Discuz! <= 4.0.0 rc4 Arbitrary File Upload Flaw

# SPDX-FileCopyrightText: 2005 David Maciejak
# 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("1.3.6.1.4.1.25623.1.0.19751");
  script_version("2023-12-13T05:05:23+0000");
  script_tag(name:"last_modification", value:"2023-12-13 05:05:23 +0000 (Wed, 13 Dec 2023)");
  script_tag(name:"creation_date", value:"2006-03-26 17:55:15 +0200 (Sun, 26 Mar 2006)");
  script_cve_id("CVE-2005-2614");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("Discuz! <= 4.0.0 rc4 Arbitrary File Upload Flaw");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2005 David Maciejak");
  script_family("Gain a shell remotely");
  script_dependencies("find_service.nasl", "no404.nasl", "webmirror.nasl", "DDI_Directory_Scanner.nasl", "gb_php_http_detect.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_xref(name:"URL", value:"http://archives.neohapsis.com/archives/fulldisclosure/2005-08/0440.html");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/14564");

  script_tag(name:"solution", value:"Upgrade to the latest version of this software.");

  script_tag(name:"summary", value:"According to its version, the installation of Discuz! on the remote host
  fails to properly check for multiple extensions in uploaded files.");

  script_tag(name:"impact", value:"An attacker may be able to exploit this issue to execute arbitrary commands
  on the remote host subject to the privileges of the web server user id, typically nobody.");

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

  exit(0);
}

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

port = http_get_port(default:80);
if( ! http_can_host_php(port:port) )
   exit(0);

foreach dir( make_list_unique( "/discuz", http_cgi_dirs( port:port ) ) ) {

  if( dir == "/" )
    dir = "";

  url = string(dir, "/index.php");
  r = http_get_cache(item:url, port:port);
  if(!r)
    continue;

  if(("powered by Discuz!</title>" >< r) && egrep(pattern:'<meta name="description" content=.+Powered by Discuz! Board ([1-3]|4\\.0\\.0RC[0-4])', string:r)) {
    report = http_report_vuln_url( port:port, url:url );
    security_message( port:port, data:report );
    exit( 0 );
  }
}

exit( 99 );