Smoothwall Express Reflected Cross-Site Scripting Vulnerability

A reflected cross-site scripting vulnerability has been identified in Smoothwall Express version 3.1-SP4-polar-x86_64-update9. This vulnerability allows attackers to inject malicious scripts by manipulating the MACHINE and MACHINECOMMENT parameters. Exploitation involves sending POST requests to the outgoing.cgi endpoint with script payloads, which are then executed as arbitrary JavaScript in the users' browsers, potentially leading to the theft of session data.

Impact

Exploitation of this vulnerability allows for reflected cross-site scripting, where injected scripts are executed in the context of the user's browser.

Reproduction

To reproduce this vulnerability, send a POST request to the 'outgoing.cgi' endpoint. Include a script payload in the 'MACHINE' or 'MACHINECOMMENT' parameters. The injected script will be executed in the browser, demonstrating the cross-site scripting vulnerability.