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Log in to your own account. On the "My account" page, notice the option to delete your account by sending a
POSTrequest to/my-account/delete. - Send a request containing a session cookie to Burp Repeater.
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In Burp Repeater, study the session cookie using the Inspector panel. Notice that the serialized object has an
avatar_linkattribute, which contains the file path to your avatar. -
Edit the serialized data so that the
avatar_linkpoints to/home/carlos/morale.txt. Remember to update the length indicator. The modified attribute should look like this:s:11:"avatar_link";s:23:"/home/carlos/morale.txt" - Click "Apply changes". The modified object will automatically be re-encoded and updated in the request.
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Change the request line to
POST /my-account/deleteand send the request. Your account will be deleted, along with Carlos'smorale.txtfile.
Lab: Using application functionality to exploit insecure deserialization
This lab uses a serialization-based session mechanism. A certain feature invokes a dangerous method on data provided in a serialized object. To solve the lab, edit the serialized object in the session cookie and use it to delete the morale.txt file from Carlos's home directory.
You can log in to your own account using the following credentials: wiener:peter
You also have access to a backup account: gregg:rosebud
