ZeroShell Default Credentials (SSH)

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.0.108946");
  script_version("2025-11-11T05:40:18+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_tag(name:"last_modification", value:"2025-11-11 05:40:18 +0000 (Tue, 11 Nov 2025)");
  script_tag(name:"creation_date", value:"2020-10-19 10:28:09 +0000 (Mon, 19 Oct 2020)");
  script_name("ZeroShell Default Credentials (SSH)");
  script_category(ACT_ATTACK);
  script_family("Default Accounts");
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_dependencies("ssh_detect.nasl", "gb_default_credentials_options.nasl");
  script_require_ports("Services/ssh", 22);
  script_mandatory_keys("ssh/openssh/detected"); # nb: Versions 1.0 up to 3.9 are using OpenSSH
  script_exclude_keys("default_credentials/disable_default_account_checks");

  script_xref(name:"URL", value:"https://zeroshell.org/faq/generic/");

  script_tag(name:"summary", value:"The remote ZeroShell system is using known default credentials
  for the SSH login.");

  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:"Tries to login using the default credentials:
  'admin:zeroshell'.");

  script_tag(name:"affected", value:"All ZeroShell systems using known default credentials.");

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

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

  exit(0);
}

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

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

port = ssh_get_port( default:22 );

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

banner = ssh_get_serverbanner( port:port );
if( ! banner || banner !~ "OpenSSH" )
  exit( 0 );

creds = make_list( "admin:zeroshell" );
pattern = "(Z e r o S h e l l|Z E R O S H E L L|COMMAND MENU)";
report = 'It was possible to login to the remote ZeroShell system via SSH with the following known credentials:\n';

foreach cred( creds ) {

  if( ! soc = open_sock_tcp( port ) )
    continue;

  split = split( cred, sep:":", keep:FALSE );
  if( max_index( split ) != 2 ) {
    close( soc );
    continue;
  }

  username = split[0];
  password = split[1];

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

    cmd = ssh_cmd( socket:soc, cmd:"test" );

    if( match = egrep( pattern:pattern, string:cmd ) ) {
      vuln = TRUE;
      report += '\nUsername: "' + username  + '", Password: "' + password + '"';
      report += '\nProof:\n\n' + chomp( match );
    }
  }
  close( soc );
}

if( vuln ) {
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );