Microsoft .NET Framework contains a cross-site scripting vulnerability

Overview

The Microsoft .NET Framework contains a cross-site scripting vulnerability that may allow an attacker to read or modify data in web pages and cookies.

Description

The Microsoft .NET Framework is a managed code programming model for Microsoft Windows operating systems. Microsoft ASP.NET is a technology designed to allow programmers to create dynamic web sites and web applications.

A cross-site scripting vulnerability exists in the .NET Framework 2.0. This vulnerability occurs due to improper validation of HTTP request values.

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Impact

An attacker may be able to obtain sensitive data from a user of a web site running a vulnerable version of the .NET Framework. Depending on the nature of the web site, this data may include passwords, credit card numbers, and any arbitrary information provided by the user. Likewise, information stored in cookies could be stolen or corrupted.

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Solution

Update
Microsoft has released an update to address this issue. See Microsoft Security Bulletin MS06-056 for more details.

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Workarounds for administrators

According to Microsoft, setting the AutoPostBack property to false may mitigate the affects of this vulnerability. See Microsoft Knowledgebase article 328923 for more information about the AutoPostBack property.

Workarounds for users

* Do not follow untrusted hyperlinks, especially if they are sent through email or instant messenger programs.
* Disable JavaScript. See the [Securing your Web Browser](<http://www.cert.org/tech_tips/securing_browser/>) document for instructions. Note that disabling JavaScript may reduce the functionality and features provided by some web sites.
* TypeURLs directly in the web browser's address bar, or use bookmarks to navigate to web sites.
* See the [Cross-Site Scripting Vulnerabilities](<http://www.cert.org/archive/pdf/cross_site_scripting.pdf>) document for general information.  

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Vendor Information

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Updated: October 10, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see Microsoft Security Bulletin MS06-056.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23455604 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.microsoft.com/technet/security/bulletin/ms06-056.mspx&gt;
• <http://www.cert.org/tech_tips/securing_browser/&gt;

Acknowledgements

Microsoft credits Jaswinder Hayre for reporting this vulnerability.

This document was written by Ryan Giobbi.

Other Information

CVE IDs:	CVE-2006-3436
Severity Metric:	0.96 Date Public: