The Authenticode Signature Verification function in Microsoft Windows XP SP2 and SP3 Windows Server 2003 SP2 Windows Vista SP2 Windows Server 2008 SP2 R2 and R2 SP1 Windows 7 Gold and SP1 and Windows 8 Consumer Preview does not properly validate the digest of a signed portable executable (PE) file which allows user-assisted remote attackers to execute arbitrary code via a modified file with additional content aka \WinVerifyTrust Signature Validation Vulnerability.\