Mongoose Web Server <= 2.8 Slash Character Remote File Disclosure Vulnerability

# Copyright (C) 2010 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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.

CPE = "cpe:/a:cesanta:mongoose";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.100735");
  script_version("2022-04-12T08:46:17+0000");
  script_tag(name:"last_modification", value:"2022-04-12 08:46:17 +0000 (Tue, 12 Apr 2022)");
  script_tag(name:"creation_date", value:"2010-08-02 14:28:14 +0200 (Mon, 02 Aug 2010)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_cve_id("CVE-2009-4535");

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

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

  script_name("Mongoose Web Server <= 2.8 Slash Character Remote File Disclosure Vulnerability");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2010 Greenbone Networks GmbH");
  script_family("Web Servers");
  script_dependencies("gb_mongoose_web_server_http_detect.nasl");
  script_mandatory_keys("cesanta/mongoose/http/detected");
  script_require_ports("Services/www", 80);

  script_tag(name:"summary", value:"Mongoose Web Server is prone to a remote file-disclosure
  vulnerability because it fails to properly sanitize user-supplied input.");

  script_tag(name:"impact", value:"An attacker can exploit this vulnerability to view the source
  code of files in the context of the server process, which may aid in further attacks.");

  script_tag(name:"affected", value:"This issue affects Mongoose Web Server version 2.8. Other
  versions may be vulnerable as well.");

  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_xref(name:"URL", value:"http://www.securityfocus.com/bid/42051");

  exit(0);
}

include("host_details.inc");
include("http_func.inc");
include("http_keepalive.inc");

if( ! port = get_app_port( cpe:CPE, service:"www" ) )
  exit( 0 );

if( ! get_app_location( cpe:CPE, port:port, nofork:TRUE ) )
  exit( 0 );

host = http_host_name( dont_add_port:TRUE );

phps = http_get_kb_file_extensions( port:port, host:host, ext:"php" );
if( ! isnull( phps ) ) {
  phps = make_list( phps );
} else {
  phps = make_list( "/index.php" );
}

x = 0;

foreach php( phps ) {
  x++;
  url = php + "/";

  if( buf = http_vuln_check( port:port, url:url, pattern:"<\?(php)?", check_header:TRUE ) ) {
    if( "Content-Type: text/plain" >< buf ) {
      if( ! http_vuln_check( port:port, url:php, pattern:"<\?(php)?" ) ) {
        report = http_report_vuln_url( port:port, url:url );
        security_message( port:port, data:report );
        exit( 0 );
      }
    }
  }
  if( x >= 3 )
    exit( 0 );
}

exit( 99 );