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Craft2

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Gaining Access

Nmap scan:

$ nmap -p- --min-rate 4000 192.168.197.188
Starting Nmap 7.93 ( https://nmap.org ) at 2023-07-05 23:51 +08
Nmap scan report for 192.168.197.188
Host is up (0.17s latency).
Not shown: 65531 filtered tcp ports (no-response)
PORT      STATE SERVICE
80/tcp    open  http
135/tcp   open  msrpc
445/tcp   open  microsoft-ds
49666/tcp open  unknown

This is a continuation of the original Craft machine, and it appears that SMB is open for this machine. The last machine was pretty minimalist, so I think we might need this later.

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ODT Macro Fail -> NTLM Steal

The website is largely the same as the previous one. However, when we try to upload a ODT file, we get some additional information:

It appears that macros will not work again. Since SMB is open on this machine, I googled 'LibreOffice SMB Exploit' and this was the first result:

LogoLibreOffice/Apache Office Writer SMB Connection information disclosurevuldb.comchevron-right

There was a public exploit available for it, and I found that rather interesting. Using searchsploit returns the exploit PoC:

When using it, it states that we can steal NetNTLM creds using this:

The script also generates the file bad.odt for us to upload. I started a responder instance and uploaded the file. After a while, responder would capture a hash:

This hash can be cracked immediately to get the password for the user:

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SMB Shares -> Upload Web Shell

There wasn't SSH or WinRM open on the system, so instead, let's try to enumerate SMB using these credentials.

smbmap reveals that we can read some shares:

The WebApp one looked like the next stage. We can connect to it and view the files:

The previous machine Craft allowed us to upload webshells to the web directory, and it works here too:

We can then easily get a reverse shell by downloading nc.exe onto the machine and executing it.

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Privilege Escalation

This time, the apache user had no abusable privileges, and there was nothing much about the current user.

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RunasCs.exe -> Lateral Movement Fail

We still had thecybergeek password, and this is abusable using RunasCs.exe.

LogoGitHub - antonioCoco/RunasCs: RunasCs - Csharp and open version of windows builtin runas.exeGitHubchevron-right

The user had nothing interesting though.

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MySQL Arbitrary Write -> WerTrigger

I checked the ports open on the machine, and found quite a few such as HTTPS and MySQL not publicly facing:

Interesting. We can forward this using chisel.exe.

Then, we can access the MySQL database:

However, there was literally nothing in the database. Instead, let's view our privileges:

We seem to have all privileges enabled on the machine, and we can also read all files on the machine:

This was interesting, because it confirmed that we are running MySQL as the Administrator. However, we cannot execute commands as the exec module is just not present within the machine:

Since we can use load_file, this means we can also move files all over the place, giving us privileged file write over the machine:

This opens up quite a few exploits to getting an administrator shell, such as the WerTrigger exploit.

LogoGitHub - sailay1996/WerTrigger: Weaponizing for privileged file writes bugs with windows problem reportingGitHubchevron-right

To exploit this, we would need to have these files within a directory we control:

Afterwards, using the MySQL instance, we can place the phoneinfo.dll file into C:\Windows\System32.

Afterwards, just run WerTrigger.exe and our reverse shell command:

This would execute the command as the SYSTEM user:

Interesting root!

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