CVE-2018-18320 : What You Need to Know

A vulnerability has been identified in the 0.6.6 version of the Merlin.PHP component used in Asuswrt-Merlin devices, allowing unauthorized command execution.

Understanding CVE-2018-18320

This CVE involves a security issue in the Merlin.PHP component used in Asuswrt-Merlin devices, potentially enabling attackers to execute arbitrary commands.

What is CVE-2018-18320?

The vulnerability in the 0.6.6 version of Merlin.PHP allows attackers to run unauthorized commands due to a popen call in exec.php. The vendor specifies that Merlin.PHP is meant for secure intranet use but permits remote code execution.

The Impact of CVE-2018-18320

The presence of this vulnerability can lead to unauthorized command execution by malicious actors, compromising the security of Asuswrt-Merlin devices.

Technical Details of CVE-2018-18320

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability arises from a popen call in exec.php within the 0.6.6 version of the Merlin.PHP component, enabling attackers to execute unauthorized commands.

Affected Systems and Versions

Affected Component: Merlin.PHP 0.6.6
Affected Devices: Asuswrt-Merlin devices

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the popen call in exec.php to execute unauthorized commands on the affected devices.

Mitigation and Prevention

Protecting systems from CVE-2018-18320 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable external access to Merlin.PHP if not required for functionality.
Implement network segmentation to restrict access to vulnerable components.
Monitor and analyze network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch the Merlin.PHP component and associated devices.
Conduct security audits and penetration testing to identify and address vulnerabilities proactively.
Educate users and administrators about secure usage practices and potential risks.
Consider implementing additional security measures such as intrusion detection systems.

Patching and Updates

Ensure that the Merlin.PHP component is updated to a secure version that addresses the vulnerability to prevent exploitation.