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Re: Warning: Cisco RW community backdoor.
- From: Owen DeLong
- Date: Tue Feb 27 11:57:33 2001
It applies to 12.0 and later, so testing it on an 11.x router doesn't
> 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" <email@example.com> -----
> Date: Tue, 27 Feb 2001 00:39:38 +0000 (GMT)
> From: "James A. T. Rice" <firstname.lastname@example.org>
> X-Sender: <jamesr@inet15>
> To: <email@example.com>, <firstname.lastname@example.org>
> 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 A. T. Rice | Email: email@example.com
> Internet Operations Engineer | Phone: 01737 839 737
> BBC Internet Services, Kingswood Warren, Tadworth, Surrey, UK.
> ----- End forwarded message -----
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