Precious - HTB - Writeup

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Let's go ahead and start with a

┌──(root㉿kali)-[~/Documents/ctf/htb/precious]
└─# sudo nmap -sV -sC -O -T4 -n -Pn -oA nmap $ip   

Starting Nmap 7.93 ( https://nmap.org ) at 2023-01-05 18:54 EST
Nmap scan report for 10.129.17.135
Host is up (0.14s latency).
Not shown: 998 closed tcp ports (reset)
PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 8.4p1 Debian 5+deb11u1 (protocol 2.0)
| ssh-hostkey: 
|   3072 845e13a8e31e20661d235550f63047d2 (RSA)
|   256 a2ef7b9665ce4161c467ee4e96c7c892 (ECDSA)
|_  256 33053dcd7ab798458239e7ae3c91a658 (ED25519)
80/tcp open  http    nginx 1.18.0
|_http-title: Did not follow redirect to http://precious.htb/
|_http-server-header: nginx/1.18.0
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=7.93%E=4%D=1/5%OT=22%CT=1%CU=37727%PV=Y%DS=2%DC=I%G=Y%TM=63B76363
OS:%P=x86_64-pc-linux-gnu)SEQ(SP=107%GCD=1%ISR=10D%TI=Z%CI=Z%II=I%TS=A)OPS(
OS:O1=M537ST11NW7%O2=M537ST11NW7%O3=M537NNT11NW7%O4=M537ST11NW7%O5=M537ST11
OS:NW7%O6=M537ST11)WIN(W1=FE88%W2=FE88%W3=FE88%W4=FE88%W5=FE88%W6=FE88)ECN(
OS:R=Y%DF=Y%T=40%W=FAF0%O=M537NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS
OS:%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=
OS:Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=
OS:R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T
OS:=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD=
OS:S)

Network Distance: 2 hops
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

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 27.32 seconds

I ran a dirsearch on the page. It did not pop anything. Decided to spin up a quick python webserver and see it it grabs files from my Attacker Box. Sure enough it grabs then and generates a pdf.

I clicked around and couldnt do much. I inspected the pdf and seen we were giving a version, of pdfkit v0.8.6.

A quick google search came up with a Github repo with PoC for this version with a the CVE-2022-25765 linked to it. I tried it out below and it works. 56 We do some basic enumeration and find credentials in a config file that leads us to get user as henry.