bugtraq - Re: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory

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Date: 7 Aug 2006 22:24:13 -0000
From: henry.sieff@...il.com
To: bugtraq@...urityfocus.com
Subject: Re: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory

Cisco recommends a workaround which essentially sets a limit on the number of outstanding SA's and drops new SA requests if they exceed that limit (outlined in http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a0080229125.html)

It seems to me that this will not accomplish much - presumably the determined attacker will simply continue to send packets - as soon as the number of SA'ss drops below that limit the attacker will simply fill up the queue again. Am I missing something about the vulnerability or the supposed fix from Cisco?