On 3 Jan 2006 at 9:56, Stephen Bird wrote:

> On Tue, 3 Jan 2006 09:39:32 -0500, Bernie Cosell wrote:
> 
> >Correct -- there's no way to know where tinyurl is going to take you 
> >until after you get there, which might be too late.
> 
> Thanks, Bernie.... and a firewall wouldn't protect the visitor from an 
> infection?

By and large, that's correct.  The file the comes over looks 100% legit, 
and as been pointed out, can masquerade as a .jpg image, and so it would 
come in just like every other image on every other web page you visit.

> My understanding is that infection can also occur from attachments and that AV
> programs are just being developed to identify/protect users.

Correct: *ANY means by which you render a graphics image can potentially 
go hit the problem in the gdi library.  BUT: so far, the AV folk are 
*NOT* winning.  This vulnerability can be completely masked and varied, 
and as fast as they come up with definitions to catch yesterday's 
versions, there are a dozen new variants they can't catch.

> .. I wonder where the
> greatest risks lies - visits to web sites which have been 
> designed/inadvertently
> take advantage of the wmf vulnerability or by the transmission/exchange of 
> infected
> attachments.

Well, probably the visit to web sites: email attachments are completely 
inert and *always* require your active intervention before they can do 
anything.  So simply being careful [which you should've been doing all 
along!!!] will be OK for email attachments.   You have essentially no 
conrol over what your browser does: once you have it open a site, it'll 
do redirects, grab images, etc all automatically, and there's no way to 
tell *before* that happens that it is about to [unlike with email, where 
it waits for you to infect yourself].

  /Bernie\

-- 
Bernie Cosell                     Fantasy Farm Fibers
mailto:[EMAIL PROTECTED]     Pearisburg, VA
    -->  Too many people, too few sheep  <--       

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