Update on land.c and Cisco

John Bashinski jbash at cisco.com
Thu Nov 27 18:15:56 UTC 1997


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A new version of the field notice covering Cisco products and land.c has
been posted at

   http://www.cisco.com/warp/public/770/land-pub.shtml

Rather than post the ever-growing full text yet again, I'll summarize the
changes:

1. The last version said that Catalyst 5000 switches were vulnerable. This
   was based on a report from a customer. We've now tried it in house and
   been unable to reproduce it. If there is in fact any vulnerability in
   the Catalyst 5000, it requires some environmental condition not present
   in our labs to trigger it.

   We will continue to investigate this until we have it nailed down.

2. Catalyst switches other than the Catalyst 5000 don't appear to be
   vulnerable... and don't share any TCP code with the 5000.

3. We have some initial results indicating some level of vulnerability
   in the BPX and IGX WAN switches and in the AXIS shelf, but only
   when they're attacked through their management ports, which typically
   aren't exposed to the Internet or other large, potentially hostile
   networks. We don't have a lot of details yet. Please read the notice
   on the Web to see what little information we do have.

There is no new information about IOS or IOS/700.

Please do me the favor of checking the full text of the advisory before
sending in any questions. We have very limited staff to deal with questions
about these notices.

Future updates, by the way, will be posted with a "From" address of
"security-alert at cisco.com".

				-- J. Bashinski
				   for security-alert at cisco.com

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