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[c-nsp] Cisco Security Advisory: Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability


First, understand how it's done, then maybe you can think of something.

If you are stopping IKE with ACL's, you probably need to address NAT-T as
well (udp:4500).
But if you are doing that, you probably don't need IKE active at the ASA,
so just disabling it all together will probably do the trick.?

Best regards
arco Teixeira

On Thu, Feb 11, 2016 at 6:06 PM, Dale W. Carder <dwcarder at wisc.edu> wrote:

> Thus spake Andrew (Andy) Ashley (andrew.a at aware.co.th) on Thu, Feb 11,
> 2016 at 02:35:51PM +0000:
> > Is a control-plane ACL to limit isakmp traffic (UDP/500) to an affected
> ASA from desired sources enough to mitigate this attack, until upgrades can
> be performed?
> It's worth noting that is not listed as a workaround (they typically use
> branding like "infrastructure acl's" or some such) to mitigate it on the
> affected box.  Upstream, yes that would seem to be intuitive.
> Perhaps because you are corrupting the heap with fragments you are
> outside of where the ACL is applied?
> Dale