RE: Disclosure of local file content in Mozilla Firefox and Opera

["Giovanni Delvecchio" <badpenguin79 () hotmail com>]

Which you wrote is correct, indeed i have specified in my message:

> Anyway it cannot be exploited "directly" by a remote site, but only if the 
> page is opened from a local path ( file://localpath/code.htm),  since the  
> iframe belongs to a local domain.
>
> Note: with Internet Explorer these PoCs doesn't work even in local.

My target was explain how a remote user could take advantage by this 
feature.
I illustrated also a possible method of remote exploitation.

But at this point i have a question: if it is a normal behavior, why in Ms 
Internet Explorer i cannot reproduce this problem even in local zone?
Maybe different implementation? IMHO it's strange.


Regards,
Giovanni Delvecchio


> This is not a vulnerability, it is expected behavior.
>
> Mozilla shares the same zone design as IE which means that a file from the 
> local file zone can read any other file from the local file zone. You 
> cannot use this approach to read a local file from another zone such as the 
> Internet zone. From the Internet zone, you can also only read the content 
> of files from the same zone, same protocol and same domain.
>
> I agree that Mozilla has implemented quite a lot of proprietary IE 
> extensions which it should have not done, however reading the innerHTML of 
> an element through document.all does not circumvent the traditional zone 
> security checks already in place.
>
>
>
> Regards
>
> Thor Larholm
> Senior Security Researcher
> PivX Solutions
> 23 Corporate Plaza #280
> Newport Beach, CA 92660
> http://www.pivx.com
> thor () pivx com
> Stock symbol: (PIVX.OB)
> Phone: +1 (949) 231-8496
> PGP: 0x4207AEE9
> B5AB D1A4 D4FD 5731 89D6  20CD 5BDB 3D99 4207 AEE9
>
> PivX defines a new genre in Desktop Security: Proactive Threat Mitigation.
> <http://www.pivx.com/qwikfix>

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