TippingPoint Zero Day Initiative

AOL Products dnUpdater ActiveX Uninitialized Pointer Remote Code Execution Vulnerability

ZDI-12-098: June 21st, 2012

CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 12280. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of America Online's Toolbar, Desktop, IM, and winamp. 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 dnUpdater ActiveX Control. When initializing the ActiveX control object, dnu.exe assumes the 5th argument being used for the Init() method, to be a legitimate pointer to a function. This vulnerability can be leveraged to execute code under the context of the user.

Vendor Response

America Online has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2011-10-21 - Vulnerability reported to vendor
    2012-06-21 - Coordinated public release of advisory


This vulnerability was discovered by:
    Andrea Micalizzi aka rgod