RE: about that new MySpace XSS worm

["Debasis Mohanty" <mail () hackingspirits com>]

> > In other words, the "worm" creates a link to the malicious flash file in
your MySpace profile. 
> > Whenever someone views your profile with a vulnerable version of Flash
they become infected and the "worm" grows.
 
Exactly !! This is what seems to be the reason behind the worm propagation.
Thats why I mentioned the use of 'XSS' in the blog is highly misleading...
 
- T



  _____  

From: Kevin Pawloski [mailto:kpawloski () gmail com] 
Sent: Tuesday, December 20, 2005 1:31 AM
To: Debasis Mohanty
Cc: full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] about that new MySpace XSS worm



A worm propagating through MySpace using a malicious flash file has been
going on for awhile now. There was one back in the end of October where
viewing a malicious Flash file changed your default picture to our main man
Ali G. A few days later, Symantec issued a security bulletin for
vulnerabilities in Flash versions 6.X and 7.X. (See BugtraqID 15332) 

In other words, the "worm" creates a link to the malicious flash file in
your MySpace profile. Whenever someone views your profile with a vulnerable
version of Flash they become infected and the "worm" grows.

Kevin


On 12/19/05, Debasis Mohanty <mail () hackingspirits com> wrote: 

Hi,
I read your blog. Find my comments inline -

----- Original Message -----
From: "Xavier" <compromise () gmail com>
To: <  <mailto:full-disclosure () lists grok org uk>
full-disclosure () lists grok org uk>
Sent: Sunday, December 18, 2005 8:19 AM
Subject: [Full-disclosure] about that new MySpace XSS worm

> > 1) There is a XSS vulnerability in MySpace.com, in the form of an 
> > unsanitized vulnerability in the variable name "TheName".

<No Comments Here>

> > 2) The XSS worm is propagating via malicious .swf Flash files,
> > using ActionScript and Cross-Domain data loading. 

I failed to understand, how it manage to _self-propagate_ via .swf file??
Can you elaborate here???

If your answer is XSS, then it implies it is not self propagating worm and
involves some sort of social engineering to entice the victim to click on 
the malicious link. If the answer is not XSS, then I guess the use of XSS in
the blog is highly misleading.


> > 3) Thanks to the XSS, and http://www.myspace.com/crossdomain.xml
<http://www.myspace.com/crossdomain.xml> (note
> > specifically: allow-access-from domain="*"/) the worm hit many users
> > across MySpace.

Although, I can see the url with possible XSS in your blog but it is unclear
to me where and how it has been used.. The major player which I can see here

is "xmlhttp". The first version of samy worm actually demonstrate the real
power of xmlhttp in the malicious form. The interesting part of the worm
was, the way xmlhttp was used to send request to cross-domain and the use of

'eval' to bypass all those script / tags parsing mechanism.

- T (aka D)

Ps: A mix of xmlhttp + AJAX + RSS => Creats really cool web based
self-propagating worms which makes millions of sites using rss 
vulnerable.... More to come ...


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