ZDI-11-207: Adobe Shockwave tSAC Chunk String Termination Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-207

June 14, 2011

-- CVE ID:
CVE-2011-2118

-- CVSS:
7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)

-- Affected Vendors:
Adobe

-- Affected Products:
Adobe Shockwave Player

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11369. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of the Adobe Shockwave Player. User interaction
is required to exploit this vulnerability in that the target must visit
a malicious page or open a malicious file.

The specific flaw exists within the support for embedding various file
types within the RIFF-based Director file format. Several of the asset
modules distributed with Shockwave do not properly extract string values
from within embedded media objects. The code attempts to null-terminate
such strings using a 32-bit size value specified prior to the string
value. By crafting an embedded media object with a large string size an
attacker can write a NULL byte to a controlled offset from the buffer
containing the string. This can be leveraged to execute arbitrary code
under the context of the user running the browser.

-- Vendor Response:
Adobe has issued an update to correct this vulnerability. More
details can be found at:

http://www.adobe.com/support/security/bulletins/apsb11-17.html

-- Disclosure Timeline:
2011-04-11 - Vulnerability reported to vendor
2011-06-14 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Donato Ferrante
    * Luigi Auriemma

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