OpenVPN Access Server Default Credentials (SSH)

# 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("1.3.6.1.4.1.25623.1.0.105345");
  script_version("2023-12-20T05:05:58+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("OpenVPN Access Server Default Credentials (SSH)");
  script_tag(name:"last_modification", value:"2023-12-20 05:05:58 +0000 (Wed, 20 Dec 2023)");
  script_tag(name:"creation_date", value:"2015-09-04 11:18:30 +0200 (Fri, 04 Sep 2015)");
  script_category(ACT_ATTACK);
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_dependencies("ssh_detect.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/ssh", 22);
  script_mandatory_keys("ssh/server_banner/available");
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_tag(name:"summary", value:"The remote OpenVPN Access Server is using known default credentials.");

  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 default credentials.");

  script_tag(name:"insight", value:"It was possible to login with default credentials: 'root/openvpnas'.");

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

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

  exit(0);
}

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

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

port = ssh_get_port( default:22 );

if( ssh_dont_try_login( port:port ) )
  exit( 0 );

# nb: No need to continue/start if we haven't received any banner...
if( ! ssh_get_serverbanner( port:port ) )
  exit( 0 );

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

user = "root";
pass = "openvpnas";

login = ssh_login( socket:soc, login:user, password:pass, priv:NULL, passphrase:NULL );
if( login == 0 ) {

  cmd = ssh_cmd( socket:soc, cmd:"id" );
  close( soc );

  if( "uid=0" >< cmd ) {
    security_message( port:port, data:'It was possible to login via ssh into the remote host with username "root" and password "openvpnas"' );
    exit( 0 );
  }
}

if( soc ) close( soc );

exit( 99 );