RE: [Full-Disclosure] Blaster: will it spread without tftp?

["Paul J." <pj7@hushmail.com>]

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>  Yes we are now investigating how we can speed up patch deployment
;-)

This should be tempered with a tad of investigation into patch BACKOUT.
 One day a virus/worm/bot will come, people will rush to patch, and the
patch actually feed the virus/worm/bot like shit feeds a stink.    I
am impressed with the moderate lack of such ability in many of the "patch"
download/install scenarios.
7



- -----Original Message-----
From: Russell Fulton [mailto:r.fulton@auckland.ac.nz]
Sent: Wednesday, August 13, 2003 12:17 AM
To: nick@virus-l.demon.co.uk
Cc: full-disclosure@lists.netsys.com
Subject: Re: [Full-Disclosure] Blaster: will it spread without tftp?


On Wed, 2003-08-13 at 14:13, Nick FitzGerald wrote:
> "Maarten" <subscriptions@hartsuijker.com> wrote:
>
> > I was wondering about the following scenario:
> <<snip>>
> > - since these other vulnerable systems are using a proxy server to
connect
> > to the internet and a firewall prevents all other connections, tftp
servers
> > on the Internet can not be accessed
>
> Good up to here, but then...
>
> > - since tftp servers can not be accessed, msblaster.exe can not be
> > downloaded
>
> No.
>
> When the worm connects from its current victim to a new, vulnerable

> host it tells the new victim to TFTP the worm's .EXE from the current

> victim machine where the worm briefly sets up a TFTP thread to serve

> its .EXE.

I can confirm this.  We block tftp at the gateway (as well as all the
MS
ports 135-139, 445 etc.).  An infected laptop was brought on to the
internal network and half an hour later we had 500 infected systems and
a very soggy network.

Note, that those 500 was out of a total of 7500, we had managed to get
the rest patched, another week and we would have only had a handful.

Yes we are now investigating how we can speed up patch deployment ;-)

- --
Russell Fulton, Network Security Officer, The University of Auckland,

New Zealand.

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