Some vulnerabilities have been discovered in Simple Machines Forum, which can be exploited by malicious people to conduct cross-site request forgery attacks and by malicious users to disclose potentially sensitive information and compromise a vulnerable system.

1) The application allows users to perform certain actions via HTTP requests without performing any validity checks to verify the request. This can be exploited to e.g. perform certain administrative actions when a logged-in user visits a malicious site.

Successful exploitation allows e.g. to install arbitrary packages and execute arbitrary PHP code, but requires a valid user account to upload a package file as an attachment.

2) The "theme_dir" setting of users is not properly verified before being used, which can be exploited to include arbitrary files from local resources.

Successful exploitation in combination with malicious uploads (e.g. avatars) allows to execute arbitrary PHP code, but requires a valid user account.

The vulnerabilities are confirmed in version 1.1.6. Other versions may also be affected.

Solution
Update to version 1.0.15 or 1.1.7.

Provided and/or discovered by
1) Charles FOL
2) ~elmysterio ( a.k.a us )

Changelog
Further details available to Secunia VIM customers

Original Advisory
Simple Machines LLC:
http://www.simplemachines.org/community/index.php?topic=272861.0

1) http://milw0rm.com/exploits/6993
2) http://milw0rm.com/exploits/7011

Deep Links
Links available to Secunia VIM customers