CVE-2018-18830 : What You Need to Know

A vulnerability was found in the com\mingsoft\basic\action\web\FileAction.java file in MCMS 4.6.5, allowing for arbitrary code execution.

Understanding CVE-2018-18830

This CVE describes a security flaw in MCMS 4.6.5 that enables the upload of malicious JSP code.

What is CVE-2018-18830?

The vulnerability in the FileAction.java file of MCMS 4.6.5 permits unauthorized file uploads without proper user verification, leading to potential code execution.

The Impact of CVE-2018-18830

The exploit allows attackers to upload JSP code disguised as a .png file, bypassing security measures and executing arbitrary code on the server.

Technical Details of CVE-2018-18830

This section delves into the specifics of the vulnerability.

Vulnerability Description

The lack of user login status verification in the upload interface of MCMS 4.6.5 enables the upload of files without setting a cookie, facilitating the execution of arbitrary JSP code.

Affected Systems and Versions

Affected Version: MCMS 4.6.5

Exploitation Mechanism

The exploit involves initiating an upload of JSP code with a .png filename, changing the suffix to .jsp in the name parameter, and intercepting the server's response to obtain the file's storage path for executing malicious JSP code.

Mitigation and Prevention

Protecting systems from CVE-2018-18830 requires immediate actions and long-term security practices.

Immediate Steps to Take

Implement user login status verification in the upload interface to prevent unauthorized file uploads.
Regularly monitor file uploads for suspicious activities.

Long-Term Security Practices

Conduct regular security audits to identify and address vulnerabilities.
Educate users on safe file upload practices to prevent malicious code execution.

Patching and Updates

Apply patches or updates provided by the vendor to fix the vulnerability and enhance system security.