CMS Made Simple 2.2.8 Remote Code Execution

An issue was discovered in CMS Made Simple version 2.2.8. In the module DesignManager (in the files action.admin_bulk_css.php and action.admin_bulk_template.php), with an unprivileged user with Designer permission, it is possible to reach an unserialize call with a crafted value in the m1_allparms parameter, and achieve object injection. This Metasploit module has been successfully tested on CMS Made Simple versions 2.2.6, 2.2.7, 2.2.8, 2.2.9 and 2.2.9.1.

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