Sandbox Process Creation

[pixeebot[bot]]

This codemod sandboxes all instances of subprocess.run and subprocess.call to offer protection against attack.

Left unchecked, subprocess.run and subprocess.call can execute any arbitrary system command. If an attacker can control part of the strings used as program paths or arguments, they could execute arbitrary programs, install malware, and anything else they could do if they had a shell open on the application host.

Our change introduces a sandbox which protects the application:

  import subprocess
+ from security import safe_command
  ...
- subprocess.run("echo 'hi'", shell=True)
+ safe_command.run(subprocess.run, "echo 'hi'", shell=True)
  ...
- subprocess.call(["ls", "-l"])
+ safe_command.call(subprocess.call, ["ls", "-l"])

The default safe_command restrictions applied are the following:

• Prevent command chaining. Many exploits work by injecting command separators and causing the shell to interpret a second, malicious command. The safe_command functions attempt to parse the given command, and throw a SecurityException if multiple commands are present.
• Prevent arguments targeting sensitive files. There is little reason for custom code to target sensitive system files like /etc/passwd, so the sandbox prevents arguments that point to these files that may be targets for exfiltration.

There are more options for sandboxing if you are interested in locking down system commands even more.

Dependency Updates

This codemod relies on an external dependency. However, we were unable to automatically add the dependency to your project.

This library holds security tools for protecting Python API calls.

There are a number of places where Python project dependencies can be expressed, including setup.py, pyproject.toml, setup.cfg, and requirements.txt files. You may need to manually add this dependency to the proper location in your project.

Manual Installation

For setup.py:

 install_requires=[
+    "security==1.2.1",
 ],

For pyproject.toml (using setuptools):

 [project]
 dependencies = [
+    "security==1.2.1",
 ]

For setup.cfg:

 [options]
 install_requires =
+    security==1.2.1

For requirements.txt:

+security==1.2.1

For more information on adding dependencies to setuptools projects, see the setuptools documentation.

If you are using another build system, please refer to the documentation for that system to determine how to add dependencies.

More reading

* [https://github.com/pixee/python-security/blob/main/src/security/safe_command/api.py](https://github.com/pixee/python-security/blob/main/src/security/safe_command/api.py) * [https://cheatsheetseries.owasp.org/cheatsheets/OS_Command_Injection_Defense_Cheat_Sheet.html](https://cheatsheetseries.owasp.org/cheatsheets/OS_Command_Injection_Defense_Cheat_Sheet.html)

Powered by: pixeebot (codemod ID: pixee:python/sandbox-process-creation)

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Thanks @pixeebot[bot] for opening this PR!

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[git-greetings[bot]]

PR Details of @pixeebot[bot] in odin-lang-Odin :	OPEN	CLOSED	TOTAL
1	2	3

[pixeebot[bot]]

I'm confident in this change, but I'm not a maintainer of this project. Do you see any reason not to merge it?

If this change was not helpful, or you have suggestions for improvements, please let me know!

[pixeebot[bot]]

Just a friendly ping to remind you about this change. If there are concerns about it, we'd love to hear about them!

[pixeebot[bot]]

This change may not be a priority right now, so I'll close it. If there was something I could have done better, please let me know!

You can also customize me to make sure I'm working with you in the way you want.