TippingPoint Digital Vaccine Laboratories
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Adobe Shockwave Font Xtra String Decoding Remote Code Execution Vulnerability

TPTI-11-03: February 8th, 2011


Affected Vendors

Affected Products

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 Font Xtra.x32 asset module responsible for parsing font structures within Director movie files (.dir). When parsing data within the PFR1 chunk, the process implicitly sign-extends a 16-bit size value and seeks pointers accordingly. It then operates upon the data it has reached which can be abused by an attacker to corrupt memory and subsequently 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:

Disclosure Timeline

    2010-12-16 - Vulnerability reported to vendor
    2011-02-08 - Coordinated public release of advisory


This vulnerability was discovered by: