CVE-2024-51260

Comprehensive Technical Analysis of CVE-2024-51260

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-51260 CVSS Score: 9.8

The vulnerability in DrayTek Vigor3900 version 1.5.1.3 allows attackers to inject malicious commands into the mainfunction.cgi script and execute arbitrary commands by calling the acme_process function. The CVSS score of 9.8 indicates a critical severity level, reflecting the potential for significant impact if exploited. This high score is likely due to the ease of exploitation, the potential for complete system compromise, and the lack of user interaction required for exploitation.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Command Injection: Attackers can exploit this vulnerability by sending crafted HTTP requests to the mainfunction.cgi script, injecting malicious commands that are then executed by the acme_process function.
• Network-Based Attacks: Given that DrayTek Vigor3900 is a network device, attackers can exploit this vulnerability over the network, potentially from the internet if the device is exposed.

Exploitation Methods:

• Command Injection: By injecting commands into the mainfunction.cgi script, attackers can execute arbitrary system commands, leading to actions such as data exfiltration, system configuration changes, or further malware deployment.
• Privilege Escalation: If the acme_process function runs with elevated privileges, attackers can gain higher-level access to the system, potentially leading to full control over the device.

3. Affected Systems and Software Versions

Affected Systems:

• DrayTek Vigor3900 devices running firmware version 1.5.1.3.

Software Versions:

• Specifically, version 1.5.1.3 of the DrayTek Vigor3900 firmware.

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Apply the latest firmware update provided by DrayTek to mitigate the vulnerability.
• Network Segmentation: Isolate the affected devices from the public internet and limit access to trusted networks only.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the mainfunction.cgi script.

Long-Term Strategies:

• Regular Updates: Ensure that all network devices are regularly updated with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
• Access Control: Implement strong access control measures, including multi-factor authentication (MFA) and least privilege principles.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2024-51260 highlights the ongoing risk associated with network devices, particularly those that are internet-facing. The critical nature of this vulnerability underscores the importance of regular security audits and timely patch management. Organizations must be vigilant in monitoring and securing their network infrastructure to prevent such vulnerabilities from being exploited.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Component: mainfunction.cgi script.
• Exploitable Function: acme_process.
• Exploitation Mechanism: Command injection through crafted HTTP requests.

Detection and Response:

• Log Analysis: Monitor logs for unusual activities related to the mainfunction.cgi script and the acme_process function.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous command executions and network traffic patterns.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts, including isolating affected devices and applying necessary patches.

References:

• DrayTek Vigor3900 1.5.1.3 Vulnerability Report (Note: The link is currently broken, but the document may contain additional technical details if accessed.)

Conclusion

CVE-2024-51260 represents a critical vulnerability in DrayTek Vigor3900 devices that, if exploited, could lead to severe consequences. Organizations must prioritize applying the latest firmware updates and implementing robust security measures to mitigate the risk. Continuous monitoring and proactive security practices are essential to safeguard against such vulnerabilities in the future.