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The attacker might not have any user level access to the web application. However, this does not mean that the application cannot be attacked remotely. Arbitrary File Upload vulnerabilities could be triggered even by unauthenticated users.
In the exercise below, the attacker is not authenticated to the web application and needs to find a arbitrary file upload attack to eventually execute arbitrary commands on the server.
Wolf CMS is a free and open source content management system written in the PHP.
Wolfcms (0.8.2) is vulnerable to Arbitrary File Upload documented in CVE-2015-6567.
CVE is a registered trademark of The MITRE Corporation.
All relevant information to solve this lab is available on the CVE website.
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