The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1 Visual Studio 2005 SP1 and 2008 Gold and SP1 and Visual C++ 2005 SP1 and 2008 Gold and SP1 does not properly enforce string termination which allows remote attackers to obtain sensitive information via a crafted HTML document with an ATL (1) component or (2) control that triggers a buffer over-read related to ATL headers and buffer allocation aka \ATL Null String Vulnerability.\