Re: Webkit DoS -- سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ

[Y M <snort () outlook com>]

Sorry for the noise. OSX 10.6.8 and Safari 5.1.6 also does not crash. I do not have access to a newer OSX at the 
moment, but soon I should. Attached is the pcap captured from the OSX 10.6.8.
Thanks.

To: jthoel () gmail com; l0rdch0de1m0rt () gmail com
From: snort () outlook com
Date: Fri, 6 Sep 2013 20:30:58 +0300
CC: snort-sigs () lists sourceforge net
Subject: Re: [Snort-sigs] Webkit DoS -- سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ







Working on a pcap capture right now. On an older mac, with Safari 5.0.6, nothing crashes on me, however I need to 
verify that I meet the vulnerability conditions. I will test on a newer mac.





From:
Jeremy Hoel

Sent:
‎9/‎6/‎2013 8:15 PM

To:
L0rd Ch0de1m0rt

Cc:
Y M;
snort-sigs () lists sourceforge net

Subject:
Re: [Snort-sigs] Webkit DoS -- سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ





On the list of for ET rules, this is also listed as a reference -

http://zhovner.com/tmp/killwebkit.html



On Fri, Sep 6, 2013 at 5:02 PM, L0rd Ch0de1m0rt

<l0rdch0de1m0rt () gmail com> wrote:

> Hello. Y M.  Thank you very much for the input.  Sorry for not including

> this link:

>

>
http://arstechnica.com/apple/2013/08/rendering-bug-crashes-os-x-and-ios-apps-with-string-of-arabic-characters/

>

> It isn't a tool causing this, just a mis-handling by Webkit of this string.

> I am not fully understanding why (probably related more to how the Webkit

> handles the characters/bytes rather than what they actually represents).

>

> I'm not sure if and how the bytes need to be in a certain order.  For

> example:

>

> ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ

>

> ^^ will that cause an issue?

>

> or:

>

> سمَـَّوُوُح

>

> Or does it have to be the full thing:

>

>

> سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ

>

> Thanks.

>

> Lord C.

>

>

> On Fri, Sep 6, 2013 at 12:53 PM, Y M <snort () outlook com> wrote:

> >

> > Can you provide more information on the DOS? What tool is generating this?

> > And against what? Any reference or pcap?

> >

> > The text is in Arabic, though its contains some malformed Arabic

> > characters. The top level characters are used to control pronunciation of

> > words. Again, some of them are malformed. And some of them are wrongly used;

> > if I am reading it write (see below).

> >

> > I am not sure if it is a coincidence, but the word

> > سمَّوُ

> > Means highness; but the top level character in the middle is mistakenly

> > used in the context of the word. The other word:

> > امارتي

> > Means Emirati; translated as an Emirate citizen. Although the word spelled

> > wrong based on the official written Arabic language - I have seen people

> > writing it this way.

> >

> > Some other letters are valid but their construction as a word does not

> > mean anything such و، ح، خ

> >

> > The rest are symbols not used/related to Arabic.

> >

> > Hope this helps. May be if there is more information I can help better.

> >

> > Thanks.

> >

> > ________________________________

> > From: L0rd Ch0de1m0rt

> > Sent: ‎9/‎6/‎2013 7:34 PM

> > To: snort-sigs () lists sourceforge net

> > Subject: Re: [Snort-sigs] Webkit DoS -- سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ

> > امارتيخ ̷̴̐خ

> >

> > Hello.  Whoops, I accidentily sent the last email early (still getting

> > used to the new GMAIL interface and hit the wrong key-board combination for

> > my new key-board layout).  Anyway, here is the string:

> >

> > سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ ̷̴̐خ امارتيخ ̷̴̐خ

> >

> >

> > Does anyone know why this happens and what other combination or

> > sub-strings can be used to exploit this? I ask so that we can make a SNORT

> > rule for it.  From my reading this is DoS and no RCE or BO that is known of.

> >

> > Thanks.

> >

> > Lord C.

> >

> >

> > On Fri, Sep 6, 2013 at 12:27 PM, L0rd Ch0de1m0rt

> > <l0rdch0de1m0rt () gmail com> wrote:

> >

> > Hello.  I saw something recently that showed that this Arabic string can

> > DoS Webkit programs:

> >

> >

>

>

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Attachment: bug.pcap
Description:

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