Internet Information Services Improper Input Validation Vulnerability - CVE-2009-4445

Microsoft Internet Information Services (IIS) when used in conjunction with unspecified third-party upload applications allows remote attackers to create empty files with arbitrary extensions via a filename containing an initial extension followed by a : (colon) and a safe extension as demonstrated by an upload of a .asp:.jpg file that results in creation of an empty .asp file related to support for the NTFS Alternate Data Streams (ADS) filename syntax. NOTE: it could be argued that this is a vulnerability in the third-party product not IIS because the third-party product should be applying its extension restrictions to the portion of the filename before the colon.