CVE-2019-18873 : Security Advisory and Response

FUDForum 3.0.9 contains a security issue allowing for Stored XSS (Cross-Site Scripting) vulnerability through the User-Agent HTTP header, potentially leading to remote code execution.

Understanding CVE-2019-18873

What is CVE-2019-18873?

FUDForum 3.0.9 is susceptible to a Stored XSS vulnerability via the User-Agent HTTP header, enabling attackers to execute remote code.

The Impact of CVE-2019-18873

This vulnerability could allow an attacker to exploit a user account, gaining complete control over the system and executing code on the remote server.

Technical Details of CVE-2019-18873

Vulnerability Description

The vulnerability exists in FUDForum 3.0.9, specifically in the admsession.php and admuser.php files, allowing for Stored XSS via the User-Agent HTTP header.

Affected Systems and Versions

Product: FUDForum 3.0.9
Vendor: N/A
Version: N/A

Exploitation Mechanism

Attackers can trigger the payload by accessing user information in the control panel's "User Manager" section, leading to the execution of PHP files in the web root.

Mitigation and Prevention

Immediate Steps to Take

Update FUDForum to the latest version to patch the vulnerability.
Implement input validation to prevent malicious code injection.

Long-Term Security Practices

Regularly monitor and audit user inputs and HTTP headers for suspicious activities.
Educate users on safe browsing practices and the importance of avoiding suspicious links.

Patching and Updates

Stay informed about security updates and patches released by FUDForum.