North American Network Operators Group
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Re: TCP-ACK vulnerability (was RE: SSH on the router)

  • From: Alexei Roudnev
  • Date: Thu Jun 10 02:35:21 2004 
This is minor exploit - usually you set up VLAN1 interface with IP addres,
which is filterd out from outside. Moreover, there is not any good way to
find switch IP - it is transparent for user's devices.


>
> On Mon, 7 Jun 2004, McBurnett, Jim wrote:
> > Aside from that, Use ACL's out the wazoo on the VTY lines and limit
access to
> > that to say 1 SSH enabled router or 1 IPSEC enabled router...
>
> It doesn't really matter if you use SSH, Telnet or HTTP; if you can send
> evil packets to the router/switch and it falls over and dies.
>
> http://www.cisco.com/warp/public/707/cisco-sa-20040609-catos.shtml
>
> IP Permit Lists will not provide any mitigation against this
vulnerability.
>
> The race is on, who will find your switches first?
>