Warning: Cisco RW community backdoor.

Tue Feb 27 16:48:08 UTC 2001

It applies to 12.0 and later, so testing it on an 11.x router doesn't
help.

Owen

> 
> 
> It appears that 2500 are not affected.
> 
> The fix below doesn't work on 11.1 and 11.2 , you have to turn snmp off by
> the looks.
> 
> have fun.
> 
> ----- Forwarded message from "James A. T. Rice" <jamesr at rd.bbc.co.uk> -----
> 
> Date: Tue, 27 Feb 2001 00:39:38 +0000 (GMT)
> From: "James A. T. Rice" <jamesr at rd.bbc.co.uk>
> X-Sender:  <jamesr at inet15>
> To: <members at lonap.net>, <ops at linx.net>
> Subject: Warning: Cisco RW community backdoor.
> Precedence: bulk
> 
> If your router responds to `snmpwalk router.isp.net.uk ILMI`, you
> probabally will want to do the following to disable it:
>    conf t
>    snmp-server community ILMI RO 99
>    access-list 99 deny any log
> (pick another spare access-list if 99 isn't available)
> 
> If you dont, assuming your ios/hardware combination supports it,
> (most of the bigger routers do) anyone can do things like:
>           `snmpset router.isp.net.uk ILMI system.sysName.0 s \
>           "ALL YOUR ROUTER ARE BELONG TO US."`
> Thats a harmless example. You can do almost anything with RW snmp.
> 
> Warm Regards
> James
> 
> -- 
> James A. T. Rice             | Email: jamesr at rd.bbc.co.uk
> Internet Operations Engineer | Phone: 01737 839 737
> BBC Internet Services, Kingswood Warren, Tadworth, Surrey, UK.
> 
> ----- End forwarded message -----
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