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Microsoft ASP.NET Request Validation Bypass Vulnerability
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Secunia Advisory:
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SA9716
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Release Date:
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2003-09-13
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Popularity:
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9,895 views
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Critical:
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Less critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Unpatched
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| Software: | ASP.NET 1.x
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Description:
A vulnerability has been reported in ASP.NET, which can be exploited by malicous people to bypass the "Request Validation" security mechanism.
The "Request Validation" mechanism designed to protect against Cross-Site Scripting and SQL injection allows restricted tags when they include a NULL byte. However, this is a problem since some browsers (eg. Internet Explorer) ignore NULL bytes when parsing input, which may cause them to execute the content in the tags anyway.
Example:
<%00SCRIPT>alert(document.cookie)</SCRIPT>
The vulnerability has been reported in the ASP.Net 1.1 framework.
Solution:
Don't rely on this security mechanism to protect against Cross-Site Scripting and SQL injection attacks. Make sure that proper input validation is built into web applications.
Provided and/or discovered by:
WebCohort Research
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About this Secunia Advisory
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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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