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Compromise a Web Server Upload Files to Check for Privilege

Compromise a Web Server Upload Files to Check for Privilege

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Here we can create the database if it does not already exist. If it does exist, it will just reset it anyway. Click the "Create / Reset Database" button to ...

Now that we know our command shell is functioning, it's finally time to run the unix-privesc-check script. On Unix systems, the dot slash (.

Before we begin, there are a few things that need to be done first to get DVWA ready as the target. First, log in to DVWA with the default credentials, ...

We are interested in uploading files, so all we have to do is go to the URL it gives us in the browser. When we do that, we are greeted by a file uploader:

Since the script is now located in the /var/www/ directory on the server, we should be able to access it by simply appending the name to the URL, like so:

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

Compromise a Web Server & Upload Files to Check for Privilege Escalation, ...

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

But hold on. It seems like the only thing that's happening is the script itself is being displayed in the browser window, which is not what we want.

Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part 2

This tells us that the database system in use is MySQL and that this is very likely a vulnerable injection point. But just to be sure, because you really ...

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

In Firefox, navigate to the "Network" tab and reload the page. Click on the GET request with the status code 200, then on the right, under "Headers," scroll ...

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

This script checks a lot of things, and while we can see the results, it's not very useful if we lose our connection or want to come back and review our ...

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

How to Compromise a Web Server & Upload Files to Check for Privilege Escalation, Part

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In the course of one penetration test, we found that the NT SERVICE\MSSQLSERVER user had SeImpersonatePrivilege privileges in the OS.

Because we only have a lower privilege shell with limited access, to fully compromise the machine we will need to escalate our privileges.

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We find an Apache webserver running on port 8022. Let's look into that. Open firefox and enter the IP adress + the port: 192.168.0.205:8022.

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The user was part of the server administrator group, with access configured to require a smart card.

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