Default Password (guest) for 'guest' Account - Nessus

Critical Plugin ID: 11256

This page contains detailed information about the Default Password (guest) for 'guest' Account Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 11256
Name: Default Password (guest) for 'guest' Account
Filename: account_guest_guest.nasl
Vulnerability Published: N/A
This Plugin Published: 2003-02-20
Last Modification Time: 2022-04-11
Plugin Version: 1.26
Plugin Type: remote
Plugin Family: Default Unix Accounts
Dependencies: account_check.nasl, find_service1.nasl, ssh_detect.nasl
Excluded KB Items [?]: global_settings/supplied_logins_only

Vulnerability Information

Severity: Critical
Vulnerability Published: N/A
Patch Published: N/A
CVE [?]: CVE-1999-0501, CVE-1999-0502
CPE [?]: N/A
Default Account Vulnerability: True

Synopsis

The remote host has an account with a default password set.

Description

The account 'guest' has the password 'guest' set. An attacker may use this to gain further privileges on this system.

Solution

Set a password for this account or disable it.

Public Exploits

Target Network Port(s): 22, 23
Target Asset(s): Services/ssh, Services/telnet
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Default Password (guest) for 'guest' Account vulnerability:

Metasploit: exploit/multi/ssh/sshexec
[SSH User Code Execution]
Metasploit: auxiliary/scanner/telnet/brocade_enable_login
[Brocade Enable Login Check Scanner]
Metasploit: auxiliary/scanner/db2/db2_auth
[DB2 Authentication Brute Force Utility]
Metasploit: auxiliary/scanner/http/dell_idrac
[Dell iDRAC Default Login]
Metasploit: auxiliary/scanner/http/dlink_dir_300_615_http_login
[D-Link DIR-300A / DIR-320 / DIR-615D HTTP Login Utility]
Metasploit: auxiliary/scanner/http/dlink_dir_615h_http_login
[D-Link DIR-615H HTTP Login Utility]
Metasploit: auxiliary/scanner/http/dlink_dir_session_cgi_http_login
[D-Link DIR-300B / DIR-600B / DIR-815 / DIR-645 HTTP Login Utility]
Metasploit: auxiliary/scanner/ftp/ftp_login
[FTP Authentication Scanner]
Metasploit: auxiliary/scanner/http/http_login
[HTTP Login Utility]
Metasploit: auxiliary/scanner/http/joomla_bruteforce_login
[Joomla Bruteforce Login Utility]
Metasploit: auxiliary/scanner/mysql/mysql_login
[MySQL Login Utility]
Metasploit: auxiliary/scanner/nntp/nntp_login
[NNTP Login Utility]
Metasploit: auxiliary/scanner/oracle/oracle_login
[Oracle RDBMS Login Utility]
Metasploit: auxiliary/scanner/pcanywhere/pcanywhere_login
[PcAnywhere Login Scanner]
Metasploit: auxiliary/scanner/postgres/postgres_login
[PostgreSQL Login Utility]
Metasploit: auxiliary/scanner/rservices/rexec_login
[rexec Authentication Scanner]
Metasploit: auxiliary/scanner/rservices/rlogin_login
[rlogin Authentication Scanner]
Metasploit: auxiliary/scanner/rservices/rsh_login
[rsh Authentication Scanner]
Metasploit: auxiliary/scanner/ssh/ssh_login
[SSH Login Check Scanner]
Metasploit: auxiliary/scanner/telnet/telnet_login
[Telnet Login Check Scanner]
Metasploit: auxiliary/scanner/http/tomcat_mgr_login
[Tomcat Application Manager Login Utility]
Metasploit: auxiliary/scanner/vmware/vmauthd_login
[VMWare Authentication Daemon Login Scanner]
Metasploit: auxiliary/scanner/vmware/vmware_http_login
[VMWare Web Login Scanner]
Metasploit: auxiliary/scanner/winrm/winrm_login
[WinRM Login Utility]
Metasploit: auxiliary/scanner/http/wordpress_xmlrpc_login
[Wordpress XML-RPC Username/Password Login Scanner]
Exploit-DB: exploits/linux/remote/35581.rb
[EDB-35581: Varnish Cache CLI Interface - Remote Code Execution (Metasploit)]
Exploit-DB: exploits/multiple/remote/41694.rb
[EDB-41694: SSH - User Code Execution (Metasploit)]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.5 (High)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS Base Score:	9.8 (Critical)
Impact Subscore:	5.9
Exploitability Subscore:	3.9
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	9.8 (Critical)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

account = "guest";
password = "guest";

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(11256);
  script_version("1.26");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-1999-0501", "CVE-1999-0502");

  script_name(english:"Default Password (guest) for 'guest' Account");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has an account with a default password set.");
  script_set_attribute(attribute:"description", value:
"The account 'guest' has the password 'guest' set. An attacker may use
this to gain further privileges on this system.");
  script_set_attribute(attribute:"solution", value:
"Set a password for this account or disable it.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'SSH User Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_publication_date", value:"2003/02/20");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"default_account", value:"true");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Default Unix Accounts");

  script_copyright(english:"This script is Copyright (C) 2003-2022 Tenable Network Security, Inc.");

  script_dependencies("find_service1.nasl", "ssh_detect.nasl", "account_check.nasl");
  script_exclude_keys("global_settings/supplied_logins_only");
  script_require_ports("Services/telnet", 23, "Services/ssh", 22);

  exit(0);
}

#
# The script code starts here : 
#
include("audit.inc");
include("default_account.inc");
include("global_settings.inc");

if (supplied_logins_only) audit(AUDIT_SUPPLIED_LOGINS_ONLY);

if (! thorough_tests && ! get_kb_item("Settings/test_all_accounts"))
 exit(0, "Neither thorough_tests nor 'Settings/test_all_accounts' is set.");

affected = FALSE;
ssh_ports = get_service_port_list(svc: "ssh", default:22);
foreach port (ssh_ports)
{
  port = check_account(login:account, password:password, port:port, svc:"ssh");
  if (port)
  {
    affected = TRUE;
    security_report_v4(port:port, severity:SECURITY_HOLE, extra:default_account_report());
  }
}
if(affected) exit(0);

telnet_ports = get_service_port_list(svc: "telnet", default:23);
foreach port (telnet_ports)
{
  port = check_account(login:account, password:password, port:port, svc:"telnet");
  if (port)
  {
    affected = TRUE;
    security_report_v4(port:port, severity:SECURITY_HOLE, extra:default_account_report());
  }
}
if(!affected) audit(AUDIT_HOST_NOT, "affected");

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/account_guest_guest.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\account_guest_guest.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/account_guest_guest.nasl

Go back to menu.

How to Run

Here is how to run the Default Password (guest) for 'guest' Account as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Default Unix Accounts plugin family.
On the right side table select Default Password (guest) for 'guest' Account plugin ID 11256.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl account_guest_guest.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a account_guest_guest.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - account_guest_guest.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state account_guest_guest.nasl -t <IP/HOST>

Go back to menu.

References

See also:

Similar and related Nessus plugins:

94374 - Default Password '12345' for 'guest' Account
11240 - Unpassworded 'guest' Account
21302 - phpBB Advanced GuestBook addentry.php phpbb_root_path Parameter Remote File Inclusion
85661 - Citrix XenServer QEMU RTL8139 Guest Network Device Information Disclosure (CTX201717)
99240 - FreeBSD : xen-kernel -- broken check in memory_exchange() permits PV guest breakout (90becf7c-1acf-11e7-970f-002590263bf5)
84710 - FreeBSD : xen-kernel -- arm: vgic: incorrect rate limiting of guest triggered logging (912cb7f7-27df-11e5-a4a5-002590263bf5)
10099 - Matt Wright guestbook.pl Arbitrary Command Execution
111682 - Security Update for Microsoft Office (Auguest 2018) (macOS)
92943 - VMware Fusion 8.1.x < 8.1.1 Shared Folders (HGFS) Guest DLL Hijacking Arbitrary Code Execution (VMSA-2016-0010)
97939 - VMware Fusion 8.x < 8.5.5 Drag-and-Drop Feature Guest-to-Host Code Execution (VMSA-2017-0005) (macOS)
118884 - VMware Fusion 10.x < 10.1.4 / 11.x < 11.0.1 vmxnet3 Guest-to-Host Code Execution Vulnerability (VMSA-2018-0027) (macOS)
58769 - Netop Remote Control dws File Handling Overflow
26919 - Microsoft Windows SMB Guest Account Local User Access
144533 - Virtuozzo 6 : qemu-guest-agent / qemu-img / qemu-kvm / etc (VZLSA-2019-1181)
144525 - Virtuozzo 6 : qemu-guest-agent / qemu-img / qemu-kvm / etc (VZLSA-2020-4056)
105782 - ESXi 5.5 / 6.0 / 6.5 / Hypervisor-Assisted Guest Remediation for Speculative Execution (VMSA-2018-0004) (Spectre) (remote check)
92944 - VMware Player 12.1.x < 12.1.1 Shared Folders (HGFS) Guest DLL Hijacking Arbitrary Code Execution (VMSA-2016-0010) (Linux)
97989 - VMware Player 12.x < 12.5.4 Drag-and-Drop Feature Guest-to-Host Code Execution (VMSA-2017-0005) (Linux)
92945 - VMware Player 12.1.x < 12.1.1 Shared Folders (HGFS) Guest DLL Hijacking Arbitrary Code Execution (VMSA-2016-0010)
97990 - VMware Player 12.x < 12.5.4 Drag-and-Drop Feature Guest-to-Host Code Execution (VMSA-2017-0005)
105784 - VMware vCenter Server 5.5.x < 5.5U3g / 6.0.x < 6.0U3d / 6.5.x < 6.5U1e Hypervisor-Assisted Guest Remediation (VMSA-2018-0004) (Spectre)
105768 - VMSA-2018-0004 : VMware vSphere, Workstation and Fusion updates add Hypervisor-Assisted Guest Remediation for speculative execution issue (Spectre)
110901 - VMSA-2018-0012 : VMware vSphere, Workstation and Fusion updates enable Hypervisor-Assisted Guest Mitigations for Speculative Store Bypass issue (Spectre)
92946 - VMware Workstation 12.1.x < 12.1.1 Shared Folders (HGFS) Guest DLL Hijacking Arbitrary Code Execution (VMSA-2016-0010) (Linux)
97940 - VMware Workstation 12.x < 12.5.4 Drag-and-Drop Feature Guest-to-Host Code Execution (VMSA-2017-0005) (Linux)
118883 - VMware Workstation 14.x < 14.1.4 / 15.x < 15.0.1 vmxnet3 Guest-to-Host Code Execution Vulnerability (VMSA-2018-0027)
92947 - VMware Workstation 12.1.x < 12.1.1 Shared Folders (HGFS) Guest DLL Hijacking Arbitrary Code Execution (VMSA-2016-0010)
97941 - VMware Workstation 12.x < 12.5.4 Drag-and-Drop Feature Guest-to-Host Code Execution (VMSA-2017-0005)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file account_guest_guest.nasl version 1.26. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Default Password (guest) for 'guest' Account - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)