bugtraq - Source Code To Test IPv4 fragmentation --> The Rose Attack

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Date: Mon, 26 Apr 2004 21:46:28 -0500
From: Gandalf The White <gandalf@...ital.net>
To: BugTraq <bugtraq@...urityfocus.com>
Cc: Ken Hollis <gandalf@...ital.net>
Subject: Source Code To Test IPv4 fragmentation --> The Rose Attack

Greetings and Salutations:

I have updated the instructions for the Rose Fragmentation Attack and
clarified the attack (per some questions that have been asked).  The
instructions are now at the following URL:
http://digital.net/~gandalf/Rose_Frag_Attack_Explained.txt

Specifically I have added the links to two pieces of software that have been
written to test this attack:
Laurent Constantin was kind enough to program this attack from the below
somewhat unwieldy set of instructions.  The program can be found at the
following URL:
http://digital.net/~gandalf/RoseAttackv1.txt

Chuck (at) lemure.net found that he could spike the CPU of a Windows 200
machine to 100 percent with his code:
http://digital.net/~gandalf/RoseAttackv2.txt

Chuck's explanation:
I have just been playing around with the timing on the second one.  What I
have discovered is CPU only spikes for reassembling fragments for packets
that already exist (ie, if you run incre_frag once, then ctrl-c and start
again, the CPU and resources won't go through the moon).  Compiles on
redhat-9.0

If you have any questions please feel free to ask me.

Ken

---------------------------------------------------------------
Do not meddle in the affairs of wizards for they are subtle and
quick to anger.
Ken Hollis - Gandalf The White - gandalf@...ital.net - O- TINLC
WWW Page - http://digital.net/~gandalf/
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