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Microsoft ASP.NET Request Validation Bypass Vulnerability

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Release Date:  2003-09-13    Views:  15,513

Secunia Advisory SA9716

Where:

From remote

Impact:

Security Bypass

Solution Status:

Unpatched

Software:

CVE Reference(s):

No CVE references.

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft ASP.NET Request Validation Bypass Vulnerability

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