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TUCoPS :: Macintosh :: b06-2158.htm

Apple QuickTime udta ATOM Heap Overflow



Apple QuickTime udta ATOM Heap Overflow
Apple QuickTime udta ATOM Heap Overflow



Apple QuickTime udta ATOM Heap Overflow


By Sowhat of Nevis Labs
Date: 2006.05.12

http://www.nevisnetworks.com 
http://secway.org/advisory/AD20060512.txt 


Vendor:
Apple Inc.


Affected Versions:
Apple QuickTime versions < 7.1


Overview:
We have discovered a critical vulnerability in Quicktime Player.
The vulnerability allows an attacker to  execute arbitrary code
in the context of the user who executes QuickTime.

This vulnerability can be exploited By persuading a user to open
a carefully crafted .mov files or visit a website embedding the
malicious .mov file.


Details:
This vulnerability exists in the way Quicktime process the "udta" Atom of
the .mov files.

The layout of a udta(user data atom) atom:

                           Bytes
   _______________________=09=09=09=09=09=09=09=09=09=09=09
  |    User data atom     |
  |     Atom size         | 4
  |    Type = 'udta'      | 4
  |                       |
  |   User data list      |
  |     Atom size         | 4
  | Type = user data types| 4
  |                       |
   -----------------------



By setting the value of the Atom size to a large value such as 0xFFFFFFFF,
an insufficiently-sized heap block will be allocated, and resulting in a
classic complete heap memory overwrite during the RtlAllocateHeap() function.




Vendor Response:

2006.05.06=09Vendor notified via product-security@apple.com 
2006.05.07=09Vendor responded
2006.05.09=09Vendor ask for more information
2006.05.11=09Vendor released QuickTime 7.1
2006.05.12=09Advisory released


Vendor was contacted in 05/06/2006, and they said:
"This message is being sent to you by a security analyst who has reviewed
your note.  The issue is being  investigated, and we appreciate the time
you have taken to report it to us. "

This vulnerability no longer exists in their new release(7.1),
However the vendor didnt formally inform me about the patch.


Greetings to Ajit, Chi, Xin, Linlin and all guys in India & US Nevis Labs


Reference:
1. http://developer.apple.com/documentation/QuickTime/QTFF/index.html 
2. http://docs.info.apple.com/article.html?artnum=303752 





-- 
Sowhat
http://secway.org 
"Life is like a bug, Do you know how to exploit it ?"


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