Introduced protections against system command injection

[pixeebot]

This change hardens all instances of Runtime#exec() to offer protection against attack.

Left unchecked, Runtime#exec() can execute any arbitrary system command. If an attacker can control part of the strings used to 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 io.github.pixee.security.SystemCommand;
  ...
- Process p = Runtime.getRuntime().exec(command);
+ Process p = SystemCommand.runCommand(Runtime.getRuntime(), command);

The default 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 SystemCommand#runCommand() attempts 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.

❌ The following packages couldn't be installed automatically, probably because the dependency manager is unsupported. Please install them manually:

Gradle

dependencies {
  implementation("io.github.pixee:java-security-toolkit:1.2.0")
}

Maven

<dependencies>
  <dependency>
    <groupId>io.github.pixee</groupId>
    <artifactId>java-security-toolkit</artifactId>
    <version>1.2.0</version>
  </dependency>
<dependencies>

More reading

• https://cheatsheetseries.owasp.org/cheatsheets/OS_Command_Injection_Defense_Cheat_Sheet.html
• https://wiki.sei.cmu.edu/confluence/display/java/IDS07-J.+Sanitize+untrusted+data+passed+to+the+Runtime.exec%28%29+method

I have additional improvements ready for this repo! If you want to see them, leave the comment:

@pixeebot next

... and I will open a new PR right away!

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Feedback | Community | Docs | Codemod ID: pixee:java/harden-process-creation

[Frooodle]

@pixeebot We also use ProcessBuilder to run some commands if you can add similar feature for that 👀

[github-actions]

🚀 Translation Verification Summary

📋 Checking with the file messages_en_GB.properties from the main-branch - Checking the pr-branch

🗂️ Checking File: messages_pt_BR.properties...

• Test 1 Status: ✅ Passed
• Test 2 Status: ✅ Passed

---

✅ Overall Check Status: Success

[nahsra]

@pixeebot We also use ProcessBuilder to run some commands if you can add similar feature for that 👀

Thanks for the note! We added a ticket.