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Introduced protections against system command injection #1
Introduced protections against system command injection #1
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Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information |
Micro-Learning Topic: OS command injection (Detected by phrase)Matched on "command injection"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 WarriorHelpful references
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Check out the playback for this Pull Request here. |
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String line = Files.readString(inputFile); | ||
System.out.println("Running command: " + line); | ||
String[] command = line.split(" "); | ||
Process process = Runtime.getRuntime().exec(command); | ||
Process process = SystemCommand.runCommand(Runtime.getRuntime(), command); |
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The code reads a command from a file and executes it without any validation or sanitization. This poses a significant security risk, as it could allow the execution of arbitrary commands if the input file is compromised or maliciously crafted. To mitigate this risk, it's crucial to implement strict validation of the input command. Ensure that only allowed commands or patterns are executed, and consider using a whitelist approach to limit the commands that can be run.
String[] command = line.split(" "); | ||
Process process = Runtime.getRuntime().exec(command); | ||
Process process = SystemCommand.runCommand(Runtime.getRuntime(), command); |
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Splitting the command string by spaces to form the command array for execution can lead to issues when the command includes arguments with spaces enclosed in quotes. This simplistic splitting approach will incorrectly divide such arguments into separate elements of the command array, potentially causing the command to fail or behave unexpectedly. To address this, consider using a more sophisticated parsing method that respects quoted strings as single arguments, or leverage existing libraries designed to parse command-line arguments accurately.
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. |
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:
The default restrictions applied are the following:
SystemCommand#runCommand()
attempts to parse the given command, and throw aSecurityException
if multiple commands are present./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
Maven
More reading
I have additional improvements ready for this repo! If you want to see them, leave the comment:
... and I will open a new PR right away!
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