Introduced protections against system command injection

pixeebot[bot] commented 9 months ago

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.

:x: 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:1.1.2") }

Maven

io.github.pixee java-security-toolkit 1.1.2

Micro-Learning Topic: OS command injection (Detected by phrase)

Matched on "command injection"

What is this? (2min video)

In many situations, applications will rely on OS provided functions, scripts, macros and utilities instead of reimplementing them in code. While functions would typically be accessed through a native interface library, the remaining three OS provided features will normally be invoked via the command line or launched as a process. If unsafe inputs are used to construct commands or arguments, it may allow arbitrary OS operations to be performed that can compromise the server.

Try a challenge in Secure Code Warrior

Helpful references

OWASP Command Injection - OWASP community page with comprehensive information about command injection, and links to various OWASP resources to help detect or prevent it.
OWASP testing for Command Injection - This article is focused on providing testing techniques for identifying command injection flaws in your applications

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2lambda123 / aqa-tests