Description
In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitrary commands by calling the doGRETunnel function.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2024-45323
1. Vulnerability Assessment and Severity Evaluation
The vulnerability identified in Draytek Vigor3900 1.5.1.3 allows attackers to inject malicious commands into the mainfunction.cgi script and execute arbitrary commands by calling the doGRETunnel function. This vulnerability is classified with a CVSS Base Score of 9.8, indicating 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 can be exploited remotely over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources to exploit.
- Privileges Required (PR): None (N) - No special privileges are required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
- Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
- Confidentiality (C): High (H) - The vulnerability can lead to a complete breach of confidentiality.
- Integrity (I): High (H) - The vulnerability can lead to a complete breach of integrity.
- Availability (A): High (H) - The vulnerability can lead to a complete breach of availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves injecting malicious commands into the mainfunction.cgi script. This can be achieved through various methods, including:
- Remote Command Injection: An attacker can send specially crafted HTTP requests to the vulnerable endpoint, injecting commands that will be executed by the
doGRETunnelfunction. - Cross-Site Scripting (XSS): If the
mainfunction.cgiscript processes user input without proper sanitization, an attacker could inject malicious scripts that execute arbitrary commands. - Man-in-the-Middle (MitM) Attacks: An attacker could intercept and modify network traffic to inject malicious commands.
3. Affected Systems and Software Versions
The vulnerability specifically affects Draytek Vigor3900 devices running firmware version 1.5.1.3. It is crucial to note that other versions of the firmware may also be affected if they share the same codebase or have similar vulnerabilities.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Update Firmware: Immediately update the firmware to the latest version provided by Draytek. Ensure that the update process is verified and completed successfully.
- Network Segmentation: Implement network segmentation to isolate critical systems and reduce the attack surface.
- Input Validation: Ensure that all user inputs are properly validated and sanitized to prevent command injection.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for suspicious activities and potential exploitation attempts.
- Access Controls: Implement strict access controls to limit who can access and modify the device configuration.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.
5. Impact on European Cybersecurity Landscape
The vulnerability in Draytek Vigor3900 devices poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals relying on these devices for network security. The potential for remote command execution can lead to data breaches, unauthorized access, and disruption of services. Given the critical nature of the vulnerability, it is essential for European cybersecurity authorities to issue advisories and guidelines to ensure that affected parties take immediate action to mitigate the risk.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerable Component: The
mainfunction.cgiscript and thedoGRETunnelfunction are the primary points of vulnerability. - Exploitation Method: The attacker can inject commands by manipulating the input parameters passed to the
mainfunction.cgiscript. - Detection: Monitor network traffic for unusual patterns or attempts to access the
mainfunction.cgiscript. Implement logging and alerting mechanisms to detect and respond to suspicious activities. - Remediation: Patch the vulnerable firmware and ensure that all input validation and sanitization mechanisms are in place. Regularly review and update security policies to address emerging threats.
Conclusion
The vulnerability in Draytek Vigor3900 1.5.1.3 is critical and requires immediate attention. Organizations and individuals using these devices should prioritize updating their firmware and implementing robust security measures to protect against potential exploitation. The European cybersecurity community should collaborate to raise awareness and provide support to mitigate the risks associated with this vulnerability.