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

Dale W. Carder dwcarder at wisc.edu
Thu Feb 11 18:06:08 UTC 2016


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


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