Bugtraq mailing list archives
RE: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory
From: "Lance Seelbach" <lance () bekinc net>
Date: Fri, 11 Aug 2006 12:57:58 -0400
In reviewing the "fine print" of the Cisco response, their recommendations fall in the category of a workaround, since the underlying "vulnerability" is really a flaw in the IKE protocol. Fix the protocol and you can fix the "vulnerability". But that would require that every vendor who uses IKE to make changes too, which seems to make this a much broader issue than Cisco. L -----Original Message----- From: henry.sieff () gmail com 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?
Current thread:
- Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory Roy Hills (Aug 02)
- <Possible follow-ups>
- Re: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory henry . sieff (Aug 11)
- RE: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory Lance Seelbach (Aug 14)
- Re: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory Henry Sieff (Aug 11)
- RE: Re: Cisco VPN Concentrator IKE resource exhaustion DoS Advisory Lance Seelbach (Aug 14)