Cisco vulnerability and dangerous filtering techniques

Tue Jul 22 18:03:26 UTC 2003

In our case we use some older routers as managment devices...  Not
critical to the core unless there is some larger outage...  Those
devices are old enough that they can't handle a newer rev of code... 
ACL's are the only answer there..

Luckily they have very little traffic even under heavy use, so ACL's
don't hurt as much, but still something we need to be aware of..

On Tue, 2003-07-22 at 13:58, Allan Liska wrote:
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> On 22 Jul 2003, Jason Frisvold wrote:
> > 
> > Not only the "clueless", but how about those of us who deploy older
> > routers sometime in the future with legitimate uses?  What happens when
> > we "forget" that this bug exists?  Now we have to go through the process
> > of adding a "don't forget the IPV4 Cisco Bug" clause to our procedures..
> > 
> > 
> 
> You don't need to add that clause as long as you maintain a set of 
> baseline configurations.  If you deploy all routers with the same code, or 
> as close to it as possible, then you don't have to remember individual 
> security alerts, because as you update the code on your existing routers, 
> you should be creating a new baseline that should be installed on all 
> newly deployed routers.
> 
> 
> allan
> - -- 
> Allan Liska
> allan at allan.org
> http://www.allan.org
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-- 
---------------------------
Jason H. Frisvold
Backbone Engineering Supervisor
Penteledata Engineering
friz at corp.ptd.net
RedHat Engineer - RHCE # 807302349405893
Cisco Certified - CCNA # CSCO10151622
MySQL Core Certified - ID# 205982910
---------------------------
"Imagination is more important than knowledge.
Knowledge is limited. Imagination encircles
the world."
      -- Albert Einstein [1879-1955]
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