TippingPoint Zero Day Initiative

Microsoft Remote Desktop Protocol Channel Abort Condition Remote Code Execution Vulnerability

ZDI-12-044: March 15th, 2012


CVSS Score

Affected Vendors

Affected Products

    Remote Desktop

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 12138. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft's Remote Desktop Protocol. Authentication is not required to exploit this vulnerability.

The specific flaw exists during handling of an error while loading elements into an array. This condition can cause the driver to abort a connection and part of the logic of the abort is to free an object associated with it. This will actually occur twice when each of channels are disconnected. The second time this object is freed, the driver will fetch a virtual pointer from the freed object and call it. This can lead to code execution under the context of the driver.

Vendor Response

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

Disclosure Timeline

    2011-08-24 - Vulnerability reported to vendor
    2012-03-15 - Coordinated public release of advisory


This vulnerability was discovered by:
    Luigi Auriemma