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Re: Re: Are Fragmentation Attacks Still Used for IDS/IPS Evasion?

from [vijay . upadhyaya] Network Security [Permanent Link]
Subject: Re: Re: Are Fragmentation Attacks Still Used for IDS/IPS Evasion?
Date: 30 Sep 2007 05:29:27 -0000 
Oh yea, FRAGROUTE and similar tools are still being used to bypass the IDS/IPS 
. 
Unfortunately problem is far more complex, when we add Fragmentation to any 
simple attack. 
Success criteria for any Security measures depends  on Simplicity, feasibility 
and performance.

In my experience I have found blocking the Fragmented packets at the Gateway as 
the best solution. Sure you will have trouble with VPN  but that issue can be 
resolved by proper network architecture having VPN gateway coming through 
different firewall and allowing only VPN traffic through and Fragmented packets 
will be allowed. 

There was a paper on Internet with some statistics on how much percentage of  
traffic on the Internet is fragmented . 

Hope this helps.
Regards, 
Vijay Upadhyaya 

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