WebCalendar Login Error Message User Account Enumeration

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

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

if (description)
{
  script_id(21566);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/06/01");

  script_cve_id("CVE-2006-2247");
  script_bugtraq_id(17853);

  script_name(english:"WebCalendar Login Error Message User Account Enumeration");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by an information disclosure issue.");
  script_set_attribute(attribute:"description", value:
"The version of WebCalendar on the remote host is prone to a user
account enumeration weakness in that in response to login attempts it
returns different error messages depending on whether the user exists
or the password is invalid.");
  script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/433053/30/0/threaded");
  script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/436263/30/0/threaded");
  # http://sourceforge.net/project/shownotes.php?group_id=3870&release_id=423010
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2fe61fc9");
  script_set_attribute(attribute:"solution", value:
"Upgrade to WebCalendar 1.0.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  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:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2006/05/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/05/16");

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

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

  script_copyright(english:"This script is Copyright (C) 2006-2022 Tenable Network Security, Inc.");

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

  exit(0);
}

#code

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

port = get_http_port(default:80, embedded:TRUE);
if (!get_port_state(port)) exit(0);
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];
  url = string(dir, "/login.php");

  req = http_get(item:url, port:port);
  res = http_keepalive_send_recv(port:port, data:req, bodyonly:FALSE);
  if (res == NULL) exit(0);

  if ("webcalendar_session=deleted; expires" >< res && '<input name="login" id="user"' >< res)
  {
    postdata=string(
	  "login=nessus", unixtime(), "&",
	  "password=nessus"
    );
    req = string(
   "POST ", url, " HTTP/1.1\r\n",
	 "Host: ", get_host_name(), "\r\n",
	 "Content-Type: application/x-www-form-urlencoded\r\n",
	 "Content-Length: ", strlen(postdata), "\r\n",
	 "\r\n",
	 postdata
    );

    #display("req='", req, "'.\n");
    res = http_keepalive_send_recv(port:port, data:req, bodyonly:TRUE);
    #display("res='", res, "'.\n");
    if (res == NULL) exit(0);

    if ("Invalid login: no such user" >< res) {
	security_warning(port);
    }
  }
}