Re: 0-day exploit for Internet Explorer in the wild

[Curt Wilson <curtw () SIU EDU>]

Gregory N Pendergast/AC/VCU wrote:
> BreakingPoint Labs has a good analysis of the exploit:
> http://www.breakingpointsystems.com/community/blog/patch-tuesdays-and-drive-by-sundays
>
> Unfortunately, I haven't yet seen any mention of realistic mitigations.
>
> Greg Pendergast
> Information Security Analyst
> Virginia Commonwealth University

What does 'realistic' mean in this context?

I have not personally tested, however the article mentions manually
enabling DEP for platforms where DEP is opt-in. In the limited attack I
know of so far from the .cn sites, I'm guessing that if the end-stage
binary is not constantly changing or packed with a difficult to handle
packer, AV coverage might be present although again I have not tested.
Of course, that's an after-the-fact and not what you specifically asked
about.

There was a presentation at 2008 BlackHat Las Vegas I believe on
stopping heap spraying attacks, but I'm not sure of the practical
details or implementation.

As far as I can tell, the old standby of "disabling active scripting"
should work. On campus, I recommend people tweak the security zones in
IE, use trusted sites (with active scripting) only when necessary for
internal and/or trusted hosts, disable active scripting elsewhere in IE,
and use another browser for generic web surfing. (firefox + NoScript for
instance). Probably not "realistic" though except for the people that
care enough already.

I am assuming that Vista is not specifically at risk, but I don't know
for a fact. Anyone else know?

Thanks

--
Curt Wilson
SIUC IT Security Officer & Security Engineer