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Vigil@nce: Microsoft ASP.NET, Cross Site Scripting via ViewState

February 2010 by Vigil@nce

When ViewState are not signed by Microsoft ASP.NET, an attacker
can generate a Cross Site Scripting.

 Severity: 2/4
 Consequences: client access/rights
 Provenance: document
 Means of attack: no proof of concept, no attack
 Ability of attacker: expert (4/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 10/02/2010

IMPACTED PRODUCTS

 Microsoft .NET Framework

DESCRIPTION OF THE VULNERABILITY

An ASP page can use a hidden variable named __VIEWSTATE,
containing the state of a form, encoded in base64.

Some applications directly display data from the ViewState on the
web page returned to the client, without filtering them to ensure
they do not contain JavaScript code. In this case, and if the
ViewState is not signed, an attacker can therefore encode a
malicious script in base64, and then send it in the __VIEWSTATE
variable.

When ViewState are not signed by Microsoft ASP.NET, an attacker
can therefore generate a Cross Site Scripting.

CHARACTERISTICS

 Identifiers: TWSL2010-001, VIGILANCE-VUL-9439
 Url: http://vigilance.fr/vulnerability/Microsoft-ASP-NET-Cross-Site-Scripting-via-ViewState-9439


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