Monkey HTTPD Header Parsing Denial of Service (DoS) - Metasploit


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

Table Of Contents
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Module Overview

Name: Monkey HTTPD Header Parsing Denial of Service (DoS)
Module: auxiliary/dos/http/monkey_headers
Source code: modules/auxiliary/dos/http/monkey_headers.rb
Disclosure date: 2013-05-30
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 2001
List of CVEs: CVE-2013-3843

This module causes improper header parsing that leads to a segmentation fault due to a specially crafted HTTP request. Affects version <= 1.2.0.

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

msf6 > use auxiliary/dos/http/monkey_headers

msf6 auxiliary(dos/http/monkey_headers) > show info

       Name: Monkey HTTPD Header Parsing Denial of Service (DoS)
     Module: auxiliary/dos/http/monkey_headers
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2013-05-30

Provided by:
  Doug Prostko <[email protected]>

Check supported:
  No

Basic options:
  Name    Current Setting  Required  Description
  ----    ---------------  --------  -----------
  RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT   2001             yes       The target port (TCP)

Description:
  This module causes improper header parsing that leads to a 
  segmentation fault due to a specially crafted HTTP request. Affects 
  version <= 1.2.0.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2013-3843
  OSVDB (93853)
  http://www.securityfocus.com/bid/60333

Module Options

This is a complete list of options available in the dos/http/monkey_headers auxiliary module:

msf6 auxiliary(dos/http/monkey_headers) > show options

Module options (auxiliary/dos/http/monkey_headers):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   2001             yes       The target port (TCP)

Advanced Options

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

msf6 auxiliary(dos/http/monkey_headers) > show advanced

Module advanced options (auxiliary/dos/http/monkey_headers):

   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/http/monkey_headers module can do:

msf6 auxiliary(dos/http/monkey_headers) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(dos/http/monkey_headers) > 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.

<RHOST>:<RPORT> - Server is still alive

Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Server is still alive" error message:

61:	
62:	    print_status("#{rhost}:#{rport} - Checking server status...")
63:	    select(nil, nil, nil, 1)
64:	
65:	    if is_alive?
66:	      print_error("#{rhost}:#{rport} - Server is still alive")
67:	    else
68:	      print_good("#{rhost}:#{rport} - Connection Refused: Success!")
69:	    end
70:	  end
71:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • Doug Prostko <dougtko[at]gmail.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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