TippingPoint Zero Day Initiative

Adobe Shockwave xtcL Chunk Parsing Integer Overflow Remote Code Execution Vulnerability

ZDI-11-203: June 14th, 2011


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11225. For further product information on the TippingPoint IPS:

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 code responsible for parsing xtcL RIFF chunks within Director files. When attempting to allocate dynamic memory for substructures within this object, the code within DIRAPI.dll does not properly validate the size specified within the chunk. By crafting malicious values the process can be made to under-allocate a buffer which is later corrupted by memory copy operations. This can be leveraged by a remote attacker to execute 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

    2011-04-01 - Vulnerability reported to vendor
    2011-06-14 - Coordinated public release of advisory


This vulnerability was discovered by:
    Luigi Auriemma