Sendmail SMTP Address prescan Memory Corruption - Metasploit


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

Table Of Contents
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Module Overview

Name: Sendmail SMTP Address prescan Memory Corruption
Module: auxiliary/dos/smtp/sendmail_prescan
Source code: modules/auxiliary/dos/smtp/sendmail_prescan.rb
Disclosure date: 2003-09-17
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: smtp, smtps
Target network port(s): 25, 465, 587, 2525, 25000, 25025
List of CVEs: CVE-2003-0694

This is a proof of concept denial of service module for Sendmail versions 8.12.8 and earlier. The vulnerability is within the prescan() method when parsing SMTP headers. Due to the prescan function, only 0x5c and 0x00 bytes can be used, limiting the likelihood for arbitrary 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/smtp/sendmail_prescan
msf auxiliary(sendmail_prescan) > show targets
    ... a list of targets ...
msf auxiliary(sendmail_prescan) > set TARGET target-id
msf auxiliary(sendmail_prescan) > show options
    ... show and set options ...
msf auxiliary(sendmail_prescan) > 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/smtp/sendmail_prescan auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/smtp/sendmail_prescan

msf6 auxiliary(dos/smtp/sendmail_prescan) > show info

       Name: Sendmail SMTP Address prescan Memory Corruption
     Module: auxiliary/dos/smtp/sendmail_prescan
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2003-09-17

Provided by:
  aushack <[email protected]>

Check supported:
  No

Basic options:
  Name      Current Setting     Required  Description
  ----      ---------------     --------  -----------
  MAILFROM  [email protected]  yes       FROM address of the e-mail
  MAILTO    [email protected]  yes       TO address of the e-mail
  RHOSTS                        yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT     25                  yes       The target port (TCP)

Description:
  This is a proof of concept denial of service module for Sendmail 
  versions 8.12.8 and earlier. The vulnerability is within the 
  prescan() method when parsing SMTP headers. Due to the prescan 
  function, only 0x5c and 0x00 bytes can be used, limiting the 
  likelihood for arbitrary code execution.

References:
  OSVDB (2577)
  https://nvd.nist.gov/vuln/detail/CVE-2003-0694
  http://www.securityfocus.com/bid/8641
  https://www.exploit-db.com/exploits/24

Module Options

This is a complete list of options available in the dos/smtp/sendmail_prescan auxiliary module:

msf6 auxiliary(dos/smtp/sendmail_prescan) > show options

Module options (auxiliary/dos/smtp/sendmail_prescan):

   Name      Current Setting     Required  Description
   ----      ---------------     --------  -----------
   MAILFROM  [email protected]  yes       FROM address of the e-mail
   MAILTO    [email protected]  yes       TO address of the e-mail
   RHOSTS                        yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT     25                  yes       The target port (TCP)

Advanced Options

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

msf6 auxiliary(dos/smtp/sendmail_prescan) > show advanced

Module advanced options (auxiliary/dos/smtp/sendmail_prescan):

   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
   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 dos/smtp/sendmail_prescan module can do:

msf6 auxiliary(dos/smtp/sendmail_prescan) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(dos/smtp/sendmail_prescan) > 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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References

See Also

Check also the following modules related to this module:

Related Nessus plugins:

Authors

  • aushack

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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