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An attacker might get administrative access to a web application. However, this does not automatically mean that the web server can be compromised. In cases where a SaaS application is made available to users, it is routine to give each user admin access to his own instance of the web application e.g. a managed hosted Wordpress site. In such scenario, the attacker who will begin accessing the application as a managed administrative user will have to figure out how to exploit the administrative interface to get a shell on the server. In some cases, it might be possible to do privilege escalation as well.
In the exercise below, the attacker has administrative access to the web application and needs to find a arbitrary file upload attack to eventually run arbitrary commands on the server.
Frog CMS is a free and open source content management system written in the PHP.
Frog CMS (0.9.5) is vulnerable to a Arbitrary File Upload documented in CVE-2014-4912.
The following username and passwords may be used to explore the application and/or find a vulnerability which might require authenticated access:
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