Microsoft Internet Information Services (IIS), when used in conjunction with...

Vulnerability Description

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.

References

• http://securitytracker.com/id?1023387
• http://soroush.secproject.com/downloadable/iis-semicolon-report.pdf
• https://exchange.xforce.ibmcloud.com/vulnerabilities/55308