full-disclosure - Re: Windows .ANI LoadAniIcon Stack Overflow

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Message-ID: <BEDD0E65713CE64C94A6E83CB2521FD51A9B21@OLCCEX01>
Date: Tue, 10 Apr 2007 10:21:02 -0400
From: "Brooks, Shane" <SBrooks@...ngelake.com>
To: "Michal Majchrowicz" <m.majchrowicz@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Windows .ANI LoadAniIcon Stack Overflow

Do you have a working exploit for this vuln?  The SecFocus page says none is publicly available.

S

-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk [mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Michal Majchrowicz
Sent: Tuesday, April 10, 2007 5:02 AM
To: full-disclosure@...ts.grok.org.uk
Subject: Re: [Full-disclosure] Windows .ANI LoadAniIcon Stack Overflow

Hi.
One thing to add about IE protected mode and all that stuff:
We get shell (in ie protected mode) using ani vulnerability.
Go to the IE temporary directory. It must have write access there :)
Then we use this: http://www.securityfocus.com/bid/23278
And we have SYSTEM access :)
Regards.


On 4/8/07, wac <waldoalvarez00@...il.com> wrote:
> Hello:
>
> Firefox 2.0.0.3 (at least in windows) *seems to be vulnerable*. I don't
> remember exactly what it did but it behaved in a strange way I believe some
> file handle was left open and had to kill it the hard way. I don't know what
> they say in the docs but if it ends up calling the user32 function and
> that's all it takes to trigger the bug. I was taking a peek at it's import
> tables and It imports from User32 the function LoadCursorA maybe that could
> be the guilty one.
>
> anyway test here and see what happens (that link is from dev code)
>
> http://sicotik.com/ink/test.html
>
> I'm not vulnerable anymore since quite some time ;) and I don't have much
> time to test right now
>
> Regards
> Waldo
>
>
> On 4/8/07, Michal Majchrowicz <m.majchrowicz@...il.com> wrote:
> > Hi.
> > There are more and more reports about FF and ani vulnerability.
> > There was already a presentation of working exploit.
> > The thing starts to annoy me and since I am far away from any windows
> > I wanted to share some of my speculations.
> > According to docs two things are obvious:
> > 1) Firefox doesn't support ANI cursors
> > 2) ANI is just few cur cursors packed together and presented as an
> animation.
> > So i have three possible ways of exploiting it:
> > 1) Since ANI files are vulnerable then maybe cur files are also
> > vulnerable. Firefox does support CUR files.
> > 2) If firefox doesn't support ANI files it only means it doesn't
> > render them. It doesn't mean it will not acept them in any way:)
> > 3) Maybe it is possible to rename foo.ani and rename it to foo.cur.
> > Then FF will call win api with this cursor. Windows API will recognize
> > this as ANI file and call vulnerable function .
> > As I said before these are just speculation. I hope someone will be
> > able to confirm or prove that some of them (or all) have no sense.
> > Happy Easter to everyone.
> > Regards Michal.
> >
> > On 4/4/07, Peter Ferrie <pferrie@...antec.com> wrote:
> > > >That's correct, Firefox doesn't support ANI files for cursors.
> > >
> > > Right, and it doesn't need to, because cursors are not the only way to
> reach the vulnerable code.
> > > Icons can do it, too.
> > >
> > >
> > > _______________________________________________
> > > Full-Disclosure - We believe in it.
> > > Charter:
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> > >
> >
> > _______________________________________________
> > Full-Disclosure - We believe in it.
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> >
>
>

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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/