EUVD-2025-4689

Comprehensive Technical Analysis of EUVD-2025-4689

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the TP-Link WR840N v6 router with firmware version 0.9.1 4.16 and earlier allows unauthorized individuals to bypass authentication for certain interfaces under the /cgi directory. This is achieved by adding a specific Referer header (Referer: http://tplinkwifi.net) to the request, which the router recognizes as passing the authentication.

Severity Evaluation:

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

The high base score of 9.8 indicates a critical vulnerability. The CVSS vector string breaks down as follows:

• 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)

This vulnerability poses a significant risk due to its ease of exploitation and the potential for severe impact on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: An attacker can exploit this vulnerability remotely over the network.
• Authentication Bypass: By adding the Referer: http://tplinkwifi.net header to HTTP requests, an attacker can bypass authentication mechanisms.

Exploitation Methods:

• Unauthorized Access: Attackers can gain unauthorized access to sensitive interfaces under the /cgi directory.
• Data Exfiltration: Attackers can potentially exfiltrate sensitive information, such as configuration settings and user credentials.
• Configuration Tampering: Attackers can modify router settings, leading to further compromise or disruption of network services.

3. Affected Systems and Software Versions

Affected Systems:

• TP-Link WR840N v6 router

Affected Software Versions:

• Firmware version 0.9.1 4.16 and earlier

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Upgrade the router firmware to a version that addresses this vulnerability.
• Network Segmentation: Isolate the router from critical network segments to limit potential damage.
• Access Control: Implement strict access controls and monitor network traffic for suspicious activities.

Long-Term Strategies:

• Regular Patching: Establish a routine for regularly updating firmware and software.
• Security Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for unauthorized access attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability in TP-Link WR840N v6 routers poses a significant threat to European cybersecurity, particularly for small businesses and home users who rely on these devices for network connectivity. The ease of exploitation and the potential for severe impact underscore the need for robust cybersecurity measures and awareness campaigns.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure that their network devices comply with GDPR regulations to protect personal data.
• Cybersecurity Directives: Adherence to EU cybersecurity directives and guidelines is crucial to mitigate such vulnerabilities.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2024-57050
• GHSA ID: GHSA-c5g7-7w25-772m
• EPSS Score: 36 (indicating a moderate likelihood of exploitation)

References:

• NVD Entry
• GitHub Repository

Technical Recommendations:

• Monitoring: Implement continuous monitoring for unusual network traffic patterns.
• Logging: Enable detailed logging on the router to capture and analyze suspicious activities.
• Incident Response: Develop an incident response plan to quickly address and mitigate any detected exploitation attempts.

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of unauthorized access and potential data breaches.