Soroush Dalili has discovered a vulnerability in Microsoft Internet Information Services, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error in the handling of basic authentication for directories. This can be exploited to bypass authentication and access e.g. protected directories by appending the NTFS stream name and stream type (":$i30:$INDEX_ALLOCATION") to the directory name within a request.
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Subject: Microsoft Internet Information Services Basic Authentication Security Bypass