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asp.net viewstat Tampering Vulnerabilities

Trustwave's SpiderLabs Security Advisory TWSL2010-001:
Multiplatform View State Tampering Vulnerabilities
Published: 2010-02-08 Version: 1.1
SpiderLabs has documented view state tampering
vulnerabilities in three products from separate vendors.
View states are used by some web application frameworks to
store the state of HTML GUI controls. View states are
typically stored in hidden client-side input fields,
although server-side storage is widely supported.
The affected vendors generally recommend that client-side
view states are cryptographically signed and/or encrypted,
but specific exploits have not been previously documented.
These vulnerabilities show that unsigned client-side view
states will ALWAYS result in a vulnerability in the affected
products.
Credit: David Byrne of Trustwave's SpiderLabs
===============================================
Vendor: Microsoft (http://www.microsoft.com)
Product: ASP.Net (http://www.asp.net)
Versions affected: .Net 3.5 is confirm ......
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