InfoSec LAB

Internal_OffSec_SMB

Created: 3 min read

SMB

Nmap discovered a Windows Directory service on the target ports 139 and 445

┌──(kali㉿kali)-[~/PEN-200/PG_PRACTICE/internal_offsec]
└─$ nmap --script smb-enum-shares -sV -p139,445 $IP
Starting Nmap 7.95 ( https://nmap.org ) at 2025-03-07 20:44 CET
Nmap scan report for 192.168.136.40
Host is up (0.042s latency).
 
PORT    STATE SERVICE      VERSION
139/tcp open  netbios-ssn  Microsoft Windows netbios-ssn
445/tcp open  microsoft-ds Microsoft Windows Server 2008 R2 microsoft-ds (workgroup: WORKGROUP)
Service Info: Host: INTERNAL; OS: Windows; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_server_2008:r2
 
Host script results:
| smb-enum-shares: 
|   note: ERROR: Enumerating shares failed, guessing at common ones (NT_STATUS_ACCESS_DENIED)
|   account_used: <blank>
|   \\192.168.136.40\ADMIN$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|     Anonymous access: <none>
|   \\192.168.136.40\C$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|     Anonymous access: <none>
|   \\192.168.136.40\IPC$: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|     Anonymous access: READ
|   \\192.168.136.40\PUBLIC: 
|     warning: Couldn't get details for share: NT_STATUS_ACCESS_DENIED
|_    Anonymous access: <none>
 
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 28.95 seconds

Share mapping failed but anonymous access appears partially allowed

┌──(kali㉿kali)-[~/PEN-200/PG_PRACTICE/internal_offsec]
└─$ nxc smb $IP -u '' -p '' --shares --interfaces  
SMB         192.168.136.40  445    INTERNAL         [*] Windows Server (R) 2008 Standard 6001 Service Pack 1 x32 (name:INTERNAL) (domain:internal) (signing:False) (SMBv1:True)
SMB         192.168.136.40  445    INTERNAL         [+] internal\: 
SMB         192.168.136.40  445    INTERNAL         [-] Error enumerating shares: STATUS_ACCESS_DENIED

N/A The host system is Windows Server 2008 R2

Vulnerabilities

┌──(kali㉿kali)-[~/PEN-200/PG_PRACTICE/internal_offsec]
└─$ nmap --script smb-vuln* -sV -p139,445 $IP                  
Starting Nmap 7.95 ( https://nmap.org ) at 2025-03-07 21:01 CET
Nmap scan report for INTERNAL (192.168.136.40)
Host is up (0.025s latency).
 
PORT    STATE SERVICE      VERSION
139/tcp open  netbios-ssn  Microsoft Windows netbios-ssn
445/tcp open  microsoft-ds Microsoft Windows Server 2008 R2 microsoft-ds (workgroup: WORKGROUP)
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_server_2008:r2
 
Host script results:
| 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:
|       http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3103
|_      https://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: EOF
 
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 66.69 seconds

CVE-2009-3103 or MS09-050

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