OTRS Default Credentials (HTTP)

###############################################################################
# OpenVAS Vulnerability Test
#
# OTRS Default Credentials (HTTP)
#
# Authors:
# Christian Fischer <[email protected]>
#
# Copyright:
# Copyright (C) 2018 Greenbone Networks GmbH
#
# 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:otrs:otrs";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108465");
  script_version("2020-04-15T09:02:26+0000");
  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_tag(name:"last_modification", value:"2020-04-15 09:02:26 +0000 (Wed, 15 Apr 2020)");
  script_tag(name:"creation_date", value:"2018-09-18 10:26:26 +0200 (Tue, 18 Sep 2018)");
  script_name("OTRS Default Credentials (HTTP)");
  script_category(ACT_ATTACK);
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2018 Greenbone Networks GmbH");
  script_dependencies("secpod_otrs_detect.nasl", "gb_default_credentials_options.nasl");
  script_mandatory_keys("OTRS/installed");
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_tag(name:"summary", value:"The OTRS instance is using known
  and default credentials for the HTTP based web interface.");

  script_tag(name:"impact", value:"This issue may be exploited by a remote attacker to
  gain access to sensitive information or modify system configuration.");

  script_tag(name:"vuldetect", value:"Try to login with known credentials.");

  script_tag(name:"solution", value:"Change the password.");

  script_tag(name:"solution_type", value:"Workaround");
  script_tag(name:"qod_type", value:"remote_app");

  exit(0);
}

if(get_kb_item("default_credentials/disable_default_account_checks"))
  exit(0);

# nb: Tested with OTRS 5.0.16 and 3.3.9 from Debian stretch and jessie as well
# as the latest 6.0.10 from https://hub.docker.com/r/juanluisbaptiste/otrs/ which
# should provide a broad coverage of deployed versions.

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

# nb: The installer of OTRS 5+ is enforcing to set a new password (while keeping the root@localhost username)
# instead of the default of "root" but there might be migrated instances still using this one.
# TBD: We could also allow to inject additional default credentials here (e.g. via default_credentials.inc)...
# nb: The array key is currently using an uppercase "R" as to have be able to have two different possible keys with different passwords.
creds = make_array( "root@localhost", "root", # Default in OTRS < 5 http://doc.otrs.com/doc/manual/admin/4.0/en/html/first-login.html
                    "Root@localhost", "changeme" ); # Default of docker container https://hub.docker.com/r/juanluisbaptiste/otrs/

if( ! port = get_app_port( cpe:CPE, service:"www" ) ) exit( 0 );
if( ! dir = get_app_location( cpe:CPE, port:port ) ) exit( 0 );
if( dir == "/" ) dir = "";
url = dir + "/index.pl";

foreach cred( keys( creds ) ) {

  data = "Action=Login&RequestedURL=&Lang=en&TimeOffset=-120&User=" + tolower( cred ) + "&Password=" + creds[cred];
  add_headers = make_array( "Cookie", "OTRSBrowserHasCookie=1", "Content-Type", "application/x-www-form-urlencoded" );

  req = http_post_put_req( port:port, url:url, data:data, add_headers:add_headers );
  res = http_keepalive_send_recv( port:port, data:req, bodyonly:FALSE );
  auth_token = http_get_cookie_from_header( buf:res, pattern:"OTRSAgentInterface=([^; ]+)" );
  if( isnull( auth_token ) ) continue;

  req = http_get_req( port:port, url:url, add_headers:make_array( "Cookie", "OTRSAgentInterface=" + auth_token ) );
  res = http_keepalive_send_recv( port:port, data:req, bodyonly:FALSE );

  # <title>Dashboard -  OTRS</title>
  # <title>Dashboard -  OTRS 5s</title>
  #
  #            You are logged in as
  #            <a href="/otrs/index.pl?Action=AgentPreferences" title="Edit personal preferences">Admin OTRS</a>
  #
  # title="Logout (You are logged in as Admin OTRS)"
  # and one line below just:
  # Logout (You are logged in as Admin OTRS)
  if( res =~ "^HTTP/1\.[01] 200" && ( "Logout (You are logged in as Admin OTRS)" >< res || res =~ "<title>Dashboard.*OTRS.*</title>" || res =~ "You are logged in as.*>Admin OTRS</a>" ) ) {
    report  = "It was possible to log in to the administrative web interface at '" + http_report_vuln_url( port:port, url:url, url_only:TRUE );
    report += "' using the default user '" + tolower( cred ) + "' with the default password '" + creds[cred] + "'.";
    security_message( port:port, data:report );
    exit( 0 );
  }
}

exit( 99 );