FH1206 V1.2.0.8(8155)

Other versions of the Tenda FH1206 firmware may also be affected, but this has not been confirmed. Users should verify the firmware version and apply updates as necessary.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Immediately update the firmware to a version that addresses this vulnerability.
• Network Segmentation: Isolate the device on a separate network segment to limit exposure.
• Access Control: Implement strict access controls to restrict network access to the device.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the vulnerable endpoint.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected Tenda FH1206 devices. Given the critical nature of the vulnerability, it could be exploited to compromise network security, leading to data breaches, unauthorized access, and potential disruption of services. The high EPSS score of 3 indicates a moderate likelihood of exploitation in the wild.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: ip/goform/WriteFacMac
• Parameter: mac
• Injection Type: Command Injection

Exploitation Example: An attacker could send a crafted HTTP request such as:

POST /goform/WriteFacMac HTTP/1.1
Host: <target_ip>
Content-Type: application/x-www-form-urlencoded

mac=`command`

Where command is the arbitrary command the attacker wishes to execute.

Detection:

• Log Analysis: Monitor logs for unusual or unexpected command execution.
• Network Traffic Analysis: Look for anomalous HTTP requests targeting the vulnerable endpoint.

Remediation:

• Patch Management: Ensure all devices are running the latest firmware.
• Configuration Hardening: Disable unnecessary services and harden device configurations.

Conclusion: The command injection vulnerability in Tenda FH1206 V1.2.0.8(8155) is critical and requires immediate attention. Organizations should prioritize updating affected devices and implementing robust security measures to mitigate the risk of exploitation. Regular monitoring and auditing are essential to maintain a secure cyber environment.