Microsoft SQL Server Escalate EXECUTE AS - Metasploit


This page contains detailed information about how to use the auxiliary/admin/mssql/mssql_escalate_execute_as metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

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Module Overview

Name: Microsoft SQL Server Escalate EXECUTE AS
Module: auxiliary/admin/mssql/mssql_escalate_execute_as
Source code: modules/auxiliary/admin/mssql/mssql_escalate_execute_as.rb
Disclosure date: -
Last modification time: 2020-09-22 02:56:51 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: ms-sql2000, ms-sql-s, sybase
Target network port(s): 1433, 1434, 1435, 2533, 2638, 9152, 14330
List of CVEs: -

This module can be used escalate privileges if the IMPERSONATION privilege has been assigned to the user. In most cases, this results in additional data access, but in some cases it can be used to gain sysadmin privileges.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

msf > use auxiliary/admin/mssql/mssql_escalate_execute_as
msf auxiliary(mssql_escalate_execute_as) > show targets
    ... a list of targets ...
msf auxiliary(mssql_escalate_execute_as) > set TARGET target-id
msf auxiliary(mssql_escalate_execute_as) > show options
    ... show and set options ...
msf auxiliary(mssql_escalate_execute_as) > exploit

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

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Msfconsole Usage

Here is how the admin/mssql/mssql_escalate_execute_as auxiliary module looks in the msfconsole:

msf6 > use auxiliary/admin/mssql/mssql_escalate_execute_as

msf6 auxiliary(admin/mssql/mssql_escalate_execute_as) > show info

       Name: Microsoft SQL Server Escalate EXECUTE AS
     Module: auxiliary/admin/mssql/mssql_escalate_execute_as
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  nullbind <[email protected]>

Check supported:
  No

Basic options:
  Name                 Current Setting  Required  Description
  ----                 ---------------  --------  -----------
  PASSWORD                              no        The password for the specified username
  RHOSTS                                yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT                1433             yes       The target port (TCP)
  TDSENCRYPTION        false            yes       Use TLS/SSL for TDS data "Force Encryption"
  USERNAME             sa               no        The username to authenticate as
  USE_WINDOWS_AUTHENT  false            yes       Use windows authentification (requires DOMAIN option set)

Description:
  This module can be used escalate privileges if the IMPERSONATION 
  privilege has been assigned to the user. In most cases, this results 
  in additional data access, but in some cases it can be used to gain 
  sysadmin privileges.

References:
  http://msdn.microsoft.com/en-us/library/ms178640.aspx

Module Options

This is a complete list of options available in the admin/mssql/mssql_escalate_execute_as auxiliary module:

msf6 auxiliary(admin/mssql/mssql_escalate_execute_as) > show options

Module options (auxiliary/admin/mssql/mssql_escalate_execute_as):

   Name                 Current Setting  Required  Description
   ----                 ---------------  --------  -----------
   PASSWORD                              no        The password for the specified username
   RHOSTS                                yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT                1433             yes       The target port (TCP)
   TDSENCRYPTION        false            yes       Use TLS/SSL for TDS data "Force Encryption"
   USERNAME             sa               no        The username to authenticate as
   USE_WINDOWS_AUTHENT  false            yes       Use windows authentification (requires DOMAIN option set)

Advanced Options

Here is a complete list of advanced options supported by the admin/mssql/mssql_escalate_execute_as auxiliary module:

msf6 auxiliary(admin/mssql/mssql_escalate_execute_as) > show advanced

Module advanced options (auxiliary/admin/mssql/mssql_escalate_execute_as):

   Name                    Current Setting                                                       Required  Description
   ----                    ---------------                                                       --------  -----------
   CHOST                                                                                         no        The local client address
   CPORT                                                                                         no        The local client port
   ConnectTimeout          10                                                                    yes       Maximum number of seconds to establish a TCP connection
   DOMAIN                  WORKSTATION                                                           yes       The domain to use for windows authentication
   HEX2BINARY              /opt/metasploit-framework/embedded/framework/data/exploits/mssql/h2b  no        The path to the hex2binary script on the disk
   NTLM::SendLM            true                                                                  yes       Always send the LANMAN response (except when NTLMv2_session is specified)
   NTLM::SendNTLM          true                                                                  yes       Activate the 'Negotiate NTLM key' flag, indicating the use of NTLM responses
   NTLM::SendSPN           true                                                                  yes       Send an avp of type SPN in the ntlmv2 client blob, this allows authentication on Windows 7+/Server 2008 R2+ when SPN is required
   NTLM::UseLMKey          false                                                                 yes       Activate the 'Negotiate Lan Manager Key' flag, using the LM key when the LM response is sent
   NTLM::UseNTLM2_session  true                                                                  yes       Activate the 'Negotiate NTLM2 key' flag, forcing the use of a NTLMv2_session
   NTLM::UseNTLMv2         true                                                                  yes       Use NTLMv2 instead of NTLM2_session when 'Negotiate NTLM2' key is true
   Proxies                                                                                       no        A proxy chain of format type:host:port[,type:host:port][...]
   SSL                     false                                                                 no        Negotiate SSL/TLS for outgoing connections
   SSLCipher                                                                                     no        String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
   SSLVerifyMode           PEER                                                                  no        SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
   SSLVersion              Auto                                                                  yes       Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1
                                                                                                           .2)
   VERBOSE                 false                                                                 no        Enable detailed status messages
   WORKSPACE                                                                                     no        Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the admin/mssql/mssql_escalate_execute_as module can do:

msf6 auxiliary(admin/mssql/mssql_escalate_execute_as) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the admin/mssql/mssql_escalate_execute_as auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(admin/mssql/mssql_escalate_execute_as) > show evasion

Module evasion options:

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   TCP::max_send_size  0                no        Maxiumum tcp segment size.  (0 = disable)
   TCP::send_delay     0                no        Delays inserted before every send.  (0 = disable)

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Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

Login was unsuccessful. Check your credentials.

Here is a relevant code snippet related to the "Login was unsuccessful. Check your credentials." error message:

25:	    # Check connection and issue initial query
26:	    print_status("Attempting to connect to the database server at #{rhost}:#{rport} as #{datastore['USERNAME']}...")
27:	    if mssql_login_datastore
28:	      print_good('Connected.')
29:	    else
30:	      print_error('Login was unsuccessful. Check your credentials.')
31:	      disconnect
32:	      return
33:	    end
34:	
35:	    # Query for sysadmin status

You're NOT a sysadmin, let's try to change that.

Here is a relevant code snippet related to the "You're NOT a sysadmin, let's try to change that." error message:

40:	    if user_status == 1
41:	      print_good("#{datastore['USERNAME']} has the sysadmin role, no escalation required.")
42:	      disconnect
43:	      return
44:	    else
45:	      print_status("You're NOT a sysadmin, let's try to change that.")
46:	    end
47:	
48:	    # Get a list of the users that can be impersonated
49:	    print_status("Enumerating a list of users that can be impersonated...")
50:	    imp_user_list = check_imp_users

Sorry, the current user doesn't have permissions to impersonate anyone.

Here is a relevant code snippet related to the "Sorry, the current user doesn't have permissions to impersonate anyone." error message:

47:	
48:	    # Get a list of the users that can be impersonated
49:	    print_status("Enumerating a list of users that can be impersonated...")
50:	    imp_user_list = check_imp_users
51:	    if imp_user_list.nil? || imp_user_list.length == 0
52:	      print_error('Sorry, the current user doesn\'t have permissions to impersonate anyone.')
53:	      disconnect
54:	      return
55:	    else
56:	      # Display list of users that can be impersonated
57:	      print_good("#{imp_user_list.length} users can be impersonated:")

Sorry, none of the users that can be impersonated are sysadmins.

Here is a relevant code snippet related to the "Sorry, none of the users that can be impersonated are sysadmins." error message:

62:	
63:	    # Check if any of the users that can be impersonated are sysadmins
64:	    print_status('Checking if any of them are sysadmins...')
65:	    imp_user_sysadmin = check_imp_sysadmin(imp_user_list)
66:	    if imp_user_sysadmin.nil?
67:	      print_error('Sorry, none of the users that can be impersonated are sysadmins.')
68:	      disconnect
69:	      return
70:	    end
71:	
72:	    # Attempt to escalate to sysadmin

Fail buckets, something went wrong.

Here is a relevant code snippet related to the "Fail buckets, something went wrong." error message:

76:	      # Check if escalation was successful
77:	      user_status = check_sysadmin
78:	      if user_status == 1
79:	        print_good("Congrats, #{datastore['USERNAME']} is now a sysadmin!.")
80:	      else
81:	        print_error('Fail buckets, something went wrong.')
82:	      end
83:	    else
84:	      print_error('Error while trying to escalate privileges.')
85:	    end
86:

Error while trying to escalate privileges.

Here is a relevant code snippet related to the "Error while trying to escalate privileges." error message:

79:	        print_good("Congrats, #{datastore['USERNAME']} is now a sysadmin!.")
80:	      else
81:	        print_error('Fail buckets, something went wrong.')
82:	      end
83:	    else
84:	      print_error('Error while trying to escalate privileges.')
85:	    end
86:	
87:	    disconnect
88:	    return
89:	  end

<IMP_USER:0> is NOT sysadmin!

Here is a relevant code snippet related to the "<IMP_USER:0> is NOT sysadmin!" error message:

134:	      status = parse_results[0][0]
135:	      if status == 1
136:	        print_good(" - #{imp_user[0]} is a sysadmin!")
137:	        return imp_user
138:	      else
139:	        print_status(" - #{imp_user[0]} is NOT sysadmin!")
140:	      end
141:	    end
142:	    nil
143:	  end
144:

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References

See Also

Check also the following modules related to this module:

Authors

  • nullbind <scott.sutherland[at]netspi.com>

Version

This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.

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