[c-nsp] 3750 and CVE-2018-0167

[Sebastian Beutel]

Hi Chuck,

On Mon, Jun 04, 2018 at 07:46:56PM -0400, Chuck Church wrote:
>
> Cisco might be willing to do that, but I think they'd much rather you buy a
> new switch.  I have seen them offer updates beyond end of security patch
> dates, but it's usually for larger chassis such as 6500s.  
>
It's not that we want to keep these old switches. We're allready replaced
most of them with 3850, we are still doing so and planned to to be done at
the end of 2018. As our 3750 turned out to be pretty stable workhorses this
seems like a doable thing. But now, with CVE-2018-0167 in mind, that date is
now pretty far in the future. As we know of the wide spread of 3750 we
believe that we are not the only customers having this sort of problem. In
my ears cisco is telling me here: "We fucked up but now it's your problem
replacing about a hundred switches over night"
   As we assume that cisco will announce end of live of 3850 maybe in 2019
we need to decide what plattform will be next. Ciscos current software
quality combined with the new port based licence model of 9k and experiences
like this summ up to a hard decision. 

Best,
     Sebastian.
 
> 
> -----Original Message-----
> From: Sebastian Beutel <sebastian.beutel at rus.uni-stuttgart.de> 
> Sent: Monday, June 04, 2018 1:15 PM
> To: Chuck Church <chuckchurch at gmail.com>
> Cc: Brian Turnbow <b.turnbow at twt.it>; NSP - Cisco
> <cisco-nsp at puck.nether.net>
> Subject: Re: [c-nsp] 3750 and CVE-2018-0167
> 
> Hi Chuck,
> 
> On Mon, Jun 04, 2018 at 11:41:52AM -0400, Chuck Church wrote:
> >
> > I thought with LLDP you can turn off receive and transmit of LLDP 
> > messages separately.  If you disable the receipt of them and only 
> > transmit, does that address the issue?
> >
> The security advisory mentioned no workaround. Maybe this could help and we
> will definitively give it a try. Maybe we even find an exploit to test it.
> Thanks for the suggestion.
> 
> >
> > These switches are end of all support dates. They most surely won't 
> > address this bug.
> >
> I know. End of shipping was 2013 and end of security was 2016. But as this
> plattform is still widely useed, my naive hope was, that Cisco could utilise
> this issue to demonstrate the world that they offer the benefits of a
> premium class vendor that doesn't sell their customers down the river, even
> if their product is long out of sale. 
> 
> Best,
>    Sebastian.
>  
> > 
> > On Mon, Jun 4, 2018 at 5:54 AM, Sebastian Beutel < 
> > sebastian.beutel at rus.uni-stuttgart.de> wrote:
> > 
> > > Hi Brian,
> > >
> > > On Thu, May 31, 2018 at 07:03:23PM +0200, Brian Turnbow wrote:
> > > >
> > > > We don't use lldp, but you can turn it off on an interface by 
> > > > interface bassis.
> > > >
> > > We need lldp because our ip phones learn their voice vlan via lldp. 
> > > We can't define dedicated phone ports because people are used to 
> > > plug in their phone wherever they choose to.
> > >
> > > >
> > > > Why run it on ports with devices outside of your control?
> > > >
> > > We didn't choose so. Universities had byod long before it had a name...
> > >
> > > Best,
> > >     Sebastian.
> > >
> > > >
> > > > > -----Original Message-----
> > > > > From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On 
> > > > > Behalf
> > > Of
> > > > > Sebastian Beutel
> > > > > Sent: mercoledì 30 maggio 2018 17:52
> > > > > To: cisco-nsp at puck.nether.net
> > > > > Subject: [c-nsp] 3750 and CVE-2018-0167
> > > > >
> > > > > Dear list,
> > > > >
> > > > >     we're still having some Cat 3750 in operation and it will 
> > > > > still
> > > take
> > > > some time
> > > > > till we can retire the last ones. We've asked Cisco whether they 
> > > > > are
> > > > planning
> > > > > to publish a new software image for this platform that fixes
> > > > > CVE-2018-0167 despite the fact that the product is way beyond 
> > > > > end of security and vulnerability support.
> > > > >     Our Cisco representative stated that they are not planning 
> > > > > to do so
> > > > despite
> > > > > the severity of the bug. He also said we're the only customer 
> > > > > having
> > > > this issue.
> > > > > So my question is: If you're still running 3750s, how do you 
> > > > > deal with
> > > > this?
> > > > >
> > > > > Best,
> > > > >    Sebastian.
> > > > >
> > > > > P.S.: Cisco's advisory:
> > > > >
> > > > https://tools.cisco.com/security/center/content/
> > > CiscoSecurityAdvisory/cisco-sa-20180328-lldp
> > >
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> > >
> 
>