EUVD-2024-30171

Comprehensive Technical Analysis of EUVD-2024-30171

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the TOTOLINK X5000R V9.1.0cu.2350_B20230313 firmware involves a command injection flaw via the 'port' parameter in the setSSServer function located at /cgi-bin/cstecgi.cgi. This vulnerability allows an attacker to execute arbitrary commands on the affected device, potentially leading to full system compromise.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS:3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Command Execution: An attacker can exploit this vulnerability by sending a specially crafted request to the setSSServer function, injecting malicious commands through the 'port' parameter.
• Network-Based Attacks: Given the network attack vector, the vulnerability can be exploited over the internet, making it accessible to a wide range of potential attackers.

Exploitation Methods:

• Command Injection: By manipulating the 'port' parameter, an attacker can inject commands that the device will execute with the privileges of the web server process.
• Automated Scripts: Attackers can use automated scripts to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

• TOTOLINK X5000R routers running firmware version V9.1.0cu.2350_B20230313.

Software Versions:

• Firmware version V9.1.0cu.2350_B20230313 is explicitly mentioned as vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Users should immediately update to a patched firmware version if available.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the device's web interface.

Long-Term Strategies:

• Regular Patching: Ensure that all devices are regularly updated with the latest firmware.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity targeting the vulnerable endpoint.
• Security Audits: Conduct regular security audits to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using TOTOLINK X5000R routers. The potential for remote command execution can lead to widespread compromise, data breaches, and disruption of services. Given the critical nature of the vulnerability, it is essential for European cybersecurity authorities to issue advisories and ensure that affected parties take immediate action.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: setSSServer
• Parameter: 'port'
• Location: /cgi-bin/cstecgi.cgi

Exploitation Steps:

1. Identify Target: Scan for devices running the vulnerable firmware version.
2. Craft Payload: Create a payload that injects malicious commands through the 'port' parameter.
3. Send Request: Send the crafted request to the device's web interface.
4. Execute Commands: The device executes the injected commands, leading to potential system compromise.

Detection and Monitoring:

• Log Analysis: Monitor web server logs for unusual activity related to the setSSServer function.
• Network Traffic: Use network monitoring tools to detect suspicious traffic patterns targeting the vulnerable endpoint.

References:

• TOTOLINK Official Website
• GitHub Repository

Aliases:

• CVE-2024-32353
• GSD-2024-32353

Assigner:

• Mitre

EPSS Score:

• 6 (indicating a moderate likelihood of exploitation)

ENISA ID:

• Product: n/a
• Vendor: n/a

By addressing this vulnerability promptly and effectively, organizations can mitigate the risk of exploitation and protect their networks from potential attacks.