|Date: (C)2009-12-29 (M)2017-08-18|
|CVSS Score: 6.0||Access Vector: NETWORK|
|Exploitability Subscore: 6.8||Access Complexity: MEDIUM|
|Impact Subscore: 6.4||Authentication: SINGLE_INSTANCE|
| ||Confidentiality: PARTIAL|
| ||Integrity: PARTIAL|
| ||Availability: PARTIAL|
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.