EUVD-2024-33345

Comprehensive Technical Analysis of EUVD-2024-33345

1. Vulnerability Assessment and Severity Evaluation

Vulnerability ID: EUVD-2024-33345 (CVE-2024-10915)

Description: The vulnerability affects D-Link NAS devices (DNS-320, DNS-320LW, DNS-325, and DNS-340L) up to version 20241028. The issue resides in the cgi_user_add function of the /cgi-bin/account_mgr.cgi?cmd=cgi_user_add file, where the manipulation of the group argument leads to OS command injection.

Severity: The vulnerability is rated as critical with a CVSS base score of 9.2. The high severity is due to the potential for remote exploitation, high impact on confidentiality, integrity, and availability, and the public disclosure of the exploit.

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

• AV:N - Attack Vector: Network
• AC:H - Attack Complexity: High
• AT:N - Attack Technique: Network
• PR:N - Privileges Required: None
• UI:N - User Interaction: None
• VC:H - Confidentiality Impact: High
• VI:H - Integrity Impact: High
• VA:H - Availability Impact: High
• SC:N - Scope Change: None
• SI:N - Secondary Impact: None
• SA:N - Secondary Availability: None

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited remotely, making it a significant threat.
• Command Injection: The manipulation of the group argument in the cgi_user_add function allows an attacker to inject arbitrary OS commands.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can send specially crafted HTTP requests to the vulnerable endpoint (/cgi-bin/account_mgr.cgi?cmd=cgi_user_add) with malicious input in the group parameter.
• Automated Scripts: Given the public disclosure, automated scripts or bots could be used to scan for and exploit vulnerable devices.

3. Affected Systems and Software Versions

Affected Devices:

• D-Link DNS-320
• D-Link DNS-320LW
• D-Link DNS-325
• D-Link DNS-340L

Affected Versions:

• All versions up to 20241028

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the latest firmware updates provided by D-Link.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable endpoint.
• Monitoring: Increase monitoring for suspicious activities targeting the affected devices.

Long-Term Strategies:

• Regular Updates: Ensure regular updates and patches are applied to all network devices.
• Security Audits: Conduct regular security audits and vulnerability assessments.
• User Training: Educate users on the risks and best practices for network security.

5. Impact on European Cybersecurity Landscape

Implications:

• Widespread Use: D-Link NAS devices are widely used in both home and business environments, increasing the potential impact.
• Critical Infrastructure: If exploited, this vulnerability could affect critical infrastructure, leading to data breaches, service disruptions, and financial losses.
• Regulatory Compliance: Organizations must ensure compliance with EU regulations such as GDPR, which mandates the protection of personal data.

6. Technical Details for Security Professionals

Exploit Details:

• Vulnerable Endpoint: /cgi-bin/account_mgr.cgi?cmd=cgi_user_add
• Vulnerable Parameter: group
• Injection Point: The group parameter is not properly sanitized, allowing for OS command injection.

Detection Methods:

• Log Analysis: Monitor logs for unusual activity related to the account_mgr.cgi endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious traffic patterns.
• Behavioral Analysis: Use behavioral analysis tools to identify deviations from normal behavior.

Mitigation Steps:

• Input Validation: Ensure all input parameters are properly validated and sanitized.
• Least Privilege: Implement the principle of least privilege to limit the impact of potential exploits.
• Regular Audits: Conduct regular security audits and penetration testing to identify and mitigate vulnerabilities.

References:

• VulDB Entry
• CTI Entry
• Submission Details
• Technical Analysis
• D-Link Official Website

By following these recommendations and staying vigilant, organizations can significantly reduce the risk posed by this critical vulnerability.