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Microsoft IIS Inappropriate Cookie Handling Error
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Secunia Advisory:
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SA11563
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Release Date:
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2004-05-10
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Last Update:
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2004-10-21
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Popularity:
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22,210 views
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Critical:
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Not critical
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Impact:
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Exposure of system information
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | Microsoft Internet Information Server (IIS) 4.0
Microsoft Internet Information Services (IIS) 5.x
Microsoft Internet Information Services (IIS) 6
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Description:
Cesar Cerrudo has reported a security issue in Microsoft Internet Information Services (IIS), potentially allowing malicious people to gain knowledge of certain details about server side scripts.
The problem is that IIS fails to properly handle a cookie, which only consists of a "=", leaving the cookie parameter name and value empty. This causes IIS to return an error message when an ASP script attempts to access cookie values.
This has been reported to affect all versions of IIS (Internet Information Services / Internet Information Server).
Solution:
Production systems should always return custom error pages (see Microsoft Knowledge Base article).
Provided and/or discovered by:
Cesar Cerrudo
Changelog:
2004-10-21: Added link to Microsoft Knowledge Base Article and changed status.
Other References:
Microsoft KB Article - "Best practices with custom error pages":
http://support.microsoft.com/?id=834452
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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