Exghost
Gaining Access
Nmap scan:
$ nmap -p- --min-rate 4000 -Pn 192.168.183.183
Starting Nmap 7.93 ( https://nmap.org ) at 2023-07-11 20:36 +08
Nmap scan report for 192.168.183.183
Host is up (0.18s latency).
Not shown: 65532 filtered tcp ports (no-response)
PORT STATE SERVICE
21/tcp open ftp
80/tcp open httpFTP and HTTP.
Port 80 Dead End
Port 80 just shows a 403 page:
Running directory scans only shows one directory:
FTP Brute Force -> Wireshark
Anonymous credentials don't work with this FTP system, and because we had no other choice, I started brute forcing the FTP login with hydra. This took quite a while, but eventually I found some credentials:
Great! Now we can login and view the files present:
The backup file was a PCAP file:
We can open this up in wireshark and view the TCP streams. Within TCP Stream 1, we can find this HTTP request:
Seems that we are able to upload files through POST requests at exiftest.php:
From the PCAP file, we can actually export the exiftest.php file:
Interestingly the second exiftest.php was the response, and here's the contents:
File Upload -> Exiftool RCE
It appears that the website is accepting images, and then running exiftool on it as a response. This version of exiftool is vulnerable to an RCE exploit.
We can create the payload by following the PoC:
We can then upload it using this script:
After uploading it, we would get a shell as www-data:
Privilege Escalation
Sudo Exploit -> Root
I ran a linpeas.sh scan on the machine. This found that sudo was outdated:
We can just download the Python script and execute it to get a root shell:
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