full-disclosure - Cisco IOS Shellcode Presentation

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Date: Fri Jul 29 21:03:17 2005
From: mmadison at fnni.com (Madison, Marc)
Subject: Cisco IOS Shellcode Presentation

 Am I missing something here, because it seems that two vulnerabilities
are being discussed, one is the IPv6 DOS
http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml.  And
the other is Lynn presentation on shellcode execution via the IOS?

-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk
[mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Geo.
Sent: Friday, July 29, 2005 2:57 PM
To: full-disclosure@...ts.grok.org.uk
Subject: RE: [Full-disclosure] Cisco IOS Shellcode Presentation

>>Read the advisory a bit closer. Here the relevant lines:
"Products that are not running Cisco IOS are not affected.
Products running any version of Cisco IOS that do not have IPv6
configured interfaces are not vulnerable."

Yes, IOS versions that have the fix, or that don't even run IPv6 are not
*vulnerable*. But all IOS versions are *affected* by the *mechanism* he
described. <<

It's acutally a bit worse than that, IPv6 is enabled on all interfaces,
you have to execute "no ipv6 enable" and "no ipv6 address" command on
each interface to disable it.

Second, the exploit is limited to local network segment, except it seems
to me a worm that spreads from router to router could spread via the
local network since a local network segment is usually defined as the
wire between two routers.. Infection would spread from one router to
it's peers, to those peers, etc. (please correct me if I'm wrong)

Geo.

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