EUVD-2024-53546

Comprehensive Technical Analysis of EUVD-2024-53546

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the Linksys E7350 1.1.00.032 firmware involves a command injection flaw via the ifname parameter in the apcli_wps_gen_pincode function. This vulnerability allows an attacker to execute arbitrary commands on the affected device. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates 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.
• Privileges Required (PR): None (N) - No special privileges are needed 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 affect other systems or components beyond the targeted device.
• Confidentiality (C): High (H) - The vulnerability can lead to a significant breach of confidentiality.
• Integrity (I): High (H) - The vulnerability can lead to a significant breach of integrity.
• Availability (A): High (H) - The vulnerability can lead to a significant breach of availability.

2. Potential Attack Vectors and Exploitation Methods

The command injection vulnerability can be exploited through several attack vectors:

• Remote Exploitation: An attacker can send specially crafted network packets to the device, injecting malicious commands through the ifname parameter.
• Phishing and Social Engineering: Attackers may trick users into visiting malicious websites or downloading malicious scripts that exploit the vulnerability.
• Automated Scanning: Attackers can use automated tools to scan for vulnerable devices and exploit them en masse.

Exploitation methods may include:

• Command Injection: Crafting input that includes shell commands to be executed by the device.
• Payload Delivery: Using the vulnerability to deliver and execute malicious payloads, such as malware or ransomware.
• Data Exfiltration: Extracting sensitive information from the device, such as network configurations or user credentials.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Linksys E7350 router running firmware version 1.1.00.032. Other versions of the firmware and other Linksys models may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their devices and apply updates as necessary.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Immediately update the firmware to the latest version provided by Linksys.
• Network Segmentation: Isolate the affected device from critical networks to limit potential damage.
• Firewall Configuration: Implement strict firewall rules to block unauthorized access to the device.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity and potential exploitation attempts.
• User Education: Educate users about the risks of phishing and social engineering attacks.

5. Impact on European Cybersecurity Landscape

The discovery of this vulnerability highlights the importance of securing IoT devices, which are increasingly becoming targets for cyberattacks. The European cybersecurity landscape must prioritize the security of consumer and enterprise devices to prevent large-scale breaches. Regulatory bodies and manufacturers should collaborate to ensure timely updates and patches for identified vulnerabilities.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The apcli_wps_gen_pincode function is vulnerable to command injection via the ifname parameter.
• Exploitation Steps:
  1. Identify the target device running the vulnerable firmware.
  2. Craft a malicious input that includes shell commands.
  3. Send the crafted input to the device, triggering the command injection.
• Detection: Monitor network traffic for unusual patterns or commands being executed on the device.
• Response: Implement incident response plans to quickly identify and mitigate any successful exploitation attempts.

Conclusion

The command injection vulnerability in the Linksys E7350 1.1.00.032 firmware poses a significant risk to users and organizations. Immediate action is required to update the firmware and implement additional security measures to protect against potential exploitation. The European cybersecurity community must continue to emphasize the importance of securing IoT devices to maintain a robust defense against emerging threats.

References

• GitHub Repository
• Mitre CVE Assignment: CVE-2024-57223
• ENISA ID Product and Vendor: Not available

This analysis provides a comprehensive overview for cybersecurity professionals to understand and address the vulnerability effectively.