Microsoft SRV.SYS Mailslot Write Corruption - Metasploit

This page contains detailed information about how to use the auxiliary/dos/windows/smb/ms06_035_mailslot metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Module Overview

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Name: Microsoft SRV.SYS Mailslot Write Corruption
Module: auxiliary/dos/windows/smb/ms06_035_mailslot
Source code: modules/auxiliary/dos/windows/smb/ms06_035_mailslot.rb
Disclosure date: 2006-07-11
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: microsoft-ds, netbios-ssn
Target network port(s): 139, 445
List of CVEs: CVE-2006-3942

This module triggers a kernel pool corruption bug in SRV.SYS. Each call to the mailslot write function results in a two byte return value being written into the response packet. The code which creates this packet fails to consider these two bytes in the allocation routine, resulting in a slow corruption of the kernel memory pool. These two bytes are almost always set to "\xff\xff" (a short integer with value of -1).

Module Ranking and Traits

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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

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msf > use auxiliary/dos/windows/smb/ms06_035_mailslot
msf auxiliary(ms06_035_mailslot) > show targets
    ... a list of targets ...
msf auxiliary(ms06_035_mailslot) > set TARGET target-id
msf auxiliary(ms06_035_mailslot) > show options
    ... show and set options ...
msf auxiliary(ms06_035_mailslot) > exploit

Required Options

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

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Msfconsole Usage

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Here is how the dos/windows/smb/ms06_035_mailslot auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/windows/smb/ms06_035_mailslot

msf6 auxiliary(dos/windows/smb/ms06_035_mailslot) > show info

       Name: Microsoft SRV.SYS Mailslot Write Corruption
     Module: auxiliary/dos/windows/smb/ms06_035_mailslot
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2006-07-11

Provided by:
  hdm <[email protected]>

Available actions:
  Name    Description
  ----    -----------
  Attack  Run Denial of Service

Check supported:
  No

Basic options:
  Name      Current Setting  Required  Description
  ----      ---------------  --------  -----------
  MAILSLOT  Alerter          yes       The mailslot name to use
  RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT     445              yes       The SMB service port (TCP)

Description:
  This module triggers a kernel pool corruption bug in SRV.SYS. Each 
  call to the mailslot write function results in a two byte return 
  value being written into the response packet. The code which creates 
  this packet fails to consider these two bytes in the allocation 
  routine, resulting in a slow corruption of the kernel memory pool. 
  These two bytes are almost always set to "\xff\xff" (a short integer 
  with value of -1).

References:
  http://www.securityfocus.com/bid/19215
  OSVDB (27644)
  https://nvd.nist.gov/vuln/detail/CVE-2006-3942
  http://www.coresecurity.com/common/showdoc.php?idx=562&idxseccion=10
  https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2006/MS06-035

Module Options

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This is a complete list of options available in the dos/windows/smb/ms06_035_mailslot auxiliary module:

msf6 auxiliary(dos/windows/smb/ms06_035_mailslot) > show options

Module options (auxiliary/dos/windows/smb/ms06_035_mailslot):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   MAILSLOT  Alerter          yes       The mailslot name to use
   RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT     445              yes       The SMB service port (TCP)

Auxiliary action:

   Name    Description
   ----    -----------
   Attack  Run Denial of Service

Advanced Options

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Here is a complete list of advanced options supported by the dos/windows/smb/ms06_035_mailslot auxiliary module:

msf6 auxiliary(dos/windows/smb/ms06_035_mailslot) > show advanced

Module advanced options (auxiliary/dos/windows/smb/ms06_035_mailslot):

   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
   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][...]
   SMB::AlwaysEncrypt      true               yes       Enforces encryption even if the server does not require it (SMB3.x only). Note that when it is set to false, the SMB client will still encrypt the communication if the server requires it
   SMB::ChunkSize          500                yes       The chunk size for SMB segments, bigger values will increase speed but break NT 4.0 and SMB signing
   SMB::Native_LM          Windows 2000 5.0   yes       The Native LM to send during authentication
   SMB::Native_OS          Windows 2000 2195  yes       The Native OS to send during authentication
   SMB::VerifySignature    false              yes       Enforces client-side verification of server response signatures
   SMBDirect               true               no        The target port is a raw SMB service (not NetBIOS)
   SMBDomain               .                  no        The Windows domain to use for authentication
   SMBName                 *SMBSERVER         yes       The NetBIOS hostname (required for port 139 connections)
   SMBPass                                    no        The password for the specified username
   SMBUser                                    no        The username to authenticate as
   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

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This is a list of all auxiliary actions that the dos/windows/smb/ms06_035_mailslot module can do:

msf6 auxiliary(dos/windows/smb/ms06_035_mailslot) > show actions

Auxiliary actions:

   Name    Description
   ----    -----------
   Attack  Run Denial of Service

Evasion Options

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Here is the full list of possible evasion options supported by the dos/windows/smb/ms06_035_mailslot auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(dos/windows/smb/ms06_035_mailslot) > show evasion

Module evasion options:

   Name                           Current Setting  Required  Description
   ----                           ---------------  --------  -----------
   SMB::obscure_trans_pipe_level  0                yes       Obscure PIPE string in TransNamedPipe (level 0-3)
   SMB::pad_data_level            0                yes       Place extra padding between headers and data (level 0-3)
   SMB::pad_file_level            0                yes       Obscure path names used in open/create (level 0-3)
   SMB::pipe_evasion              false            yes       Enable segmented read/writes for SMB Pipes
   SMB::pipe_read_max_size        1024             yes       Maximum buffer size for pipe reads
   SMB::pipe_read_min_size        1                yes       Minimum buffer size for pipe reads
   SMB::pipe_write_max_size       1024             yes       Maximum buffer size for pipe writes
   SMB::pipe_write_min_size       1                yes       Minimum buffer size for pipe writes
   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

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This module may fail with the following 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.

Failed to write any data to the mailslot: <E>

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Here is a relevant code snippet related to the "Failed to write any data to the mailslot: <E>" error message:

72:	          return
73:	
74:	        rescue ::Exception => e
75:	
76:	          if (i == 1)
77:	            print_error("Failed to write any data to the mailslot: #{e}")
78:	            break
79:	          end
80:	          print_error("Exception occurred on interation #{i}")
81:	          print_error("Error: #{e.class} > #{e}")
82:	          break

Exception occurred on interation <I>

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Here is a relevant code snippet related to the "Exception occurred on interation <I>" error message:

75:	
76:	          if (i == 1)
77:	            print_error("Failed to write any data to the mailslot: #{e}")
78:	            break
79:	          end
80:	          print_error("Exception occurred on interation #{i}")
81:	          print_error("Error: #{e.class} > #{e}")
82:	          break
83:	        end
84:	      end
85:	

Error: <E.CLASS> > <E>

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Here is a relevant code snippet related to the "Error: <E.CLASS> > <E>" error message:

76:	          if (i == 1)
77:	            print_error("Failed to write any data to the mailslot: #{e}")
78:	            break
79:	          end
80:	          print_error("Exception occurred on interation #{i}")
81:	          print_error("Error: #{e.class} > #{e}")
82:	          break
83:	        end
84:	      end
85:	
86:	    # Errors:

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Related Pull Requests

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• #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
• #13417 Merged Pull Request: SMBv3 integration with Framework
• #13443 Merged Pull Request: Add descriptions to auxiliary modules Actions
• #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
• #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
• #6812 Merged Pull Request: Resolve #6807, remove all OSVDB references.
• #6655 Merged Pull Request: use MetasploitModule as a class name
• #6648 Merged Pull Request: Change metasploit class names
• #4768 Merged Pull Request: Reorganize SMB mixins
• #2525 Merged Pull Request: Change module boilerplate
• #1228 Merged Pull Request: MSFTIDY cleanup #1 - auxiliary

References

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• BID-19215
• OSVDB (27644)
• CVE-2006-3942
• http://www.coresecurity.com/common/showdoc.php?idx=562&idxseccion=10
• MS06-035

See Also

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Check also the following modules related to this module:

• auxiliary/dos/windows/smb/ms06_063_trans
• auxiliary/dos/windows/smb/ms05_047_pnp
• auxiliary/dos/windows/smb/ms09_001_write
• auxiliary/dos/windows/smb/ms09_050_smb2_negotiate_pidhigh
• auxiliary/dos/windows/smb/ms09_050_smb2_session_logoff
• auxiliary/dos/windows/smb/ms10_006_negotiate_response_loop
• auxiliary/dos/windows/smb/ms10_054_queryfs_pool_overflow
• auxiliary/dos/windows/smb/ms11_019_electbowser
• auxiliary/dos/windows/smb/rras_vls_null_deref
• auxiliary/dos/windows/smb/vista_negotiate_stop
• auxiliary/dos/windows/smtp/ms06_019_exchange
• exploit/windows/browser/ms06_001_wmf_setabortproc
• exploit/windows/browser/ms06_013_createtextrange
• exploit/windows/browser/ms06_055_vml_method
• exploit/windows/browser/ms06_057_webview_setslice
• exploit/windows/browser/ms06_067_keyframe
• exploit/windows/browser/ms06_071_xml_core
• exploit/windows/smb/ms06_025_rasmans_reg
• exploit/windows/smb/ms06_025_rras
• exploit/windows/smb/ms06_040_netapi
• exploit/windows/smb/ms06_066_nwapi
• exploit/windows/smb/ms06_066_nwwks
• exploit/windows/smb/ms06_070_wkssvc

Authors

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• hdm

Version

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This page has been produced using Metasploit Framework version 6.1.28-dev. For more modules, visit the Metasploit Module Library.

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