Disassembly of ippsec’s youtube video HackTheBox - Arctic. Focus on Windows and basic enumeration, intercepting an application communications via burp. Shell creation with Unicorn and powershell usage along with windows enumeration.
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This series of write-up will contain comprehensive write-ups of hackthebox machines. In an effort to sharpen reporting techniques and help solidify the understand and methodologies used during penetration testing.
Port 135 = Windows RPC Port 8500 = doesn’t know what it is Port 49154 = Windows RPC
page takes a significant amount of time to load possibly why the name Arctic.
an “administrator” page is found.
if page loads correct should say Cold Fusion 8
we have results pointing to the version 8.x.x but are cross site scripting. But there is
which is a metasploit file upload, a possible way to get a foothold into the box.
exploit/windows/http/coldfusion_fckeditor looks like the same exploit from the searchsploit.
almost immediately fails due to the response time that needs to be adjusted in metasploit.
Modify advanced options
hoping to see a POST request and a server response.
If the module doesn’t support a proxy script we can push the module/communications to burp:
setup burp to intercept application
proxy tab > options > add proxy listeners
bind to 8500
tick box for running:
go to web browser
every time we connect to 8500 we get redirected to 10.10.10.11:8500
Turn intercept on:
and at this point we are now redirecting through burp (forward first request) then:
see the request metasploit is trying to make. Next send to repeater and send:
how this exploit works is that the Post request is sent to CurrentFolder and a .jsp file is added but with a %00 null byte at the end which confuses the web-server and allows for the file to upload.
Finished 200 response:
Futhermore, the script is going to try to open a connection to our local box on port 4444 thus we need to have a listener setup to catch the connection.
navigate to the k.jsp page
wait the 20-30s for the connection to establish.
Reverse Shell - RCE
a connection is established via the K.jsp file to port 4444:
this is just a reverse shell and we need to upgrade it.
unicorn to upgrade shell
Github Link: https://github.com/trustedsec/unicorn
output’s two files when it’s done.
First file: unicorn.rc - all commands to load unicorn in metasploit Second file: powershell_attack.txt = unicorn powershell exploit
command is very long but can return a shell. Sending this all through one terminal might not be the best call the better option would be to have the file sent to target.
load metasploit w/ unicorn command
create powershell_attack to html
create a new file with a pasted clipboad of the exploit and named it
delete the double quote in the beginning and the end of the powershell script to have a pure version of it. Now we have a script that has been obfuscated to evade antivirus.
setup local SimpleHTTPServer
On target shell:
box hits the web-server:
firstly, check the sysinfo to see architecture and the meterpreter session is in a 32bit session.
search suggest - checks KBs on box and recommended exploits
first ran in a 32bit bit process and then migrate to a x64 as different exploits become available. Run PowerUp.ps1 if nothing returns. (results)
save results as a copy locally.
migrate to 64bit
Looking for a process with an x64 and a 1 as that means its interactive and there is more leverage on the things it has the ability to do. None in this case.
migrate to conhost:
Run “sysinfo” to verify were on a x64 process:
confirmed x64, background with ctrl+z show options # check for suggester run
returns only one that appears to be vulnerable. Save to notes
ms10_092_schelevator reported on both architectures. Which should be a stong first to try.
in this scenairo it actually used a local 172. IP which was not intendted as so the set LHOST 10.10.12.194 was sent again and ran.
session 2 was successfully opened
Achieved NT AUTHORITY\SYSTEM
If you don’t know who ippsec is check him out at:
Youtube: https://www.youtube.com/channel/UCa6eh7gCkpPo5XXUDfygQQA Twitter: https://twitter.com/ippsec