Secunia Security Advisory - Soroush Dalili has discovered a vulnerability in Microsoft Internet Information Services, which can be exploited by malicious people to bypass certain security restrictions.
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TITLE:
Microsoft Internet Information Services Basic Authentication Security
Bypass
SECUNIA ADVISORY ID:
SA40412
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RELEASE DATE:
2010-07-02
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DESCRIPTION:
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.
The vulnerability is confirmed in version 5.1 on a fully-patched
Windows XP SP3. Other versions may also be affected.
SOLUTION:
Do not rely on the basic authentication method to restrict access to
resources.
PROVIDED AND/OR DISCOVERED BY:
Soroush Dalili
ORIGINAL ADVISORY:
http://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/
OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/
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