hermes - 💡(How to fix) Fix Command injection via shell=True in tui_gateway/server.py [1 comments, 2 participants]

TL;DR

Replace shell=True with shell=False and properly sanitize user input to prevent command injection vulnerabilities.

Guidance

• Identify and validate all user-supplied input that is passed to subprocess.run() to ensure it does not contain malicious commands.
• Use shlex.split() to split the command into arguments instead of relying on the shell to split it, which can help prevent injection attacks.
• Remove the except ImportError: pass block and instead ensure that the detect_dangerous_command module is properly imported and configured to handle safety checks.
• Consider implementing additional security measures, such as whitelisting allowed commands or using a more secure alternative to subprocess.run().

Example

import shlex
# ...
r = subprocess.run(shlex.split(qc.get("command", "")), capture_output=True, text=True, timeout=30)

Notes

The provided code snippets are vulnerable to command injection attacks, and the suggested fixes aim to mitigate these risks. However, a comprehensive security audit and testing are recommended to ensure the fixes are effective and do not introduce new vulnerabilities.

Recommendation

Apply the suggested fixes, including replacing shell=True with shell=False and sanitizing user input, to prevent command injection attacks. This approach is more secure than relying on the detect_dangerous_command module alone, which may not catch all potential threats.